- 06 Oct, 2014 3 commits
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Mark Brown authored
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Mark Brown authored
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Mark Brown authored
ASoC: Fixes for v3.17 Another round of again fairly unexciting fixes - several driver fixes, an e-mail address change and a fix for error handling with DPCM. # gpg: Signature made Wed 10 Sep 2014 12:26:54 BST using RSA key ID 5D5487D0 # gpg: Good signature from "Mark Brown <broonie@sirena.org.uk>" # gpg: aka "Mark Brown <broonie@debian.org>" # gpg: aka "Mark Brown <broonie@kernel.org>" # gpg: aka "Mark Brown <broonie@tardis.ed.ac.uk>" # gpg: aka "Mark Brown <broonie@linaro.org>" # gpg: aka "Mark Brown <Mark.Brown@linaro.org>"
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- 05 Oct, 2014 2 commits
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Linus Torvalds authored
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git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsiLinus Torvalds authored
Pull SCSI fixes from James Bottomley: "This is a set of two small fixes, both to code which went in during the merge window: cxgb4i has a scheduling in atomic bug in its new ipv6 code and uas fails to work properly with the new scsi-mq code" * tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: [SCSI] uas: disable use of blk-mq I/O path [SCSI] cxgb4i: avoid holding mutex in interrupt context
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- 04 Oct, 2014 1 commit
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https://git.kernel.org/pub/scm/linux/kernel/git/josh/linuxLinus Torvalds authored
Pull kconfig fixes for tiny setups from Josh Triplett: "Two Kconfig bugfixes for 3.17 related to tinification. These fixes make the Kconfig "General Setup" menu much more usable" * tag 'tiny/kconfig-for-3.17' of https://git.kernel.org/pub/scm/linux/kernel/git/josh/linux: init/Kconfig: Fix HAVE_FUTEX_CMPXCHG to not break up the EXPERT menu init/Kconfig: Hide printk log config if CONFIG_PRINTK=n
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- 03 Oct, 2014 14 commits
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Josh Triplett authored
commit 03b8c7b6 ("futex: Allow architectures to skip futex_atomic_cmpxchg_inatomic() test") added the HAVE_FUTEX_CMPXCHG symbol right below FUTEX. This placed it right in the middle of the options for the EXPERT menu. However, HAVE_FUTEX_CMPXCHG does not depend on EXPERT or FUTEX, so Kconfig stops placing items in the EXPERT menu, and displays the remaining several EXPERT items (starting with EPOLL) directly in the General Setup menu. Since both users of HAVE_FUTEX_CMPXCHG only select it "if FUTEX", make HAVE_FUTEX_CMPXCHG itself depend on FUTEX. With this change, the subsequent items display as part of the EXPERT menu again; the EMBEDDED menu now appears as the next top-level item in the General Setup menu, which makes General Setup much shorter and more usable. Signed-off-by: Josh Triplett <josh@joshtriplett.org> Acked-by: Randy Dunlap <rdunlap@infradead.org> Cc: stable <stable@vger.kernel.org>
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Josh Triplett authored
The buffers sized by CONFIG_LOG_BUF_SHIFT and CONFIG_LOG_CPU_MAX_BUF_SHIFT do not exist if CONFIG_PRINTK=n, so don't ask about their size at all. Signed-off-by: Josh Triplett <josh@joshtriplett.org> Acked-by: Randy Dunlap <rdunlap@infradead.org> Cc: stable <stable@vger.kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linuxLinus Torvalds authored
Pull i2c fixes from Wolfram Sang: "Two i2c driver bugfixes" * 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: i2c: qup: Fix order of runtime pm initialization i2c: rk3x: fix 0 length write transfers
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Linus Torvalds authored
Merge tag 'trace-fixes-v3.17-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull trace ring buffer iterator fix from Steven Rostedt: "While testing some new changes for 3.18, I kept hitting a bug every so often in the ring buffer. At first I thought it had to do with some of the changes I was working on, but then testing something else I realized that the bug was in 3.17 itself. I ran several bisects as the bug was not very reproducible, and finally came up with the commit that I could reproduce easily within a few minutes, and without the change I could run the tests over an hour without issue. The change fit the bug and I figured out a fix. That bad commit was: Commit 651e22f2 "ring-buffer: Always reset iterator to reader page" This commit fixed a bug, but in the process created another one. It used the wrong value as the cached value that is used to see if things changed while an iterator was in use. This made it look like a change always happened, and could cause the iterator to go into an infinite loop" * tag 'trace-fixes-v3.17-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: ring-buffer: Fix infinite spin in reading buffer
