- 15 Sep, 2016 31 commits
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Miklos Szeredi authored
commit 0956254a upstream. When a copy up of a directory occurs which has the opaque xattr set, the xattr remains in the upper directory. The immediate behavior with overlayfs is that the upper directory is not treated as opaque, however after a remount the opaque flag is used and upper directory is treated as opaque. This causes files created in the lower layer to be hidden when using multiple lower directories. Fix by not copying up the opaque flag. To reproduce: ----8<---------8<---------8<---------8<---------8<---------8<---- mkdir -p l/d/s u v w mnt mount -t overlay overlay -olowerdir=l,upperdir=u,workdir=w mnt rm -rf mnt/d/ mkdir -p mnt/d/n umount mnt mount -t overlay overlay -olowerdir=u:l,upperdir=v,workdir=w mnt touch mnt/d/foo umount mnt mount -t overlay overlay -olowerdir=u:l,upperdir=v,workdir=w mnt ls mnt/d ----8<---------8<---------8<---------8<---------8<---------8<---- output should be: "foo n" Reported-by:
Derek McGowan <dmcg@drizz.net> Link: https://bugzilla.kernel.org/show_bug.cgi?id=151291Signed-off-by:
Miklos Szeredi <mszeredi@redhat.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Miklos Szeredi authored
commit eea2fb48 upstream. When mounting overlayfs it needs a clean "work" directory under the supplied workdir. Previously the mount code removed this directory if it already existed and created a new one. If the removal failed (e.g. directory was not empty) then it fell back to a read-only mount not using the workdir. While this has never been reported, it is possible to get a non-empty "work" dir from a previous mount of overlayfs in case of crash in the middle of an operation using the work directory. In this case the left over state should be discarded and the overlay filesystem will be consistent, guaranteed by the atomicity of operations on moving to/from the workdir to the upper layer. This patch implements cleaning out any files left in workdir. It is implemented using real recursion for simplicity, but the depth is limited to 2, because the worst case is that of a directory containing whiteouts under "work". Signed-off-by:
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Jan Beulich authored
commit 9a035a40 upstream. This should really only be done for XS_TRANSACTION_END messages, or else at least some of the xenstore-* tools don't work anymore. Fixes: 0beef634 ("xenbus: don't BUG() on user mode induced condition") Reported-by:
Richard Schütz <rschuetz@uni-koblenz.de> Signed-off-by:
Jan Beulich <jbeulich@suse.com> Tested-by:
David Vrabel <david.vrabel@citrix.com> Signed-off-by:
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John Stultz authored
commit 27727df2 upstream. When I added some extra sanity checking in timekeeping_get_ns() under CONFIG_DEBUG_TIMEKEEPING, I missed that the NMI safe __ktime_get_fast_ns() method was using timekeeping_get_ns(). Thus the locking added to the debug checks broke the NMI-safety of __ktime_get_fast_ns(). This patch open-codes the timekeeping_get_ns() logic for __ktime_get_fast_ns(), so can avoid any deadlocks in NMI. Fixes: 4ca22c26 "timekeeping: Add warnings when overflows or underflows are observed" Reported-by:
Steven Rostedt <rostedt@goodmis.org> Reported-by:
Peter Zijlstra <peterz@infradead.org> Signed-off-by:
John Stultz <john.stultz@linaro.org> Link: http://lkml.kernel.org/r/1471993702-29148-2-git-send-email-john.stultz@linaro.orgSigned-off-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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John Stultz authored
commit a4f8f666 upstream. It was reported that hibernation could fail on the 2nd attempt, where the system hangs at hibernate() -> syscore_resume() -> i8237A_resume() -> claim_dma_lock(), because the lock has already been taken. However there is actually no other process would like to grab this lock on that problematic platform. Further investigation showed that the problem is triggered by setting /sys/power/pm_trace to 1 before the 1st hibernation. Since once pm_trace is enabled, the rtc becomes unmeaningful after suspend, and meanwhile some BIOSes would like to adjust the 'invalid' RTC (e.g, smaller than 1970) to the release date