- 17 Sep, 2014 33 commits
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Nikesh Oswal authored
commit 5b919f3e upstream. WM5110/8280 devices do not support bypass mode for LDO1 so remove the bypass callbacks registered with regulator core. Signed-off-by:
Nikesh Oswal <nikesh@opensource.wolfsonmicro.com> Signed-off-by:
Mark Brown <broonie@linaro.org> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Tony Lindgren authored
commit daebabd5 upstream. Commit 43fef47f (mfd: twl4030-power: Add a configuration to turn off oscillator during off-idle) added support for configuring the PMIC to cut off resources during deeper idle states to save power. This however caused regression for n900 display power that needed the PMIC configuration to be disabled with commit d937678a (ARM: dts: Revert enabling of twl configuration for n900). Turns out the root cause of the problem is that we must use TWL4030_RESCONFIG_UNDEF instead of DEV_GRP_NULL to avoid disabling regulators that may have been enabled before the init function for twl4030-power.c runs. With TWL4030_RESCONFIG_UNDEF we let the regulator framework control the regulators like it should. Here we need to only configure the sys_clken and sys_off_mode triggers for the regulators that cannot be done by the regulator framework as it's not running at that point. This allows us to enable the PMIC configuration for n900. Fixes: 43fef47f (mfd: twl4030-power: Add a configuration to turn off oscillator during off-idle) Signed-off-by:
Tony Lindgren <tony@atomide.com> Tested-by:
Aaro Koskinen <aaro.koskinen@iki.fi> Signed-off-by:
Lee Jones <lee.jones@linaro.org> Signed-off-by:
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Jeff Mahoney authored
commit 18139089 upstream. The rtsx_usb driver contains the table for the devices it supports but doesn't export it. As a result, no alias is generated and it doesn't get loaded automatically. Via https://bugzilla.novell.com/show_bug.cgi?id=890096Signed-off-by:
Jeff Mahoney <jeffm@suse.com> Reported-by:
Marcel Witte <wittemar@googlemail.com> Cc: Roger Tseng <rogerable@realtek.com> 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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Michael Welling authored
commit 46de8ff8 upstream. single-ulpi-bypass is a flag used for older OMAP3 silicon. The flag when set, can excite code that improperly uses the OMAP_UHH_HOSTCONFIG_UPLI_BYPASS define to clear the corresponding bit. Instead it clears all of the other bits disabling all of the ports in the process. Signed-off-by:
Michael Welling <mwelling@emacinc.com> Signed-off-by:
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Sasha Levin authored
commit 618fde87 upstream. The rarely-executed memry-allocation-failed callback path generates a WARN_ON_ONCE() when smp_call_function_single() succeeds. Presumably it's supposed to warn on failures. Signed-off-by:
Sasha Levin <sasha.levin@oracle.com> Cc: Christoph Lameter <cl@gentwo.org> Cc: Gilad Ben-Yossef <gilad@benyossef.com> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Tejun Heo <htejun@gmail.com> Signed-off-by:
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Li Zhong authored
commit d0177639 upstream. It is possible for some platforms, such as powerpc to set HPAGE_SHIFT to 0 to indicate huge pages not supported. When this is the case, hugetlbfs could be disabled during boot time: hugetlbfs: disabling because there are no supported hugepage sizes Then in dissolve_free_huge_pages(), order is kept maximum (64 for 64bits), and the for loop below won't end: for (pfn = start_pfn; pfn < end_pfn; pfn += 1 << order) As suggested by Naoya, below fix checks hugepages_supported() before calling dissolve_free_huge_pages(). [rientjes@google.com: no legitimate reason to call dissolve_free_huge_pages() when !hugepages_supported()] Signed-off-by:
Li Zhong <zhong@linux.vnet.ibm.com> Acked-by:
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Acked-by:
David Rientjes <rientjes@google.com> Signed-off-by:
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Pranith Kumar authored
commit e04aca4a upstream. Fix build error as reported by Geert Uytterhoeven here: http://kisskb.ellerman.id.au/kisskb/buildresult/11607865/ The error happens when CONFIG_HAS_IOPORT_MAP=n because of which there are missing definitions of ioport_map/unmap(). Fix this build error by adding these prototypes. Signed-off-by:
Pranith Kumar <bobby.prani@gmail.com> Reported-by:
Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by:
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Ben Hutchings authored
commit 2b462638 upstream. If we failed to copy from the structure, writing back the flags leaks 31 bits of kernel memory (the rest of the ir_flags field). In any case, if we cannot copy from/to the structure, why should we expect putting just the flags to work? Also make sure ocfs2_info_handle_freeinode() returns the right error code if the copy_to_user() fails. Fixes: ddee5cdb ('Ocfs2: Add new OCFS2_IOC_INFO ioctl for ocfs2 v8.') Signed-off-by:
Ben Hutchings <ben@decadent.org.uk> Cc: Joel Becker <jlbec@evilplan.org> Acked-by:
Mark Fasheh <mfasheh@suse.com> Signed-off-by:
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Jan Kara authored
commit 5838d444 upstream. Commit 85816794 ("fanotify: Fix use after free for permission events") introduced a double free issue for permission events which are pending in group's notification queue while group is being destroyed. These events are freed from fanotify_handle_event() but they are not removed from groups notification queue and thus they get freed again from fsnotify_flush_notify(). Fix the problem by removing permission events from notification queue before freeing them if we skip processing access response. Also expand comments in fanotify_release() to explain group shutdown in detail. Fixes: 85816794Signed-off-by:
Jan Kara <jack@suse.cz> Reported-by:
Douglas Leeder <douglas.leeder@sophos.com> Tested-by:
Heinrich Schuchard <xypron.glpk@gmx.de> Signed-off-by:
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Eric Paris authored
commit 7d8b6c63 upstream. This is effectively a revert of 7b9a7ec5 plus fixing it a different way... We found, when trying to run an application from an application which had dropped privs that the kernel does security checks on undefined capability bits. This was ESPECIALLY difficult to debug as those undefined bits are hidden from /proc/$PID/status. Consider a root application which drops all capabilities from ALL 4 capability sets. We assume, since the application is going to set eff/perm/inh from an array that it will clear not only the defined caps less than CAP_LAST_CAP, but also the higher 28ish bits which are undefined future capabilities. The BSET gets cleared differently. Instead it is cleared one bit at a time. The problem here is that in security/commoncap.c::cap_task_prctl() we actually check the validity of a capability being read. So any task which attempts to 'read all things set in bset' followed by 'unset all things set in bset' will not even attempt to unset the undefined bits higher than CAP_LAST_CAP. So the 'parent' will look something like: CapInh: 0000000000000000 CapPrm: 0000000000000000 CapEff: 0000000000000000 CapBnd: ffffffc000000000 All of this 'should' be fine. Given that these are undefined bits that aren't supposed to have anything to do with permissions. But they do... So lets now consider a task which cleared the eff/perm/inh completely and cleared all of the valid caps in the bset (but not the invalid caps it couldn't read out of the kernel). We know that this is exactly what the libcap-ng library does and what the go capabilities library does. They both leave you in that above situation if you try to clear all of you capapabilities from all 4 sets. If that root task calls execve() the child task will pick up all caps not blocked by the bset. The bset however does not block bits higher than CAP_LAST_CAP. So now the child task has bits in eff which are not in the parent. These are 'meaningless' undefined bits, but still bits which the parent doesn't have. The problem is now in cred_cap_issubset() (or any operation which does a subset test) as the child, while a subset for valid cap bits, is not a subset for invalid cap bits! So now we set durring commit creds that the child is not dumpable. Given it is 'more priv' than its parent. It also means the parent cannot ptrace the child and other stupidity. The solution here: 1) stop hiding capability bits in status This makes debugging easier! 2) stop giving any task undefined capability bits. it's simple, it you don't put those invalid bits in CAP_FULL_SET you won't get them in init and you won't get them in any other task either. This fixes the cap_issubset() tests and resulting fallout (which made the init task in a docker container untraceable among other things) 3) mask out undefined bits when sys_capset() is called as it might use ~0, ~0 to denote 'all capabilities' for backward/forward compatibility. This lets 'capsh --caps="all=eip" -- -c /bin/bash' run. 4) mask out undefined bit when we read a file capability off of disk as again likely all bits are set in the xattr for forward/backward compatibility. This lets 'setcap all+pe /bin/bash; /bin/bash' run Signed-off-by:
Eric Paris <eparis@redhat.com> Reviewed-by:
Kees Cook <keescook@chromium.org> Cc: Andrew Vagin <avagin@openvz.org> Cc: Andrew G. Morgan <morgan@kernel.org> Cc: Serge E. Hallyn <serge.hallyn@canonical.com> Cc: Kees Cook <keescook@chromium.org> Cc: Steve Grubb <sgrubb@redhat.com> Cc: Dan Walsh <dwalsh@redhat.com> Signed-off-by:
James Morris <james.l.morris@oracle.com> Signed-off-by:
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Stefan Berger authored
commit b49e1043 upstream. Properly clean the sysfs entries in the error path Reported-by:
Dmitry Kasatkin <dmitry.kasatkin@gmail.com> Signed-off-by:
Stefan Berger <stefanb@linux.vnet.ibm.com> Reviewed-by:
Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Signed-off-by:
Peter Huewe <peterhuewe@gmx.de> Signed-off-by:
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Jason Gunthorpe authored
commit 8e54caf4 upstream. Some Atmel TPMs provide completely wrong timeouts from their TPM_CAP_PROP_TIS_TIMEOUT query. This patch detects that and returns new correct values via a DID/VID table in the TIS driver. Tested on ARM using an AT97SC3204T FW version 37.16 [PHuewe: without this fix these 'broken' Atmel TPMs won't function on older kernels] Signed-off-by:
"Berg, Christopher" <Christopher.Berg@atmel.com> Signed-off-by:
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Jarkko Sakkinen authored
commit 3e14d83e upstream. Regression in 41ab999c. Call to tpm_chip_put is missing. This will cause TPM device driver not to unload if tmp_get_random() is called. Signed-off-by:
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by:
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Guenter Roeck authored
commit aee530cf upstream. spin_is_locked() always returns false for uniprocessor configurations in several architectures, so do not use WARN_ON with it. Use lockdep_assert_held() instead to also reduce overhead in non-debug kernels. Signed-off-by:
Guenter Roeck <linux@roeck-us.net> Signed-off-by:
Matt Fleming <matt.fleming@intel.com> Signed-off-by:
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Alex Deucher authored
commit 0e16e4cf upstream. Older firmware didn't support the new nop packet. v2 (Andreas Boll): - Drop usage of packet3 for new firmware Signed-off-by:
Alex Deucher <alexander.deucher@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> (v1) Signed-off-by:
Andreas Boll <andreas.boll.dev@gmail.com> Signed-off-by:
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Vaidyanathan Srinivasan authored
commit 6174bac8 upstream. Cpufreq depends on platform firmware to implement PStates. In case of platform firmware failure, cpufreq should not panic host kernel with BUG_ON(). Less severe pr_warn() will suffice. Add firmware_has_feature(FW_FEATURE_OPALv3) check to skip probing for device-tree on non-powernv platforms. Signed-off-by:
Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com> Acked-by:
Gautham R. Shenoy <ego@linux.vnet.ibm.com> Signed-off-by:
Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by:
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Christian Borntraeger authored
commit 36e7fdaa upstream. commit 4badad35 (locking/mutex: Disable optimistic spinning on some architectures) fenced spinning for architectures without proper cmpxchg. There is no need to disable mutex spinning on s390, though: The instructions CS,CSG and friends provide the proper guarantees. (We dont implement cmpxchg with locks). Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by:
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Mark A. Greer authored
commit 97ca0d6c upstream. Commit id 2bd16e3e (spi: omap2-mcspi: Do not configure the controller on each transfer unless needed) does its job too well so omap2_mcspi_setup_transfer() isn't called even when an SPI slave driver changes 'spi->mode'. The result is that the mode requested by the SPI slave driver never takes effect. Fix this by adding the 'mode' member to the omap2_mcspi_cs structure which holds the mode value that the hardware is configured for. When the SPI slave driver changes 'spi->mode' it will be different than the value of this new member and the SPI master driver will know that the hardware must be reconfigured (by calling omap2_mcspi_setup_transfer()). Fixes: 2bd16e3e (spi: omap2-mcspi: Do not configure the controller on each transfer unless needed) Signed-off-by:
Mark A. Greer <mgreer@animalcreek.com> Signed-off-by:
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Thomas Petazzoni authored
commit e06871cd upstream. In commit f814f9ac ("spi/orion: add device tree binding"), Device Tree support was added to the spi-orion driver. However, this commit reads the "cell-index" property, without taking into account the fact that DT properties are big-endian encoded. Since most of the platforms using spi-orion with DT have apparently not used anything but cell-index = <0>, the problem was not visible. But as soon as one starts using cell-index = <1>, the problem becomes clearly visible, as the master->bus_num gets a wrong value (actually it gets the value 0, which conflicts with the first bus that has cell-index = <0>). This commit fixes that by using of_property_read_u32() to read the property value, which does the appropriate endianness conversion when needed. Fixes: f814f9ac ("spi/orion: add device tree binding") Signed-off-by:
Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Acked-by:
Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Signed-off-by:
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Joerg Roedel authored
commit 9b29d3c6 upstream. When multiple devices are detached in __detach_device, they are also removed from the domains dev_list. This makes it unsafe to use list_for_each_entry_safe, as the next pointer might also not be in the list anymore after __detach_device returns. So just repeatedly remove the first element of the list until it is empty. Tested-by:
Marti Raudsepp <marti@juffo.org> Signed-off-by:
Joerg Roedel <jroedel@suse.de> Signed-off-by:
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Joerg Roedel authored
commit e7f9fa54 upstream. When the BUS_NOTIFY_DEL_DEVICE event is received the device might still be attached to a driver. In this case the domain can't be released as the mappings might still be in use. Defer the domain removal in this case until we receivce the BUS_NOTIFY_UNBOUND_DRIVER event. Cc: Jiang Liu <jiang.liu@linux.intel.com> Cc: David Woodhouse <dwmw2@infradead.org> Signed-off-by:
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Gavin Shan authored
commit 763fe0ad upstream. When we take full hotplug to recover from EEH errors, PCI buses could be involved. For the case, the child devices of involved PCI buses can't be attached to IOMMU group properly, which is caused by commit 3f28c5af ("powerpc/powernv: Reduce multi-hit of iommu_add_device()"). When adding the PCI devices of the newly created PCI buses to the system, the IOMMU group is expected to be added in (C). (A) fails to bind the IOMMU group because bus->is_added is false. (B) fails because the device doesn't have binding IOMMU table yet. bus->is_added is set to true at end of (C) and pdev->is_added is set to true at (D). pcibios_add_pci_devices() pci_scan_bridge() pci_scan_child_bus() pci_scan_slot() pci_scan_single_device() pci_scan_device() pci_device_add() pcibios_add_device() A: Ignore device_add() B: Ignore pcibios_fixup_bus() pcibios_setup_bus_devices() pcibios_setup_device() C: Hit pcibios_finish_adding_to_bus() pci_bus_add_devices() pci_bus_add_device() D: Add device If the parent PCI bus isn't involved in hotplug, the IOMMU group is expected to be bound in (B). (A) should fail as the sysfs entries aren't populated. The patch fixes the issue by reverting commit 3f28c5af and remove WARN_ON() in iommu_add_device() to allow calling the function even the specified device already has associated IOMMU group. Reported-by:
Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com> Signed-off-by:
Gavin Shan <gwshan@linux.vnet.ibm.com> Acked-by:
Wei Yang <weiyang@linux.vnet.ibm.com> Signed-off-by:
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Alex Williamson authored
commit c875d2c1 upstream. The user of the IOMMU API domain expects to have full control of the IOVA space for the domain. RMRRs are fundamentally incompatible with that idea. We can neither map the RMRR into the IOMMU API domain, nor can we guarantee that the device won't continue DMA with the area described by the RMRR as part of the new domain. Therefore we must prevent such devices from being used by the IOMMU API. Signed-off-by:
Alex Williamson <alex.williamson@redhat.com> Cc: David Woodhouse <dwmw2@infradead.org> Signed-off-by:
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Paul Bolle authored
commit 3c4b422a upstream. X-Patchwork-Delegate: mchehab@redhat.com Remove the CONFIG_ prefix from two Kconfig symbols in a dependency for SMS_SIANO_DEBUGFS. This prefix is invalid inside Kconfig files. Note that the current (common sense) dependency on SMS_USB_DRV and SMS_SDIO_DRV being equal ensures that SMS_SIANO_DEBUGFS will not violate its constraints. These constraint are that: - it should only be built if SMS_USB_DRV is set; - it can't be builtin if USB support is modular. So drop the dependency on SMS_USB_DRV, as it is unneeded. Fixes: 6c84b214 ("[media] sms: fix randconfig building error") Reported-by:
Martin Walch <walch.martin@web.de> Signed-off-by:
Paul Bolle <pebolle@tiscali.nl> Signed-off-by:
Mauro Carvalho Chehab <m.chehab@samsung.com> Signed-off-by:
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Laurent Pinchart authored
commit bd994ddb upstream. videobuf2 stores the driver streaming state internally in the queue in the start_streaming_called variable. The state is set right after the driver start_stream operation returns, and checked in the vb2_buffer_done() function, typically called from the frame completion interrupt handler. A race condition exists if the hardware finishes processing the first frame before the start_stream operation returns. Fix this by setting start_streaming_called to 1 before calling the start_stream operation, and resetting it to 0 if the operation fails. Signed-off-by:
Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Reviewed-by:
Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by:
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Laurent Pinchart authored
commit e51daefc upstream. The field is assigned but never read, remove it. This fixes a bug caused by the struct vb2_buffer field not being be the very first field of the vsp1_video_buffer buffer structure as required by videobuf2. Reported-by:
Takanari Hayama <taki@igel.co.jp> Signed-off-by:
Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by:
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Philipp Zabel authored
commit f17bc3f4 upstream. Since (min_row_time - crop->width) can be negative, we have to do a signed comparison here. Otherwise max_t casts the negative value to unsigned int and sets min_hblank to that invalid value. Signed-off-by:
Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by:
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Salva Peiró authored
commit f8ca6ac0 upstream. After the zeroing the whole struct struct media_entity_desc u_ent, it is no longer necessary to memset(0) its u_ent.name field. Signed-off-by:
Salva Peiró <speiro@ai2.upv.es> Signed-off-by:
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Mauro Carvalho Chehab authored
commit 64ea37bb upstream. It seems that there's a bug at au0828 hardware/firmware related to alternate setting: when the device is already at alt 5, a further call causes the URBs to receive -ESHUTDOWN. I found two different encarnations of this issue: 1) at qv4l2, it fails the second time we try to open the video screen; 2) at xawtv, when audio underrun occurs, with is very frequent, at least on my test machine. The fix is simple: just check if alt=5 before calling set_usb_interface(). Signed-off-by:
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Mauro Carvalho Chehab authored
commit 4c07e328 upstream. The programmed frequency on xc4000 is not the middle frequency, but the initial frequency on the bandwidth range. However, the DVB API works with the middle frequency. This works fine on set_frontend, as the device calculates the needed offset. However, at get_frequency(), the returned value is the initial frequency. That's generally not a big problem on most drivers, however, starting with changeset 6fe1099c, the frequency drift is taken into account at dib7000p driver. This broke support for PCTV 340e, with uses dib7000p demod and xc4000 tuner. Signed-off-by:
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Mauro Carvalho Chehab authored
commit a3eec916 upstream. The programmed frequency on xc5000 is not the middle frequency, but the initial frequency on the bandwidth range. However, the DVB API works with the middle frequency. Signed-off-by:
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Jan Kara authored