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git://git.samba.org/sfrench/cifs-2.6Linus Torvalds authored
Pull cifs/smb3 fixes from Steve French: "Fix for CIFS/SMB3 oops on reconnect during readpages (3.17 regression) and for incorrectly closing file handle in symlink error cases" * 'for-linus' of git://git.samba.org/sfrench/cifs-2.6: CIFS: Fix readpages retrying on reconnects Fix problem recognizing symlinks
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git://neil.brown.name/mdLinus Torvalds authored
Pull raid5 discard fix from Neil Brown: "One fix for raid5 discard issue" * tag 'md/3.17-final-fix' of git://neil.brown.name/md: md/raid5: disable 'DISCARD' by default due to safety concerns.
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git://people.freedesktop.org/~airlied/linuxLinus Torvalds authored
Pull drm fixes from Dave Airlie: "Nothing too major or scary. One i915 regression fix, nouveau has a tmds regression fix, along with a regression fix for the runtime pm code for optimus laptops not restoring the display hw correctly" * 'drm-fixes' of git://people.freedesktop.org/~airlied/linux: drm/nouveau: make sure display hardware is reinitialised on runtime resume drm/nouveau: punt fbcon resume out to a workqueue drm/nouveau: fix regression on original nv50 board drm/nv50/disp: fix dpms regression on certain boards drm/i915: Flush the PTEs after updating them before suspend
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Jarkko Nikula authored
Commit 0bd2ac3d ("ASoC: Remove CODEC pointer from snd_soc_dapm_context") introduced regression to snd_soc_dapm_new_controls() when registering a card with card->dapm_widgets set. Call chain is: snd_soc_register_card() -> snd_soc_instantiate_card() -> snd_soc_dapm_new_controls() -> snd_soc_dapm_new_control() Null pointer dereference occurs since card->dapm context doesn't have associated component. Fix this by setting widget codec pointer conditionally. Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Acked-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Mark Brown <broonie@kernel.org>
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Christoph Hellwig authored
The uas driver uses the block layer tag for USB3 stream IDs. With blk-mq we can get larger tag numbers that the queue depth, which breaks this assumption. A fix is under way for 3.18, but sits on top of large changes so can't easily be backported. Set the disable_blk_mq path so that a uas device can't easily crash the system when using blk-mq for SCSI. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pmLinus Torvalds authored
Pull ACPI and power management fixes from Rafael Wysocki: "These are three regression fixes (cpufreq core, pcc-cpufreq, i915 / ACPI) and one trivial fix for a callback return value mismatch in the cpufreq integrator driver. Specifics: - A recent cpufreq core fix went too far and introduced a regression in the system suspend code path. Fix from Viresh Kumar. - An ACPI-related commit in the i915 driver that fixed backlight problems for some Thinkpads inadvertently broke a Dell machine (in 3.16). Fix from Aaron Lu. - The pcc-cpufreq driver was broken during the 3.15 cycle by a commit that put wait_event() under a spinlock by mistake. Fix that (Rafael J Wysocki). - The return value type of integrator_cpufreq_remove() is void, but should be int. Fix from Arnd Bergmann" * tag 'pm+acpi-3.17-final' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: cpufreq: update 'cpufreq_suspended' after stopping governors ACPI / i915: Update the condition to ignore firmware backlight change request cpufreq: integrator: fix integrator_cpufreq_remove return type cpufreq: pcc-cpufreq: Fix wait_event() under spinlock
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git://anongit.freedesktop.org/drm-intelDave Airlie authored
final regression fix for 3.17. * tag 'drm-intel-fixes-2014-10-02' of git://anongit.freedesktop.org/drm-intel: drm/i915: Flush the PTEs after updating them before suspend
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Andy Gross authored