of that motherboard during POST stage, thus after resumed, it may seem that the system had a significant long sleep time which is a completely meaningless value. Then in timekeeping_resume -> tk_debug_account_sleep_time, if the bit31 of the sleep time happened to be set to 1, fls() returns 32 and we add 1 to sleep_time_bin[32], which causes an out of bounds array access and therefor memory being overwritten. As depicted by System.map: 0xffffffff81c9d080 b sleep_time_bin 0xffffffff81c9d100 B dma_spin_lock the dma_spin_lock.val is set to 1, which caused this problem. This patch adds a sanity check in tk_debug_account_sleep_time() to ensure we don't index past the sleep_time_bin array. [jstultz: Problem diagnosed and original patch by Chen Yu, I've solved the issue slightly differently, but borrowed his excelent explanation of the issue here.] Fixes: 5c83545f "power: Add option to log time spent in suspend" Reported-by:
Janek Kozicki <cosurgi@gmail.com> Reported-by:
Chen Yu <yu.c.chen@intel.com> Signed-off-by:
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Dave Chinner authored
commit f3d7ebde upstream. From inspection, the superblock sb_inprogress check is done in the verifier and triggered only for the primary superblock via a "bp->b_bn == XFS_SB_DADDR" check. Unfortunately, the primary superblock is an uncached buffer, and hence it is configured by xfs_buf_read_uncached() with: bp->b_bn = XFS_BUF_DADDR_NULL; /* always null for uncached buffers */ And so this check never triggers. Fix it. Signed-off-by:
Dave Chinner <dchinner@redhat.com> Reviewed-by:
Brian Foster <bfoster@redhat.com> Reviewed-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
Dave Chinner <david@fromorbit.com> Signed-off-by:
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Christoph Huber authored
commit 3e103a65 upstream. commit cbaadf0f ("ASoC: atmel_ssc_dai: refactor the startup and shutdown") refactored code such that the SSC is reset on every startup; this breaks duplex audio (e.g. first start audio playback, then start record, causing the playback to stop/hang) Fixes: cbaadf0f (ASoC: atmel_ssc_dai: refactor the startup and shutdown) Signed-off-by:
Christoph Huber <c.huber@bct-electronic.com> Signed-off-by:
Peter Meerwald-Stadler <p.meerwald@bct-electronic.com> Signed-off-by:
Mark Brown <broonie@kernel.org> Signed-off-by:
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Eric Anholt authored
commit 552416c1 upstream. We'd end up NULL pointer dereferencing because we didn't take the error path out in the parent. Fixes igt vc4_lookup_fail test. Signed-off-by:
Eric Anholt <eric@anholt.net> Fixes: d5b1a78a ("drm/vc4: Add support for drawing 3D frames.") Signed-off-by:
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Eric Anholt authored
commit 9326e6f2 upstream. Overflow memory handling is tricky: While it's still referenced by the BPO registers, we want to keep it from being freed. When we are putting a new set of overflow memory in the registers, we need to assign the old one to the last rendering job using it. We were looking at "what's currently running in the binner", but since the bin/render submission split, we may end up with the binner completing and having no new job while the renderer is still processing. So, if we don't find a bin job at all, look at the highest-seqno (last) render job to attach our overflow to. Signed-off-by:
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Eric Anholt authored
commit d5fb46e0 upstream. If you managed to exceed the limit to switch to vmalloc, we'd use the wrong free. Signed-off-by:
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Rob Clark authored
commit 89f82cbb upstream. Use instead __copy_from_user_inatomic() and fallback to slow-path where we drop and re-aquire the lock in case of fault. Reported-by:
Vaishali Thakkar <vaishali.thakkar@oracle.com> Signed-off-by:
Rob Clark <robdclark@gmail.com> Signed-off-by:
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Daniel Vetter authored
commit 6f00975c upstream. Somehow this one slipped through, which means drivers without modeset support can be oopsed (since those also don't call drm_mode_config_init, which means the crtc lookup will chase an uninitalized idr). Reported-by:
Alexander Potapenko <glider@google.com> Cc: Alexander Potapenko <glider@google.com> Signed-off-by:
Daniel Vetter <daniel.vetter@intel.com> Reviewed-by:
Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by:
Dave Airlie <airlied@redhat.com> Signed-off-by:
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Mario Kleiner authored
commit add1fa75 upstream. Due to assigning the 'replaced' value instead of or'ing it, if drm_atomic_crtc_set_property() gets called multiple times, the last call will define the color_mgmt_changed flag, so a non-updating call to a property can reset the flag and prevent actual hw state updates required by preceding property updates. Signed-off-by:
Mario Kleiner <mario.kleiner.de@gmail.com> Cc: Daniel Vetter <daniel.vetter@intel.com> Reviewed-by:
Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by:
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Christian König authored
commit ae5b80d2 upstream. Looks like some RV6xx have problems with that. bug: https://bugs.freedesktop.org/show_bug.cgi?id=97099Reviewed-by:
Alex Deucher <alexander.deucher@amd.com> Signed-off-by:
Christian König <christian.koenig@amd.com> Signed-off-by:
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Christian König authored
commit 13f479b9 upstream. This bug seems to be present for a very long time. Signed-off-by:
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Oliver Neukum authored
This is an alternative to eccf2a4e which inadvertedly fixes an oops in probe by a device returning malformed descriptors. The problem allows a malicious device to attack the kernel. That patch in v4.8 is too extensive to backport to stable. Thus this alternative fix is needed up to v4.7 Signed-off-by:
Oliver Neukum <oneukum@suse.com> Reported-by:
Binyamin Sharet <bsharet@cisco.com> Tested-by:
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Balbir Singh authored
commit 568ac888 upstream. cgroup_threadgroup_rwsem is acquired in read mode during process exit and fork. It is also grabbed in write mode during __cgroups_proc_write(). I've recently run into a scenario with lots of memory pressure and OOM and I am beginning to see systemd __switch_to+0x1f8/0x350 __schedule+0x30c/0x990 schedule+0x48/0xc0 percpu_down_write+0x114/0x170 __cgroup_procs_write.isra.12+0xb8/0x3c0 cgroup_file_write+0x74/0x1a0 kernfs_fop_write+0x188/0x200 __vfs_write+0x6c/0xe0 vfs_write+0xc0/0x230 SyS_write+0x6c/0x110 system_call+0x38/0xb4 This thread is waiting on the reader of cgroup_threadgroup_rwsem to exit. The reader itself is under memory pressure and has gone into reclaim after fork. There are times the reader also ends up waiting on oom_lock as well. __switch_to+0x1f8/0x350 __schedule+0x30c/0x990 schedule+0x48/0xc0 jbd2_log_wait_commit+0xd4/0x180 ext4_evict_inode+0x88/0x5c0 evict+0xf8/0x2a0 dispose_list+0x50/0x80 prune_icache_sb+0x6c/0x90 super_cache_scan+0x190/0x210 shrink_slab.part.15+0x22c/0x4c0 shrink_zone+0x288/0x3c0 do_try_to_free_pages+0x1dc/0x590 try_to_free_pages+0xdc/0x260 __alloc_pages_nodemask+0x72c/0xc90 alloc_pages_current+0xb4/0x1a0 page_table_alloc+0xc0/0x170 __pte_alloc+0x58/0x1f0 copy_page_range+0x4ec/0x950 copy_process.isra.5+0x15a0/0x1870 _do_fork+0xa8/0x4b0 ppc_clone+0x8/0xc In the meanwhile, all processes exiting/forking are blocked almost stalling the system. This patch moves the threadgroup_change_begin from before cgroup_fork() to just before cgroup_canfork(). There is no nee to worry about threadgroup changes till the task is actually added to the threadgroup. This avoids having to call reclaim with cgroup_threadgroup_rwsem held. tj: Subject and description edits. Signed-off-by:
Balbir Singh <bsingharora@gmail.com> Acked-by:
Zefan Li <lizefan@huawei.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Tejun Heo <tj@kernel.org> Signed-off-by:
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Ming Lei authored
