- 21 Jul, 2015 40 commits
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Rafael J. Wysocki authored
commit 08249651 upstream. Refine the mechanism introduced by commit f244d8b6 ("ACPIPHP / radeon / nouveau: Fix VGA switcheroo problem related to hotplug") to propagate the ignore_hotplug setting of the device to its parent bridge in case hotplug notifications related to the graphics adapter switching are given for the bridge rather than for the device itself (they need to be ignored in both cases). Link: https://bugzilla.kernel.org/show_bug.cgi?id=61891 Link: https://bugs.freedesktop.org/show_bug.cgi?id=88927 Fixes: b440bde7 ("PCI: Add pci_ignore_hotplug() to ignore hotplug events for a device") Reported-and-tested-by:
tiagdtd-lava <tiagdtd-lava@yahoo.de> Signed-off-by:
Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by:
Bjorn Helgaas <bhelgaas@google.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Uwe Kleine-König authored
commit e5babdf9 upstream. Since commit bd31b859 (which is in 3.2-rc1) nw_gpio_lock is a raw spinlock that needs usage of the corresponding raw functions. This fixes: drivers/mtd/maps/dc21285.c: In function 'nw_en_write': drivers/mtd/maps/dc21285.c:41:340: warning: passing argument 1 of 'spinlock_check' from incompatible pointer type spin_lock_irqsave(&nw_gpio_lock, flags); In file included from include/linux/seqlock.h:35:0, from include/linux/time.h:5, from include/linux/stat.h:18, from include/linux/module.h:10, from drivers/mtd/maps/dc21285.c:8: include/linux/spinlock.h:299:102: note: expected 'struct spinlock_t *' but argument is of type 'struct raw_spinlock_t *' static inline raw_spinlock_t *spinlock_check(spinlock_t *lock) ^ drivers/mtd/maps/dc21285.c:43:25: warning: passing argument 1 of 'spin_unlock_irqrestore' from incompatible pointer type spin_unlock_irqrestore(&nw_gpio_lock, flags); ^ In file included from include/linux/seqlock.h:35:0, from include/linux/time.h:5, from include/linux/stat.h:18, from include/linux/module.h:10, from drivers/mtd/maps/dc21285.c:8: include/linux/spinlock.h:370:91: note: expected 'struct spinlock_t *' but argument is of type 'struct raw_spinlock_t *' static inline void spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags) Fixes: bd31b859 ("locking, ARM: Annotate low level hw locks as raw") Signed-off-by:
Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by:
Brian Norris <computersforpeace@gmail.com> Signed-off-by:
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Brian Norris authored
commit 073db4a5 upstream. On A MIPS 32-cores machine a BUG_ON was triggered because some acesses to mtd->usecount were done without taking mtd_table_mutex. kernel: Call Trace: kernel: [<ffffffff80401818>] __put_mtd_device+0x20/0x50 kernel: [<ffffffff804086f4>] blktrans_release+0x8c/0xd8 kernel: [<ffffffff802577e0>] __blkdev_put+0x1a8/0x200 kernel: [<ffffffff802579a4>] blkdev_close+0x1c/0x30 kernel: [<ffffffff8022006c>] __fput+0xac/0x250 kernel: [<ffffffff80171208>] task_work_run+0xd8/0x120 kernel: [<ffffffff8012c23c>] work_notifysig+0x10/0x18 kernel: kernel: Code: 2442ffff ac8202d8 000217fe <00020336> dc820128 10400003 00000000 0040f809 00000000 kernel: ---[ end trace 080fbb4579b47a73 ]--- Fixed by taking the mutex in blktrans_open and blktrans_release. Note that this locking is already suggested in include/linux/mtd/blktrans.h: struct mtd_blktrans_ops { ... /* Called with mtd_table_mutex held; no race with add/remove */ int (*open)(struct mtd_blktrans_dev *dev); void (*release)(struct mtd_blktrans_dev *dev); ... }; But we weren't following it. Originally reported by (and patched by) Zhang and Giuseppe, independently. Improved and rewritten. Reported-by:
Zhang Xingcai <zhangxingcai@huawei.com> Reported-by:
Giuseppe Cantavenera <giuseppe.cantavenera.ext@nokia.com> Tested-by:
Alexander Sverdlin <alexander.sverdlin@nokia.com> Signed-off-by:
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Grygorii Strashko authored
commit 084609bf upstream. Setting a dev_pm_ops suspend/resume pair of callbacks but not a set of hibernation callbacks means those pm functions will not be called upon hibernation - that leads to system crash on ARM during freezing if gpio-led is used in combination with CPU led trigger. It may happen after freeze_noirq stage (GPIO is suspended) and before syscore_suspend stage (CPU led trigger is suspended) - usually when disable_nonboot_cpus() is called. Log: PM: noirq freeze of devices complete after 1.425 msecs Disabling non-boot CPUs ... ^ system may crash or stuck here with message (TI AM572x) WARNING: CPU: 0 PID: 3100 at drivers/bus/omap_l3_noc.c:148 l3_interrupt_handler+0x22c/0x370() 44000000.ocp:L3 Custom Error: MASTER MPU TARGET L4_PER1_P3 (Idle): Data Access in Supervisor mode during Functional access CPU1: shutdown ^ or here Fix this by using SIMPLE_DEV_PM_OPS, which appropriately assigns the suspend and hibernation callbacks and move led_suspend/led_resume under CONFIG_PM_SLEEP to avoid build warnings. Fixes: 73e1ab41 (leds: Convert led class driver from legacy pm ops to dev_pm_ops) Signed-off-by:
Grygorii Strashko <Grygorii.Strashko@linaro.org> Acked-by:
Jacek Anaszewski <j.anaszewski@samsung.com> Signed-off-by:
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Liu Ying authored
commit 2fa3b4c4 upstream. The LCDIF engines embedded in i.MX6sl and i.MX6sx SoCs need the axi clock as the engine's system clock. The clock should be enabled when accessing LCDIF registers, otherwise the kernel would hang up. We should also keep the clock enabled when the engine is being active to scan out frames from memory. This patch makes sure the axi clock is enabled when accessing registers so that the kernel hang up issue can be fixed. Reported-by:
Peter Chen <peter.chen@freescale.com> Tested-by:
Liu Ying <Ying.Liu@freescale.com> Signed-off-by:
Tomi Valkeinen <tomi.valkeinen@ti.com> Signed-off-by:
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Axel Lin authored
commit 63781394 upstream. request_any_context_irq() returns a negative value on failure. It returns either IRQC_IS_HARDIRQ or IRQC_IS_NESTED on success. So fix testing return value of request_any_context_irq(). Also fixup the return value of devm_request_any_context_irq() to make it consistent with request_any_context_irq(). Fixes: 0668d306 ("genirq: Add devm_request_any_context_irq()") Signed-off-by:
Axel Lin <axel.lin@ingics.com> Reviewed-by:
Stephen Boyd <sboyd@codeaurora.org> Link: http://lkml.kernel.org/r/1431334978.17783.4.camel@ingics.comSigned-off-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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Bart Van Assche authored
commit a44074f1 upstream. Although it is possible to let SRP I/O continue if a reconnect results in a reduction of the number of channels, the current code does not handle this scenario correctly. Instead of making the reconnect code more complex, consider this as a reconnection failure. Signed-off-by:
Bart Van Assche <bart.vanassche@sandisk.com> Cc: Sagi Grimberg <sagig@mellanox.com> Cc: Sebastian Parschauer <sebastian.riemer@profitbricks.com> Signed-off-by:
Doug Ledford <dledford@redhat.com> Signed-off-by:
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Bart Van Assche authored
commit c014c8cd upstream. Reception of a DREQ message only causes the state of a single channel to change. Hence move the 'connected' member variable from the target to the channel data structure. This patch avoids that following false positive warning can be reported by srp_destroy_qp(): WARNING: at drivers/infiniband/ulp/srp/ib_srp.c:617 srp_destroy_qp+0xa6/0x120 [ib_srp]() Call Trace: [<ffffffff8106e10f>] warn_slowpath_common+0x7f/0xc0 [<ffffffff8106e16a>] warn_slowpath_null+0x1a/0x20 [<ffffffffa0440226>] srp_destroy_qp+0xa6/0x120 [ib_srp] [<ffffffffa0440322>] srp_free_ch_ib+0x82/0x1e0 [ib_srp] [<ffffffffa044408b>] srp_create_target+0x7ab/0x998 [ib_srp] [<ffffffff81346f60>] dev_attr_store+0x20/0x30 [<ffffffff811dd90f>] sysfs_write_file+0xef/0x170 [<ffffffff8116d248>] vfs_write+0xc8/0x190 [<ffffffff8116d411>] sys_write+0x51/0x90 Signed-off-by:
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Bart Van Assche authored
commit 8de9fe3a upstream. Avoid that receiving a DREQ while RDMA channels are being established causes target->qp_in_error to be reset. Signed-off-by:
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Bart Van Assche authored
commit fb49c8bb upstream. Fix a scsi_get_host() / scsi_host_put() imbalance in the error path of srp_create_target(). See also patch "IB/srp: Avoid that I/O hangs due to a cable pull during LUN scanning" (commit ID 34aa654e). Signed-off-by:
Sagi Grimberg <sagig@mellanox.com> Cc: Sebastian Parschauer <sebastian.riemer@profitbricks.com> Signed-off-by:
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Bart Van Assche authored