The runtime pm calls need to be done before populating the children via the i2c_add_adapter call. If this is not done, a child can run into issues trying to do i2c read/writes due to the pm_runtime_sync failing. Signed-off-by: Andy Gross <agross@codeaurora.org> Reviewed-by: Felipe Balbi <balbi@ti.com> Acked-by: Bjorn Andersson <bjorn.andersson@sonymobile.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Cc: stable@kernel.org
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Alexandru M Stan authored
i2cdetect -q was broken (everything was a false positive, and no transfers were actually being sent over i2c). The way it works is by sending a 0 length write request and checking for NACK. This patch fixes the 0 length writes and actually sends them. Reported-by: Doug Anderson <dianders@chromium.org> Signed-off-by: Alexandru M Stan <amstan@chromium.org> Tested-by: Doug Anderson <dianders@chromium.org> Tested-by: Max Schwarz <max.schwarz@online.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Cc: stable@kernel.org
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Rafael J. Wysocki authored
* pm-cpufreq: cpufreq: update 'cpufreq_suspended' after stopping governors cpufreq: integrator: fix integrator_cpufreq_remove return type cpufreq: pcc-cpufreq: Fix wait_event() under spinlock * acpi-video: ACPI / i915: Update the condition to ignore firmware backlight change request
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- 02 Oct, 2014 20 commits
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Linus Torvalds authored
Merge fixes from Andrew Morton: "5 fixes" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: mm: page_alloc: fix zone allocation fairness on UP perf: fix perf bug in fork() MAINTAINERS: change git URL for mpc5xxx tree mm: memcontrol: do not iterate uninitialized memcgs ocfs2/dlm: should put mle when goto kill in dlm_assert_master_handler
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Johannes Weiner authored
The zone allocation batches can easily underflow due to higher-order allocations or spills to remote nodes. On SMP that's fine, because underflows are expected from concurrency and dealt with by returning 0. But on UP, zone_page_state will just return a wrapped unsigned long, which will get past the <= 0 check and then consider the zone eligible until its watermarks are hit. Commit 3a025760 ("mm: page_alloc: spill to remote nodes before waking kswapd") already made the counter-resetting use atomic_long_read() to accomodate underflows from remote spills, but it didn't go all the way with it. Make it clear that these batches are expected to go negative regardless of concurrency, and use atomic_long_read() everywhere. Fixes: 81c0a2bb ("mm: page_alloc: fair zone allocator policy") Reported-by: Vlastimil Babka <vbabka@suse.cz> Reported-by: Leon Romanovsky <leon@leon.nu> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Mel Gorman <mgorman@suse.de> Cc: <stable@vger.kernel.org> [3.12+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Peter Zijlstra authored
Oleg noticed that a cleanup by Sylvain actually uncovered a bug; by calling perf_event_free_task() when failing sched_fork() we will not yet have done the memset() on ->perf_event_ctxp[] and will therefore try and 'free' the inherited contexts, which are still in use by the parent process. This is bad.. Suggested-by: Oleg Nesterov <oleg@redhat.com> Reported-by: Oleg Nesterov <oleg@redhat.com> Reported-by: Sylvain 'ythier' Hitier <sylvain.hitier@gmail.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Anatolij Gustschin authored
The repository for mpc5xxx has been moved, update git URL to new location. Signed-off-by: Anatolij Gustschin <agust@denx.de> Cc: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Johannes Weiner authored
The cgroup iterators yield css objects that have not yet gone through css_online(), but they are not complete memcgs at this point and so the memcg iterators should not return them. Commit d8ad3055 ("mm/memcg: iteration skip memcgs not yet fully initialized") set out to implement exactly this, but it uses CSS_ONLINE, a cgroup-internal flag that does not meet the ordering requirements for memcg, and so the iterator may skip over initialized groups, or return partially initialized memcgs. The cgroup core can not reasonably provide a clear answer on whether the object around the css has been fully initialized, as that depends on controller-specific locking and lifetime rules. Thus, introduce a memcg-specific flag that is set after the memcg has been initialized in css_online(), and read before mem_cgroup_iter() callers access the memcg members. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Tejun Heo <tj@kernel.org> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: Hugh Dickins <hughd@google.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: <stable@vger.kernel.org> [3.12+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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alex chen authored