commit 4d70dca4 upstream. After arbitrary bio size was introduced, the incoming bio may be very big. We have to split the bio into small bios so that each holds at most BIO_MAX_PAGES bvecs for safety reason, such as bio_clone(). This patch fixes the following kernel crash: > [ 172.660142] BUG: unable to handle kernel NULL pointer dereference at 0000000000000028 > [ 172.660229] IP: [<ffffffff811e53b4>] bio_trim+0xf/0x2a > [ 172.660289] PGD 7faf3e067 PUD 7f9279067 PMD 0 > [ 172.660399] Oops: 0000 [#1] SMP > [...] > [ 172.664780] Call Trace: > [ 172.664813] [<ffffffffa007f3be>] ? raid1_make_request+0x2e8/0xad7 [raid1] > [ 172.664846] [<ffffffff811f07da>] ? blk_queue_split+0x377/0x3d4 > [ 172.664880] [<ffffffffa005fb5f>] ? md_make_request+0xf6/0x1e9 [md_mod] > [ 172.664912] [<ffffffff811eb860>] ? generic_make_request+0xb5/0x155 > [ 172.664947] [<ffffffffa0445c89>] ? prio_io+0x85/0x95 [bcache] > [ 172.664981] [<ffffffffa0448252>] ? register_cache_set+0x355/0x8d0 [bcache] > [ 172.665016] [<ffffffffa04497d3>] ? register_bcache+0x1006/0x1174 [bcache] The issue can be reproduced by the following steps: - create one raid1 over two virtio-blk - build bcache device over the above raid1 and another cache device and bucket size is set as 2Mbytes - set cache mode as writeback - run random write over ext4 on the bcache device Fixes: 54efd50b(block: make generic_make_request handle arbitrarily sized bios) Reported-by:
Sebastian Roesner <sroesner-kernelorg@roesner-online.de> Reported-by:
Eric Wheeler <bcache@lists.ewheeler.net> Cc: Shaohua Li <shli@fb.com> Acked-by:
Kent Overstreet <kent.overstreet@gmail.com> Signed-off-by:
Ming Lei <ming.lei@canonical.com> Signed-off-by:
Jens Axboe <axboe@fb.com> Signed-off-by:
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Bart Van Assche authored
commit 1b856086 upstream. blk_set_queue_dying() can be called while another thread is submitting I/O or changing queue flags, e.g. through dm_stop_queue(). Hence protect the QUEUE_FLAG_DYING flag change with locking. Signed-off-by:
Bart Van Assche <bart.vanassche@sandisk.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Mike Snitzer <snitzer@redhat.com> Signed-off-by:
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Daeho Jeong authored
commit b47820ed upstream. We temporally change checksum fields in buffers of some types of metadata into '0' for verifying the checksum values. By doing this without locking the buffer, some metadata's checksums, which are being committed or written back to the storage, could be damaged. In our test, several metadata blocks were found with damaged metadata checksum value during recovery process. When we only verify the checksum value, we have to avoid modifying checksum fields directly. Signed-off-by:
Daeho Jeong <daeho.jeong@samsung.com> Signed-off-by:
Youngjin Gil <youngjin.gil@samsung.com> Signed-off-by:
Theodore Ts'o <tytso@mit.edu> Reviewed-by:
Darrick J. Wong <darrick.wong@oracle.com> Cc: Török Edwin <edwin@etorok.net> Signed-off-by:
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Jan Kara authored
commit 2e81a4ee upstream. When we need to move xattrs into external xattr block, we call ext4_xattr_block_set() from ext4_expand_extra_isize_ea(). That may end up calling ext4_mark_inode_dirty() again which will recurse back into the inode expansion code leading to deadlocks. Protect from recursion using EXT4_STATE_NO_EXPAND inode flag and move its management into ext4_expand_extra_isize_ea() since its manipulation is safe there (due to xattr_sem) from possible races with ext4_xattr_set_handle() which plays with it as well. Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
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Jan Kara authored
commit 443a8c41 upstream. We did not count with the padding of xattr value when computing desired shift of xattrs in the inode when expanding i_extra_isize. As a result we could create unaligned start of inline xattrs. Account for alignment properly. Signed-off-by:
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Jan Kara authored
commit 418c12d0 upstream. When multiple xattrs need to be moved out of inode, we did not properly recompute total size of xattr headers in the inode and the new header position. Thus when moving the second and further xattr we asked ext4_xattr_shift_entries() to move too much and from the wrong place, resulting in possible xattr value corruption or general memory corruption. Signed-off-by:
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Jan Kara authored