commit 01777836 upstream. If do_journal_release() races with do_journal_end() which requeues delayed works for transaction flushing, we can leave work items for flushing outstanding transactions queued while freeing them. That results in use after free and possible crash in run_timers_softirq(). Fix the problem by not requeueing works if superblock is being shut down (MS_ACTIVE not set) and using cancel_delayed_work_sync() in do_journal_release(). Signed-off-by:
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Jeff Mahoney authored
commit 27d0e5bc upstream. Commits f1f007c3 (reiserfs: balance_leaf refactor, pull out balance_leaf_insert_left) and cf22df18 (reiserfs: balance_leaf refactor, pull out balance_leaf_paste_left) missed that the `body' pointer was getting repositioned. Subsequent users of the pointer would expect it to be repositioned, and as a result, parts of the tree would get overwritten. The most common observed corruption is indirect block pointers being overwritten. Since the body value isn't actually used anymore in the called routines, we can pass back the offset it should be shifted. We constify the body and ih pointers in the balance_leaf as a mostly-free preventative measure. Reported-and-tested-by:
Jeff Chua <jeff.chua.linux@gmail.com> Signed-off-by:
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- 05 Sep, 2014 7 commits
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Greg Kroah-Hartman authored
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Greg Kroah-Hartman authored
commit a9ef803d upstream. commit bdd405d2 ("usb: hub: Prevent hub autosuspend if usbcore.autosuspend is -1") causes a build error if CONFIG_PM_RUNTIME is disabled. Fix that by doing a simple #ifdef guard around it. Reported-by:
Stephen Rothwell <sfr@canb.auug.org.au> Reported-by:
kbuild test robot <fengguang.wu@intel.com> Cc: Roger Quadros <rogerq@ti.com> Cc: Michael Welling <mwelling@emacinc.com> Cc: Alan Stern <stern@rowland.harvard.edu> Signed-off-by:
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Oleg Nesterov authored
commit 4449a51a upstream. Aleksei hit the soft lockup during reading /proc/PID/smaps. David investigated the problem and suggested the right fix. while_each_thread() is racy and should die, this patch updates vm_is_stack(). Signed-off-by:
Oleg Nesterov <oleg@redhat.com> Reported-by:
Aleksei Besogonov <alex.besogonov@gmail.com> Tested-by:
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Trond Myklebust authored
commit aee7af35 upstream. In the presence of delegations, we can no longer assume that the state->n_rdwr, state->n_rdonly, state->n_wronly reflect the open stateid share mode, and so we need to calculate the initial value for calldata->arg.fmode using the state->flags. Reported-by:
James Drews <drews@engr.wisc.edu> Fixes: 88069f77 (NFSv41: Fix a potential state leakage when...) Signed-off-by:
Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by:
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Trond Myklebust authored
commit 412f6c4c upstream. If we did an OPEN_DOWNGRADE, then the right thing to do on success, is to apply the new open mode to the struct nfs4_state. Instead, we were unconditionally clearing the state, making it appear to our state machinery as if we had just performed a CLOSE. Fixes: 226056c5 (NFSv4: Use correct locking when updating nfs4_state...) Signed-off-by:
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Trond Myklebust authored
commit f87d928f upstream. When creating a new object on the NFS server, we should not be sending posix setacl requests unless the preceding posix_acl_create returned a non-trivial acl. Doing so, causes Solaris servers in particular to return an EINVAL. Fixes: 013cdf10 (nfs: use generic posix ACL infrastructure,,,) Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1132786Signed-off-by:
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Chuck Lever authored
commit 3c45ddf8 upstream. The current code always selects XPRT_TRANSPORT_BC_TCP for the back channel, even when the forward channel was not TCP (eg, RDMA). When a 4.1 mount is attempted with RDMA, the server panics in the TCP BC code when trying to send CB_NULL. Instead, construct the transport protocol number from the forward channel transport or'd with XPRT_TRANSPORT_BC. Transports that do not support bi-directional RPC will not have registered a "BC" transport, causing create_backchannel_client() to fail immediately. Fixes: https://bugzilla.linux-nfs.org/show_bug.cgi?id=265Signed-off-by:
Chuck Lever <chuck.lever@oracle.com> Signed-off-by:
J. Bruce Fields <bfields@redhat.com> Signed-off-by:
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