In dlm_assert_master_handler, the mle is get in dlm_find_mle, should be put when goto kill, otherwise, this mle will never be released. Signed-off-by: Alex Chen <alex.chen@huawei.com> Reviewed-by: Joseph Qi <joseph.qi@huawei.com> Reviewed-by: joyce.xue <xuejiufei@huawei.com> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-mediaLinus Torvalds authored
Pull media fix from Mauro Carvalho Chehab: "One last time regression fix at em28xx. The removal of .reset_resume broke suspend/resume on this driver for some devices. There are more fixes to be done for em28xx suspend/resume to be better handled, but I'm opting to let them to stay for a while at the media devel tree, in order to get more tests. So, for now, let's just revert this patch" * tag 'media/v3.17-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: Revert "[media] media: em28xx - remove reset_resume interface"
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Steven Rostedt (Red Hat) authored
Commit 651e22f2 "ring-buffer: Always reset iterator to reader page" fixed one bug but in the process caused another one. The reset is to update the header page, but that fix also changed the way the cached reads were updated. The cache reads are used to test if an iterator needs to be updated or not. A ring buffer iterator, when created, disables writes to the ring buffer but does not stop other readers or consuming reads from happening. Although all readers are synchronized via a lock, they are only synchronized when in the ring buffer functions. Those functions may be called by any number of readers. The iterator continues down when its not interrupted by a consuming reader. If a consuming read occurs, the iterator starts from the beginning of the buffer. The way the iterator sees that a consuming read has happened since its last read is by checking the reader "cache". The cache holds the last counts of the read and the reader page itself. Commit 651e22f2 changed what was saved by the cache_read when the rb_iter_reset() occurred, making the iterator never match the cache. Then if the iterator calls rb_iter_reset(), it will go into an infinite loop by checking if the cache doesn't match, doing the reset and retrying, just to see that the cache still doesn't match! Which should never happen as the reset is suppose to set the cache to the current value and there's locks that keep a consuming reader from having access to the data. Fixes: 651e22f2 "ring-buffer: Always reset iterator to reader page" Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linuxLinus Torvalds authored
Pull parisc fix from Helge Deller: "One late but trivial patch to fix the serial console on parisc machines which got broken during the 3.17 release cycle" * 'parisc-3.17-8' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Fix serial console for machines with serial port on superio chip
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Pavel Shilovsky authored
If we got a reconnect error from async readv we re-add pages back to page_list and continue loop. That is wrong because these pages have been already added to the pagecache but page_list has pages that have not been added to the pagecache yet. This ends up with a general protection fault in put_pages after readpages. Fix it by not retrying the read of these pages and falling back to readpage instead. Fixes debian bug 762306 Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <smfrench@gmail.com> Tested-by: Arthur Marsh <arthur.marsh@internode.on.net>
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Steve French authored
Changeset eb85d94b introduced a problem where if a cifs open fails during query info of a file we will still try to close the file (happens with certain types of reparse points) even though the file handle is not valid. In addition for SMB2/SMB3 we were not mapping the return code returned by Windows when trying to open a file (like a Windows NFS symlink) which is a reparse point. Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org> CC: stable <stable@vger.kernel.org> #v3.13+
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Linus Torvalds authored