commit d0141191 upstream. The code in ext4_expand_extra_isize_ea() treated new_extra_isize argument sometimes as the desired target i_extra_isize and sometimes as the amount by which we need to grow current i_extra_isize. These happen to coincide when i_extra_isize is 0 which used to be the common case and so nobody noticed this until recently when we added i_projid to the inode and so i_extra_isize now needs to grow from 28 to 32 bytes. The result of these bugs was that we sometimes unnecessarily decided to move xattrs out of inode even if there was enough space and we often ended up corrupting in-inode xattrs because arguments to ext4_xattr_shift_entries() were just wrong. This could demonstrate itself as BUG_ON in ext4_xattr_shift_entries() triggering. Fix the problem by introducing new isize_diff variable and use it where appropriate. Reported-by:
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Theodore Ts'o authored
commit 829fa70d upstream. A number of fuzzing failures seem to be caused by allocation bitmaps or other metadata blocks being pointed at the superblock. This can cause kernel BUG or WARNings once the superblock is overwritten, so validate the group descriptor blocks to make sure this doesn't happen. Signed-off-by:
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Seth Forshee authored
commit 5f65e5ca upstream. Using INVALID_[UG]ID for the LSM file creation context doesn't make sense, so return an error if the inode passed to set_create_file_as() has an invalid id. Signed-off-by:
Seth Forshee <seth.forshee@canonical.com> Acked-by:
Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by:
Eric W. Biederman <ebiederm@xmission.com> Signed-off-by:
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Seth Forshee authored
commit 2d7f9e2a upstream. Filesystem uids which don't map into a user namespace may result in inode->i_uid being INVALID_UID. A symlink and its parent could have different owners in the filesystem can both get mapped to INVALID_UID, which may result in following a symlink when this would not have otherwise been permitted when protected symlinks are enabled. Signed-off-by:
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Tyler Hicks authored
commit d6e0d306 upstream. The capability check should not be audited since it is only being used to determine the inode permissions. A failed check does not indicate a violation of security policy but, when an LSM is enabled, a denial audit message was being generated. The denial audit message caused confusion for some application authors because root-running Go applications always triggered the denial. To prevent this confusion, the capability check in net_ctl_permissions() is switched to the noaudit variant. BugLink: https://launchpad.net/bugs/1465724Signed-off-by:
Tyler Hicks <tyhicks@canonical.com> Acked-by:
Serge E. Hallyn <serge.hallyn@ubuntu.com> Signed-off-by:
James Morris <james.l.morris@oracle.com> Signed-off-by:
Sasha Levin <alexander.levin@verizon.com> Signed-off-by:
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Tyler Hicks authored
commit 98f368e9 upstream. When checking the current cred for a capability in a specific user namespace, it isn't always desirable to have the LSMs audit the check. This patch adds a noaudit variant of ns_capable() for when those situations arise. The common logic between ns_capable() and the new ns_capable_noaudit() is moved into a single, shared function to keep duplicated code to a minimum and ease maintainability. Signed-off-by:
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John Johansen authored
commit de7c4cc9 upstream. When finding a child profile via an rcu critical section, the profile may be put and scheduled for deletion after the child is found but before its refcount is incremented. Protect against this by repeating the lookup if the profiles refcount is 0 and is one its way to deletion. Signed-off-by:
John Johansen <john.johansen@canonical.com> Acked-by:
Seth Arnold <seth.arnold@canonical.com> Signed-off-by:
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Jens Axboe authored
commit f2791e7e upstream. This reverts commit 09954bad. Cc: Mark Hounschell <markh@compro.net> Signed-off-by:
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- 07 Sep, 2016 9 commits
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Greg Kroah-Hartman authored