commit 535fb906 upstream. Avoid that srp_terminate_io() can get invoked while srp_queuecommand() is in progress. This patch avoids that an I/O timeout can trigger the following kernel warning: WARNING: at drivers/infiniband/ulp/srp/ib_srp.c:1447 srp_terminate_io+0xef/0x100 [ib_srp]() Call Trace: [<ffffffff814c65a2>] dump_stack+0x4e/0x68 [<ffffffff81051f71>] warn_slowpath_common+0x81/0xa0 [<ffffffff8105204a>] warn_slowpath_null+0x1a/0x20 [<ffffffffa075f51f>] srp_terminate_io+0xef/0x100 [ib_srp] [<ffffffffa07495da>] __rport_fail_io_fast+0xba/0xc0 [scsi_transport_srp] [<ffffffffa0749a90>] rport_fast_io_fail_timedout+0xe0/0xf0 [scsi_transport_srp] [<ffffffff8106e09b>] process_one_work+0x1db/0x780 [<ffffffff8106e75b>] worker_thread+0x11b/0x450 [<ffffffff81073c64>] kthread+0xe4/0x100 [<ffffffff814cf26c>] ret_from_fork+0x7c/0xb0 See also patch "scsi_transport_srp: Add transport layer error handling" (commit ID 29c17324). Signed-off-by:
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Bart Van Assche authored
commit be34c62d upstream. Introduce the helper function srp_wait_for_queuecommand(). Move the definition of scsi_request_fn_active(). Add a comment above srp_wait_for_queuecommand() that support for scsi-mq needs to be added. This patch does not change any functionality. A second call to srp_wait_for_queuecommand() will be introduced in the next patch. Signed-off-by:
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Ezequiel Garcia authored
commit ea6055c4 upstream. Since commit 39a6ac11 ("spi/pl022: Devicetree support w/o platform data") the 'num-cs' parameter cannot be passed through platform data when probing with devicetree. Instead, it's a required devicetree property. Fix the binding documentation so the property is properly specified. Fixes: 39a6ac11 ("spi/pl022: Devicetree support w/o platform data") Signed-off-by:
Ezequiel Garcia <ezequiel@vanguardiasur.com.ar> Signed-off-by:
Mark Brown <broonie@kernel.org> Signed-off-by:
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Gregory CLEMENT authored
commit ce2f6ea1 upstream. The commit df59fa7f "spi: orion: support armada extended baud rates" was too optimistic for the maximum baud rate that the Armada SoCs can support. According to the hardware datasheet the maximum frequency supported by the Armada 370 SoC is tclk/4. But for the Armada XP, Armada 38x and Armada 39x SoCs the limitation is 50MHz and for the Armada 375 it is tclk/15. Currently the armada-370-spi compatible is only used by the Armada 370 and the Armada XP device tree. On Armada 370, tclk cannot be higher than 200MHz. In order to be able to handle both SoCs, we can take the minimum of 50MHz and tclk/4. A proper solution is adding a compatible string for each SoC, but it can't be done as a fix for compatibility reason (we can't modify device tree that have been already released) and it will be part of a separate patch. Fixes: df59fa7f (spi: orion: support armada extended baud rates) Reported-by:
Kostya Porotchkin <kostap@marvell.com> Signed-off-by:
Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by:
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Martin Sperl authored
commit 8e76ef88 upstream. Fix a race (with some kernel configurations) where a queued master->pump_messages runs and frees dummy_tx/rx before spi_unmap_msg is running (or is finished). This results in the following messages: BUG: Bad page state in process page:db7ba030 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x200(arch_1) page dumped because: PAGE_FLAGS_CHECK_AT_PREP flag set ... Reported-by:
Noralf Trønnes <noralf@tronnes.org> Suggested-by:
Martin Sperl <kernel@martin.sperl.org> Signed-off-by:
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Miroslav Benes authored
commit 9a1bd63c upstream. The list of loaded modules is walked through in module_kallsyms_on_each_symbol (called by kallsyms_on_each_symbol). The module_mutex lock should be acquired to prevent potential corruptions in the list. This was uncovered with new lockdep asserts in module code introduced by the commit 0be964be ("module: Sanitize RCU usage and locking") in recent next- trees. Signed-off-by:
Miroslav Benes <mbenes@suse.cz> Acked-by:
Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by:
Jiri Kosina <jkosina@suse.cz> Signed-off-by:
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Stefan Wahren authored
commit a7068e39 upstream. The buffer for condtraints debug isn't big enough to hold the output in all cases. So fix this issue by increasing the buffer. Signed-off-by:
Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by:
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Joe Perches authored
commit c53403a3 upstream. The code should handle more than 32 bits here because "id" can be a value up to MAX77686_REGULATORS (currently 34). Convert the gpio_enabled type to DECLARE_BITMAP and use test_bit/set_bit. Fixes: 3307e902 ("regulator: max77686: Add GPIO control") Reported-by:
Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by:
Joe Perches <joe@perches.com> Reviewed-by:
Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by:
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Maxime Coquelin authored
commit 921cc294 upstream. The way the mask is generated in regmap_field_init() is wrong. Indeed, a field initialized with msb = 31 and lsb = 0 provokes a shift overflow while calculating the mask field. On some 32 bits architectures, such as x86, the generated mask is 0, instead of the expected 0xffffffff. This patch uses GENMASK() to fix the problem, as this macro is already safe regarding shift overflow. Signed-off-by:
Maxime Coquelin <maxime.coquelin@st.com> Signed-off-by:
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Arun Chandran authored
commit 15b8d2c4 upstream. In big endian mode regmap_bulk_read gives incorrect data for byte reads. This is because memcpy of a single byte from an address after full word read gives different results when endianness differs. ie. we get little-end in LE and big-end in BE. Signed-off-by:
Arun Chandran <achandran@mvista.com> Signed-off-by:
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Vlastimil Babka authored
commit 0867a57c upstream. Since commit 077fcf11 ("mm/thp: allocate transparent hugepages on local node"), we handle THP allocations on page fault in a special way - for non-interleave memory policies, the allocation is only attempted on the node local to the current CPU, if the policy's nodemask allows the node. This is motivated by the assumption that THP benefits cannot offset the cost of remote accesses, so it's better to fallback to base pages on the local node (which might still be available, while huge pages are not due to fragmentation) than to allocate huge pages on a remote node. The nodemask check prevents us from violating e.g. MPOL_BIND policies where the local node is not among the allowed nodes. However, the current implementation can still give surprising results for the MPOL_PREFERRED policy when the preferred node is different than the current CPU's local node. In such case we should honor the preferred node and not use the local node, which is what this patch does. If hugepage allocation on the preferred node fails, we fall back to base pages and don't try other nodes, with the same motivation as is done for the local node hugepage allocations. The patch also moves the MPOL_INTERLEAVE check around to simplify the hugepage specific test. The difference can be demonstrated using in-tree transhuge-stress test on the following 2-node machine where half memory on one node was occupied to show the difference. > numactl --hardware available: 2 nodes (0-1) node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 24 25 26 27 28 29 30 31 32 33 34 35 node 0 size: 7878 MB node 0 free: 3623 MB node 1 cpus: 12 13 14 15 16 17 18 19 20 21 22 23 36 37 38 39 40 41 42 43 44 45 46 47 node 1 size: 8045 MB node 1 free: 7818 MB node distances: node 0 1 0: 10 21 1: 21 10 Before the patch: > numactl -p0 -C0 ./transhuge-stress transhuge-stress: 2.197 s/loop, 0.276 ms/page, 7249.168 MiB/s 7962 succeed, 0 failed, 1786 different pages > numactl -p0 -C12 ./transhuge-stress transhuge-stress: 2.962 s/loop, 0.372 ms/page, 5376.172 MiB/s 7962 succeed, 0 failed, 3873 different pages Number of successful THP allocations corresponds to free memory on node 0 in the first case and node 1 in the second case, i.e. -p parameter is ignored and cpu binding "wins". After the patch: > numactl -p0 -C0 ./transhuge-stress transhuge-stress: 2.183 s/loop, 0.274 ms/page, 7295.516 MiB/s 7962 succeed, 0 failed, 1760 different pages > numactl -p0 -C12 ./transhuge-stress transhuge-stress: 2.878 s/loop, 0.361 ms/page, 5533.638 MiB/s 7962 succeed, 0 failed, 1750 different pages > numactl -p1 -C0 ./transhuge-stress transhuge-stress: 4.628 s/loop, 0.581 ms/page, 3440.893 MiB/s 7962 succeed, 0 failed, 3918 different pages The -p parameter is respected regardless of cpu binding. > numactl -C0 ./transhuge-stress transhuge-stress: 2.202 s/loop, 0.277 ms/page, 7230.003 MiB/s 7962 succeed, 0 failed, 1750 different pages > numactl -C12 ./transhuge-stress transhuge-stress: 3.020 s/loop, 0.379 ms/page, 5273.324 MiB/s 7962 succeed, 0 failed, 3916 different pages Without -p parameter, hugepage restriction to CPU-local node works as before. Fixes: 077fcf11 ("mm/thp: allocate transparent hugepages on local node") Signed-off-by:
Vlastimil Babka <vbabka@suse.cz> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by:
David Rientjes <rientjes@google.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Michal Hocko <mhocko@suse.cz> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
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Larry Finger authored
commit 8a8c35fa upstream. Beginning at commit d52d3997 ("ipv6: Create percpu rt6_info"), the following INFO splat is logged: =============================== [ INFO: suspicious RCU usage. ] 4.1.0-rc7-next-20150612 #1 Not tainted ------------------------------- kernel/sched/core.c:7318 Illegal context switch in RCU-bh read-side critical section! other info that might help us debug this: rcu_scheduler_active = 1, debug_locks = 0 3 locks held by systemd/1: #0: (rtnl_mutex){+.+.+.}, at: [<ffffffff815f0c8f>] rtnetlink_rcv+0x1f/0x40 #1: (rcu_read_lock_bh){......}, at: [<ffffffff816a34e2>] ipv6_add_addr+0x62/0x540 #2: (addrconf_hash_lock){+...+.}, at: [<ffffffff816a3604>] ipv6_add_addr+0x184/0x540 stack backtrace: CPU: 0 PID: 1 Comm: systemd Not tainted 4.1.0-rc7-next-20150612 #1 Hardware name: TOSHIBA TECRA A50-A/TECRA A50-A, BIOS Version 4.20 04/17/2014 Call Trace: dump_stack+0x4c/0x6e lockdep_rcu_suspicious+0xe7/0x120 ___might_sleep+0x1d5/0x1f0 __might_sleep+0x4d/0x90 kmem_cache_alloc+0x47/0x250 create_object+0x39/0x2e0 kmemleak_alloc_percpu+0x61/0xe0 pcpu_alloc+0x370/0x630 Additional backtrace lines are truncated. In addition, the above splat is followed by several "BUG: sleeping function called from invalid context at mm/slub.c:1268" outputs. As suggested by Martin KaFai Lau, these are the clue to the fix. Routine kmemleak_alloc_percpu() always uses GFP_KERNEL for its allocations, whereas it should follow the gfp from its callers. Reviewed-by:
Catalin Marinas <catalin.marinas@arm.com> Reviewed-by:
Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> Acked-by:
Martin KaFai Lau <kafai@fb.com> Signed-off-by:
Larry Finger <Larry.Finger@lwfinger.net> Cc: Martin KaFai Lau <kafai@fb.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Tejun Heo <tj@kernel.org> Cc: Christoph Lameter <cl@linux-foundation.org> Signed-off-by:
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Catalin Marinas authored
commit c5f3b1a5 upstream. The kmemleak scanning thread can run for minutes. Callbacks like kmemleak_free() are allowed during this time, the race being taken care of by the object->lock spinlock. Such lock also prevents a memory block from being freed or unmapped while it is being scanned by blocking the kmemleak_free() -> ... -> __delete_object() function until the lock is released in scan_object(). When a kmemleak error occurs (e.g. it fails to allocate its metadata), kmemleak_enabled is set and __delete_object() is no longer called on freed objects. If kmemleak_scan is running at the same time, kmemleak_free() no longer waits for the object scanning to complete, allowing the corresponding memory block to be freed or unmapped (in the case of vfree()). This leads to kmemleak_scan potentially triggering a page fault. This patch separates the kmemleak_free() enabling/disabling from the overall kmemleak_enabled nob so that we can defer the disabling of the object freeing tracking until the scanning thread completed. The kmemleak_free_part() is deliberately ignored by this patch since this is only called during boot before the scanning thread started. Signed-off-by:
Vignesh Radhakrishnan <vigneshr@codeaurora.org> Tested-by:
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Will Deacon authored
commit 6f1a6ae8 upstream. When building the kernel with a bare-metal (ELF) toolchain, the -shared option may not be passed down to collect2, resulting in silent corruption of the vDSO image (in particular, the DYNAMIC section is omitted). The effect of this corruption is that the dynamic linker fails to find the vDSO symbols and libc is instead used for the syscalls that we intended to optimise (e.g. gettimeofday). Functionally, there is no issue as the sigreturn trampoline is still intact and located by the kernel. This patch fixes the problem by explicitly passing -shared to the linker when building the vDSO. Reported-by:
Szabolcs Nagy <Szabolcs.Nagy@arm.com> Reported-by:
James Greenlaigh <james.greenhalgh@arm.com> Signed-off-by:
Will Deacon <will.deacon@arm.com> Signed-off-by:
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Dave P Martin authored