Merge NUMA balancing related fixlets from Mel Gorman: "There were a few minor changes so am resending just the two patches that are mostly likely to affect the bug Dave and Sasha saw and marked them for stable. I'm less confident it will address Sasha's problem because while I have not kept up to date, I believe he's also seeing memory corruption issues in next from an unknown source. Still, it would be nice to see how they affect trinity testing. I'll send the MPOL_MF_LAZY patch separately because it's not urgent" * emailed patches from Mel Gorman <mgorman@suse.de>: mm: numa: Do not mark PTEs pte_numa when splitting huge pages mm: migrate: Close race between migration completion and mprotect
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Mel Gorman authored
This patch reverts 1ba6e0b5 ("mm: numa: split_huge_page: transfer the NUMA type from the pmd to the pte"). If a huge page is being split due a protection change and the tail will be in a PROT_NONE vma then NUMA hinting PTEs are temporarily created in the protected VMA. VM_RW|VM_PROTNONE |-----------------| ^ split here In the specific case above, it should get fixed up by change_pte_range() but there is a window of opportunity for weirdness to happen. Similarly, if a huge page is shrunk and split during a protection update but before pmd_numa is cleared then a pte_numa can be left behind. Instead of adding complexity trying to deal with the case, this patch will not mark PTEs NUMA when splitting a huge page. NUMA hinting faults will not be triggered which is marginal in comparison to the complexity in dealing with the corner cases during THP split. Cc: stable@vger.kernel.org Signed-off-by: Mel Gorman <mgorman@suse.de> Acked-by: Rik van Riel <riel@redhat.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Mel Gorman authored
A migration entry is marked as write if pte_write was true at the time the entry was created. The VMA protections are not double checked when migration entries are being removed as mprotect marks write-migration-entries as read. It means that potentially we take a spurious fault to mark PTEs write again but it's straight-forward. However, there is a race between write migrations being marked read and migrations finishing. This potentially allows a PTE to be write that should have been read. Close this race by double checking the VMA permissions using maybe_mkwrite when migration completes. [torvalds@linux-foundation.org: use maybe_mkwrite] Cc: stable@vger.kernel.org Signed-off-by: Mel Gorman <mgorman@suse.de> Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/soundLinus Torvalds authored
Pull sound fixes from Takashi Iwai: "Just a few pending bits of random fixes in ASoC. Nothing exciting, but would be nice to be merged in 3.17, as most of them are also for stable kernels" * tag 'sound-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: ASoC: ssm2602: do not hardcode type to SSM2602 ASoC: core: fix possible ZERO_SIZE_PTR pointer dereferencing error. MAINTAINERS: add atmel audio alsa driver maintainer entry ASoC: rt286: Fix sync function ASoC: rt286: Correct default value ASoC: soc-compress: fix double unlock of fe card mutex ASoC: fsl_ssi: fix kernel panic in probe function
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git://anongit.freedesktop.org/git/nouveau/linux-2.6Dave Airlie authored
A few regression fixes, the runpm ones dating back to 3.15. Also a fairly severe TMDS regression that effected a lot of GF8/9/GT2xx users. * 'linux-3.17' of git://anongit.freedesktop.org/git/nouveau/linux-2.6: drm/nouveau: make sure display hardware is reinitialised on runtime resume drm/nouveau: punt fbcon resume out to a workqueue drm/nouveau: fix regression on original nv50 board drm/nv50/disp: fix dpms regression on certain boards
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git://git.kernel.org/pub/scm/linux/kernel/git/davem/netLinus Torvalds authored