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Trond Myklebust authored
commit bdc54d8e upstream. If there were less than 2 entries in the multipath list, then xprt_iter_next_entry_multiple() would never advance beyond the first entry, which is correct for round robin behaviour, but not for the list iteration. The end result would be infinite looping in rpc_clnt_iterate_for_each_xprt() as we would never see the xprt == NULL condition fulfilled. Reported-by:
Oleg Drokin <green@linuxhacker.ru> Fixes: 80b14d5e ("SUNRPC: Add a structure to track multiple transports") Signed-off-by:
Trond Myklebust <trond.myklebust@primarydata.com> Cc: Jason L Tibbitts III <tibbs@math.uh.edu> Signed-off-by:
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Konstantin Khlebnikov authored
commit 17d0774f upstream. Attributes declared with __ATTR_PREALLOC use sysfs_kf_read() which returns zero bytes for non-zero offset. This breaks script checkarray in mdadm tool in debian where /bin/sh is 'dash' because its builtin 'read' reads only one byte at a time. Script gets 'i' instead of 'idle' when reads current action from /sys/block/$dev/md/sync_action and as a result does nothing. This patch adds trivial implementation of partial read: generate whole string and move required part into buffer head. Signed-off-by:
Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Fixes: 4ef67a8c ("sysfs/kernfs: make read requests on pre-alloc files use the buffer.") Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=787950Acked-by:
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Quentin Schulz authored
commit 5d17d3b4 upstream. The "name" variable's memory is now freed when the device is destructed thanks to devm function. Signed-off-by:
Quentin Schulz <quentin.schulz@free-electrons.com> Reported-by:
Guenter Roeck <linux@roeck-us.net> Fixes: e0f8a24e ("staging:iio::hwmon interface client driver.") Fixes: 61bb53bc ("hwmon: (iio_hwmon) Add support for humidity sensors") Signed-off-by:
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Jean Delvare authored
commit 3c329263 upstream. Attribute array it87_attributes_in lacks its NULL terminator, causing random behavior when operating on the attribute group. Fixes: 52929715 ("hwmon: (it87) Use is_visible for voltage sensors") Signed-off-by:
Jean Delvare <jdelvare@suse.de> Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Cc: Guenter Roeck <linux@roeck-us.net> Signed-off-by:
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Andrej Krutak authored
commit b027d112 upstream. The commit 02fc76f6 changed base of the sysfs attributes from device to card. The "show" callbacks dereferenced wrong objects because of this. Fixes: 02fc76f6 ('ALSA: line6: Create sysfs via snd_card_add_dev_attr()') Reviewed-by:
Stefan Hajnoczi <stefanha@gmail.com> Signed-off-by:
Andrej Krutak <dev@andree.sk> Signed-off-by:
Takashi Iwai <tiwai@suse.de> Signed-off-by:
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Andrej Krutak authored
commit adc8a43a upstream. Done, because line6_stream_stop() locks and calls line6_unlink_audio_urbs(), which in turn invokes audio_out_callback(), which tries to lock 2nd time. Fixes: ============================================= [ INFO: possible recursive locking detected ] 4.4.15+ #15 Not tainted --------------------------------------------- mplayer/3591 is trying to acquire lock: (&(&line6pcm->out.lock)->rlock){-.-...}, at: [<bfa27655>] audio_out_callback+0x70/0x110 [snd_usb_line6] but task is already holding lock: (&(&line6pcm->out.lock)->rlock){-.-...}, at: [<bfa26aad>] line6_stream_stop+0x24/0x5c [snd_usb_line6] other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&(&line6pcm->out.lock)->rlock); lock(&(&line6pcm->out.lock)->rlock); *** DEADLOCK *** May be due to missing lock nesting notation 3 locks held by mplayer/3591: #0: (snd_pcm_link_rwlock){.-.-..}, at: [<bf8d49a7>] snd_pcm_stream_lock+0x1e/0x40 [snd_pcm] #1: (&(&substream->self_group.lock)->rlock){-.-...}, at: [<bf8d49af>] snd_pcm_stream_lock+0x26/0x40 [snd_pcm] #2: (&(&line6pcm->out.lock)->rlock){-.-...