commit b9bcc919 upstream. The memmap freeing code in free_unused_memmap() computes the end of each memblock by adding the memblock size onto the base. However, if SPARSEMEM is enabled then the value (start) used for the base may already have been rounded downwards to work out which memmap entries to free after the previous memblock. This may cause memmap entries that are in use to get freed. In general, you're not likely to hit this problem unless there are at least 2 memblocks and one of them is not aligned to a sparsemem section boundary. Note that carve-outs can increase the number of memblocks by splitting the regions listed in the device tree. This problem doesn't occur with SPARSEMEM_VMEMMAP, because the vmemmap code deals with freeing the unused regions of the memmap instead of requiring the arch code to do it. This patch gets the memblock base out of the memblock directly when computing the block end address to ensure the correct value is used. Signed-off-by:
Dave Martin <Dave.Martin@arm.com> Signed-off-by:
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Mark Rutland authored
commit 46b0567c upstream. Commit 6c81fe79 ("arm64: enable context tracking") did not update el0_sp_pc to use ct_user_exit, but this appears to have been unintentional. In commit 6ab6463a ("arm64: adjust el0_sync so that a function can be called") we made x0 available, and in the return to userspace we call ct_user_enter in the kernel_exit macro. Due to this, we currently don't correctly inform RCU of the user->kernel transition, and may erroneously account for time spent in the kernel as if we were in an extended quiescent state when CONFIG_CONTEXT_TRACKING is enabled. As we do record the kernel->user transition, a userspace application making accesses from an unaligned stack pointer can demonstrate the imbalance, provoking the following warning: ------------[ cut here ]------------ WARNING: CPU: 2 PID: 3660 at kernel/context_tracking.c:75 context_tracking_enter+0xd8/0xe4() Modules linked in: CPU: 2 PID: 3660 Comm: a.out Not tainted 4.1.0-rc7+ #8 Hardware name: ARM Juno development board (r0) (DT) Call trace: [<ffffffc000089914>] dump_backtrace+0x0/0x124 [<ffffffc000089a48>] show_stack+0x10/0x1c [<ffffffc0005b3cbc>] dump_stack+0x84/0xc8 [<ffffffc0000b3214>] warn_slowpath_common+0x98/0xd0 [<ffffffc0000b330c>] warn_slowpath_null+0x14/0x20 [<ffffffc00013ada4>] context_tracking_enter+0xd4/0xe4 [<ffffffc0005b534c>] preempt_schedule_irq+0xd4/0x114 [<ffffffc00008561c>] el1_preempt+0x4/0x28 [<ffffffc0001b8040>] exit_files+0x38/0x4c [<ffffffc0000b5b94>] do_exit+0x430/0x978 [<ffffffc0000b614c>] do_group_exit+0x40/0xd4 [<ffffffc0000c0208>] get_signal+0x23c/0x4f4 [<ffffffc0000890b4>] do_signal+0x1ac/0x518 [<ffffffc000089650>] do_notify_resume+0x5c/0x68 ---[ end trace 963c192600337066 ]--- This patch adds the missing ct_user_exit to the el0_sp_pc entry path, correcting the context tracking for this case. Signed-off-by:
Mark Rutland <mark.rutland@arm.com> Acked-by:
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Catalin Marinas authored
commit 565630d5 upstream. After secondary CPU boot or hotplug, the active_mm of the idle thread is &init_mm. The init_mm.pgd (swapper_pg_dir) is only meant for TTBR1_EL1 and must not be set in TTBR0_EL1. Since when active_mm == &init_mm the TTBR0_EL1 is already set to the reserved value, there is no need to perform any context reset. Signed-off-by:
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Tomas Winkler authored
commit fe292283 upstream. HW has to be in known state before the initialisation sequence is started. The polling step for settling aliveness was set to 200ms while in practise this can be done in up to 30msecs. Signed-off-by:
Tomas Winkler <tomas.winkler@intel.com> Signed-off-by:
Barak Yoresh <barak.yoresh@intel.com> Signed-off-by:
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Alexander Usyskin authored
commit 3dc196ea upstream. Fix the hbm power gating state machine so it will wait till it receives confirmation interrupt for the PG_ISOLATION_EXIT message. In process of the suspend flow the devices first have to exit from the power gating state (runtime pm resume). If we do not handle the confirmation interrupt after sending PG_ISOLATION_EXIT message, we may receive it already after the suspend flow has changed the device state and interrupt will be interpreted as a spurious event, consequently link reset will be invoked which will prevent the device from completing the suspend flow kernel: [6603] mei_reset:136: mei_me 0000:00:16.0: powering down: end of reset kernel: [476] mei_me_irq_thread_handler:643: mei_me 0000:00:16.0: function called after ISR to handle the interrupt processing. kernel: mei_me 0000:00:16.0: FW not ready: resetting Cc: Gabriele Mazzotta <gabriele.mzt@gmail.com> Link: https://bugzilla.kernel.org/show_bug.cgi?id=86241 Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=770397Tested-by:
Gabriele Mazzotta <gabriele.mzt@gmail.com> Signed-off-by:
Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by:
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Krzysztof Kozlowski authored
commit 7f1a57fd upstream. Don't call the power_supply_changed() from power_supply_register() when parent is still probing because it may lead to accessing parent too early. In bq27x00_battery this caused NULL pointer exception because uevent of power_supply_changed called back the the get_property() method provided by the driver. The get_property() method accessed pointer which should be returned by power_supply_register(). Starting from bq27x00_battery_probe(): di->bat = power_supply_register() power_supply_changed() kobject_uevent() power_supply_uevent() power_supply_show_property() power_supply_get_property() bq27x00_battery_get_property() dereference of di->bat which is NULL here The dereference of di->bat (value returned by power_supply_register()) is the currently visible problem. However calling back the methods provided by driver before ending the probe may lead to accessing other driver-related data which is not yet initialized. The call to power_supply_changed() is postponed till probing ends - mutex of parent device is released. Reported-by:
H. Nikolaus Schaller <hns@goldelico.com> Signed-off-by:
Sebastian Reichel <sre@kernel.org> Signed-off-by:
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Krzysztof Kozlowski authored
commit 8e59c7f2 upstream. Power supply is often registered during probe of a driver. The power_supply_register() returns pointer to newly allocated structure as return value. However before returning the power_supply_register() calls back the get_property() method provided by the driver through uevent. In that time the driver probe is still in progress and driver did not assigned pointer to power supply to its local variables. This leads to NULL pointer dereference from get_property() function. Starting from bq27x00_battery_probe(): di->bat = power_supply_register() device_add() kobject_uevent() power_supply_uevent() power_supply_show_property() power_supply_get_property() bq27x00_battery_get_property() dereference of (di->bat) which is NULL here The first uevent of power supply (the one coming from device creation) should not call back to the driver. To prevent that from happening, increment the atomic use counter at the end of power_supply_register(). This means that power_supply_get_property() will return -ENODEV. IMPORTANT: The patch has impact on this first uevent sent from power supply because it will not contain properties from power supply. The uevent with properties will be sent later after indicating that power supply has changed. This also has a race now, but will be fixed in other patches. Reported-by:
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Max Filippov authored
commit 7002f775 upstream. static arc_pmu in the arch/arc/kernel/perf_event.c is not initialized as it's shadowed by a local variable of the same name in the arc_pmu_device_probe. Signed-off-by:
Max Filippov <jcmvbkbc@gmail.com> Fixes: 03c94fcf "ARC: perf: make @arc_pmu static global" Signed-off-by:
Vineet Gupta <vgupta@synopsys.com> Signed-off-by:
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Vineet Gupta authored
commit d57f7272 upstream. When auditing cmpxchg call sites, Chuck noted that gcc was optimizing away some of the desired LDs. | do { | new = old = *ipi_data_ptr; | new |= 1U << msg; | } while (cmpxchg(ipi_data_ptr, old, new) != old); was generating to below | 8015cef8: ld r2,[r4,0] <-- First LD | 8015cefc: bset r1,r2,r1 | | 8015cf00: llock r3,[r4] <-- atomic op | 8015cf04: brne r3,r2,8015cf10 | 8015cf08: scond r1,[r4] | 8015cf0c: bnz 8015cf00 | | 8015cf10: brne r3,r2,8015cf00 <-- Branch doesn't go to orig LD Although this was fixed by adding a ACCESS_ONCE in this call site, it seems safer (for now at least) to add compiler barrier to LLSC based cmpxchg Reported-by:
Chuck Jordan <cjordan@synopsys.com> Acked-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by:
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Vineet Gupta authored
commit 2576c28e upstream. - arch_spin_lock/unlock were lacking the ACQUIRE/RELEASE barriers Since ARCv2 only provides load/load, store/store and all/all, we need the full barrier - LLOCK/SCOND based atomics, bitops, cmpxchg, which return modified values were lacking the explicit smp barriers. - Non LLOCK/SCOND varaints don't need the explicit barriers since that is implicity provided by the spin locks used to implement the critical section (the spin lock barriers in turn are also fixed in this commit as explained above Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by:
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Arnaldo Carvalho de Melo authored
commit 60df4642 upstream. Make 3.81 doesn't have the 'undefine' command. Using undefine to clear LDFLAGS fails when make version 3.81 is used. Fix it to use override to clear LDFLAGS. Tested-by:
Shuah Khan <shuahkh@osg.samsung.com> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Link: http://lkml.kernel.org/r/20150514151225.GH23588@kernel.orgSigned-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by:
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Antonio Ospite authored
commit 61e2c70d upstream. This id has been seen in the DSDT of the Teclast X98 Air 3G tablet based on Intel Bay Trail. Signed-off-by:
Antonio Ospite <ao2@ao2.it> Cc: Bastien Nocera <hadess@hadess.net> Reviewed-by:
Daniel Baluta <daniel.baluta@intel.com> Signed-off-by:
Jonathan Cameron <jic23@kernel.org> Signed-off-by:
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Rafael J. Wysocki authored
commit 0f1b414d upstream. Commit b9a5e5e1 "ACPI / init: Fix the ordering of acpi_reserve_resources()" overlooked the fact that the memory and/or I/O regions reserved by acpi_reserve_resources() may conflict with those reserved by the PNP "system" driver. If that conflict actually takes place, it causes the reservations made by the "system" driver to fail while before commit b9a5e5e1 all reservations made by it and by acpi_reserve_resources() would be successful. In turn, that allows the resources that haven't been reserved by the "system" driver to be used by others (e.g. PCI) which sometimes leads to functional problems (up to and including boot failures). To fix that issue, introduce a common resource reservation routine, acpi_reserve_region(), to be used by both acpi_reserve_resources() and the "system" driver, that will track all resources reserved by it and avoid making conflicting requests. Link: https://bugzilla.kernel.org/show_bug.cgi?id=99831 Link: http://marc.info/?t=143389402600001&r=1&w=2 Fixes: b9a5e5e1 "ACPI / init: Fix the ordering of acpi_reserve_resources()" Reported-by:
Roland Dreier <roland@purestorage.com> Signed-off-by:
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Rafael J. Wysocki authored
commit 3d56402d upstream. Add missing invocation of pm_generic_complete() to acpi_subsys_complete() to allow ->complete callbacks provided by the drivers of devices using the ACPI PM domain to be executed during system resume. Fixes: f25c0ae2 (ACPI / PM: Avoid resuming devices in ACPI PM domain during system suspend) Signed-off-by:
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Rafael J. Wysocki authored
commit b064a8fa upstream. Commit 73f7d1ca "ACPI / init: Run acpi_early_init() before timekeeping_init()" moved the ACPI subsystem initialization, including the ACPI mode enabling, to an earlier point in the initialization sequence, to allow the timekeeping subsystem use ACPI early. Unfortunately, that resulted in boot regressions on some systems and the early ACPI initialization was moved toward its original position in the kernel initialization code by commit c4e1acbb "ACPI / init: Invoke early ACPI initialization later". However, that turns out to be insufficient, as boot is still broken on the Tyan S8812 mainboard. To fix that issue, split the ACPI early initialization code into two pieces so the majority of it still located in acpi_early_init() and the part switching over the platform into the ACPI mode goes into a new function, acpi_subsystem_init(), executed at the original early ACPI initialization spot. That fixes the Tyan S8812 boot problem, but still allows ACPI tables to be loaded earlier which is useful to the EFI code in efi_enter_virtual_mode(). Link: https://bugzilla.kernel.org/show_bug.cgi?id=97141 Fixes: 73f7d1ca "ACPI / init: Run acpi_early_init() before timekeeping_init()" Reported-and-tested-by:
Marius Tolzmann <tolzmann@molgen.mpg.de> Signed-off-by:
Toshi Kani <toshi.kani@hp.com> Reviewed-by:
Hanjun Guo <hanjun.guo@linaro.org> Reviewed-by:
Lee, Chun-Yi <jlee@suse.com> Signed-off-by:
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Takashi Iwai authored
commit 4275554d upstream. Dell E7450 [0128:062e] needs the same quirk as other E7xx models. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=100571Signed-off-by:
Takashi Iwai <tiwai@suse.de> Signed-off-by:
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