Pull networking fixes from David Miller: 1) Don't halt the firmware in r8152 driver, from Hayes Wang. 2) Handle full sized 802.1ad frames in bnx2 and tg3 drivers properly, from Vlad Yasevich. 3) Don't sleep while holding tx_clean_lock in netxen driver, fix from Manish Chopra. 4) Certain kinds of ipv6 routes can end up endlessly failing the route validation test, causing it to be re-looked up over and over again. This particularly kills input route caching in TCP sockets. Fix from Hannes Frederic Sowa. 5) netvsc_start_xmit() has a use-after-free access to skb->len, fix from K Y Srinivasan. 6) Fix matching of inverted containers in ematch module, from Ignacy Gawędzki. 7) Aggregation of GRO frames via SKB ->frag_list for linear skbs isn't handled properly, regression fix from Eric Dumazet. 8) Don't test return value of ipv4_neigh_lookup(), which returns an error pointer, against NULL. From WANG Cong. 9) Fix an old regression where we mistakenly allow a double add of the same tunnel. Fixes from Steffen Klassert. 10) macvtap device delete and open can run in parallel and corrupt lists etc., fix from Vlad Yasevich. 11) Fix build error with IPV6=m NETFILTER_XT_TARGET_TPROXY=y, from Pablo Neira Ayuso. 12) rhashtable_destroy() triggers lockdep splats, fix also from Pablo. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (32 commits) bna: Update Maintainer Email r8152: disable power cut for RTL8153 r8152: remove clearing bp bnx2: Correctly receive full sized 802.1ad fragmes tg3: Allow for recieve of full-size 8021AD frames r8152: fix setting RTL8152_UNPLUG netxen: Fix bug in Tx completion path. netxen: Fix BUG "sleeping function called from invalid context" ipv6: remove rt6i_genid hyperv: Fix a bug in netvsc_start_xmit() net: stmmac: fix stmmac_pci_probe failed when CONFIG_HAVE_CLK is selected ematch: Fix matching of inverted containers. gro: fix aggregation for skb using frag_list neigh: check error pointer instead of NULL for ipv4_neigh_lookup() ip6_gre: Return an error when adding an existing tunnel. ip6_vti: Return an error when adding an existing tunnel. ip6_tunnel: Return an error when adding an existing tunnel. ip6gre: add a rtnl link alias for ip6gretap net/mlx4_core: Allow not to specify probe_vf in SRIOV IB mode r8152: fix the carrier off when autoresuming ...
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NeilBrown authored
It has come to my attention (thanks Martin) that 'discard_zeroes_data' is only a hint. Some devices in some cases don't do what it says on the label. The use of DISCARD in RAID5 depends on reads from discarded regions being predictably zero. If a write to a previously discarded region performs a read-modify-write cycle it assumes that the parity block was consistent with the data blocks. If all were zero, this would be the case. If some are and some aren't this would not be the case. This could lead to data corruption after a device failure when data needs to be reconstructed from the parity. As we cannot trust 'discard_zeroes_data', ignore it by default and so disallow DISCARD on all raid4/5/6 arrays. As many devices are trustworthy, and as there are benefits to using DISCARD, add a module parameter to over-ride this caution and cause DISCARD to work if discard_zeroes_data is set. If a site want to enable DISCARD on some arrays but not on others they should select DISCARD support at the filesystem level, and set the raid456 module parameter. raid456.devices_handle_discard_safely=Y As this is a data-safety issue, I believe this patch is suitable for -stable. DISCARD support for RAID456 was added in 3.7 Cc: Shaohua Li <shli@kernel.org> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Cc: Mike Snitzer <snitzer@redhat.com> Cc: Heinz Mauelshagen <heinzm@redhat.com> Cc: stable@vger.kernel.org (3.7+) Acked-by: Martin K. Petersen <martin.petersen@oracle.com> Acked-by: Mike Snitzer <snitzer@redhat.com> Fixes: 620125f2Signed-off-by: NeilBrown <neilb@suse.de>
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Ben Skeggs authored
Linus commit 05c63c2f modified the runtime suspend/resume paths to skip over display-related tasks to avoid locking issues on resume. Unfortunately, this resulted in the display hardware being left in a partially initialised state, preventing subsequent modesets from completing. This commit unifies the (many) suspend/resume paths, bringing back display (and fbcon) handling in the runtime paths. Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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Ben Skeggs authored
Preparation for some runtime pm fixes. Currently we skip over fbcon suspend/resume in the runtime path, which causes issues on resume if fbcon tries to write to the framebuffer before the BAR subdev has been resumed to restore the BAR1 VM setup. As we might be woken up via a sysfs connector, we are unable to call fb_set_suspend() in the resume path as it could make its way down to a modeset and cause all sorts of locking hilarity. To solve this, we'll just delay the fbcon resume to a workqueue. Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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