}, at: [<bfa26aad>] line6_stream_stop+0x24/0x5c [snd_usb_line6] stack backtrace: CPU: 0 PID: 3591 Comm: mplayer Not tainted 4.4.15+ #15 Hardware name: Generic AM33XX (Flattened Device Tree) [<c0015d85>] (unwind_backtrace) from [<c001253d>] (show_stack+0x11/0x14) [<c001253d>] (show_stack) from [<c02f1bdf>] (dump_stack+0x8b/0xac) [<c02f1bdf>] (dump_stack) from [<c0076f43>] (__lock_acquire+0xc8b/0x1780) [<c0076f43>] (__lock_acquire) from [<c007810d>] (lock_acquire+0x99/0x1c0) [<c007810d>] (lock_acquire) from [<c06171e7>] (_raw_spin_lock_irqsave+0x3f/0x4c) [<c06171e7>] (_raw_spin_lock_irqsave) from [<bfa27655>] (audio_out_callback+0x70/0x110 [snd_usb_line6]) [<bfa27655>] (audio_out_callback [snd_usb_line6]) from [<c04294db>] (__usb_hcd_giveback_urb+0x53/0xd0) [<c04294db>] (__usb_hcd_giveback_urb) from [<c046388d>] (musb_giveback+0x3d/0x98) [<c046388d>] (musb_giveback) from [<c04647f5>] (musb_urb_dequeue+0x6d/0x114) [<c04647f5>] (musb_urb_dequeue) from [<c042ac11>] (usb_hcd_unlink_urb+0x39/0x98) [<c042ac11>] (usb_hcd_unlink_urb) from [<bfa26a87>] (line6_unlink_audio_urbs+0x6a/0x6c [snd_usb_line6]) [<bfa26a87>] (line6_unlink_audio_urbs [snd_usb_line6]) from [<bfa26acb>] (line6_stream_stop+0x42/0x5c [snd_usb_line6]) [<bfa26acb>] (line6_stream_stop [snd_usb_line6]) from [<bfa26fe7>] (snd_line6_trigger+0xb6/0xf4 [snd_usb_line6]) [<bfa26fe7>] (snd_line6_trigger [snd_usb_line6]) from [<bf8d47b7>] (snd_pcm_do_stop+0x36/0x38 [snd_pcm]) [<bf8d47b7>] (snd_pcm_do_stop [snd_pcm]) from [<bf8d462f>] (snd_pcm_action_single+0x22/0x40 [snd_pcm]) [<bf8d462f>] (snd_pcm_action_single [snd_pcm]) from [<bf8d46f9>] (snd_pcm_action+0xac/0xb0 [snd_pcm]) [<bf8d46f9>] (snd_pcm_action [snd_pcm]) from [<bf8d4b61>] (snd_pcm_drop+0x38/0x64 [snd_pcm]) [<bf8d4b61>] (snd_pcm_drop [snd_pcm]) from [<bf8d6233>] (snd_pcm_common_ioctl1+0x7fe/0xbe8 [snd_pcm]) [<bf8d6233>] (snd_pcm_common_ioctl1 [snd_pcm]) from [<bf8d6779>] (snd_pcm_playback_ioctl1+0x15c/0x51c [snd_pcm]) [<bf8d6779>] (snd_pcm_playback_ioctl1 [snd_pcm]) from [<bf8d6b59>] (snd_pcm_playback_ioctl+0x20/0x28 [snd_pcm]) [<bf8d6b59>] (snd_pcm_playback_ioctl [snd_pcm]) from [<c016714b>] (do_vfs_ioctl+0x3af/0x5c8) Fixes: 63e20df1 ('ALSA: line6: Reorganize PCM stream handling') Reviewed-by:
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Andrej Krutak authored
commit 7e4379ea upstream. If there's an error, pcm is released in line6_pcm_acquire already. Fixes: 247d95ee ('ALSA: line6: Handle error from line6_pcm_acquire()') Reviewed-by:
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Lorenzo Pieralisi authored
commit 5331d9ca upstream. Commit e647b532 ("ACPI: Add early device probing infrastructure") introduced code that allows inserting driver specific struct acpi_probe_entry probe entries into ACPI linker sections (one per-subsystem, eg irqchip, clocksource) that are then walked to retrieve the data and function hooks required to probe the respective kernel components. Probing for all entries in a section is triggered through the __acpi_probe_device_table() function, that in turn, according to the table ID a given probe entry reports parses the table with the function retrieved from the respective section structures (ie struct acpi_probe_entry). Owing to the current ACPI table parsing implementation, the __acpi_probe_device_table() function has to share global variables with the acpi_match_madt() function, so in order to guarantee mutual exclusion locking is required between the two functions. Current kernel code implements the locking through the acpi_probe_lock spinlock; this has the side effect of requiring all code called within the lock (ie struct acpi_probe_entry.probe_{table/subtbl} hooks) not to sleep. However, kernel subsystems that make use of the early probing infrastructure are relying on kernel APIs that may sleep (eg irq_domain_alloc_fwnode(), among others) in the function calls pointed at by struct acpi_probe_entry.{probe_table/subtbl} entries (eg gic_v2_acpi_init()), which is a bug. Since __acpi_probe_device_table() is called from context that is allowed to sleep the acpi_probe_lock spinlock can be replaced with a mutex; this fixes the issue whilst still guaranteeing mutual exclusion. Signed-off-by:
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Fixes: e647b532 (ACPI: Add early device probing infrastructure) Signed-off-by:
Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by:
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