Pull drm fixes from Dave Airlie:
 "One nouveau deadlock fix, one qxl irq handling fix, and a set of
  radeon pageflipping changes that fix regressions in pageflipping since
  -rc1 along with a leak and backlight fix.

  The pageflipping fixes are a bit bigger than I'd like, but there has
  been a few people focused on testing them"

* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
  drm/radeon: Make classic pageflip completion path less racy.
  drm/radeon: Add missing vblank_put in pageflip ioctl error path.
  drm/radeon: Remove redundant fence unref in pageflip path.
  drm/radeon: Complete page flip even if waiting on the BO fence fails
  drm/radeon: Move pinning the BO back to radeon_crtc_page_flip()
  drm/radeon: Prevent too early kms-pageflips triggered by vblank.
  drm/radeon: set default bl level to something reasonable
  drm/radeon: avoid leaking edid data
  drm/qxl: return IRQ_NONE if it was not our irq
  drm/nouveau/therm: fix a potential deadlock in the therm monitoring code

Pull /dev/random fix from Ted Ts'o:
 "Fix a BUG splat found by trinity"

* tag 'random_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random:
  random: check for increase of entropy_count because of signed conversion

Pull crypto fixes from Herbert Xu:
 "This push fixes a boot hang in virt guests when the virtio RNG is
  enabled"

* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  hwrng: virtio - ensure reads happen after successful probe
  hwrng: fetch randomness only after device init

The expression entropy_count -= ibytes << (ENTROPY_SHIFT + 3) could
actually increase entropy_count if during assignment of the unsigned
expression on the RHS (mind the -=) we reduce the value modulo
2^width(int) and assign it to entropy_count. Trinity found this.

[ Commit modified by tytso to add an additional safety check for a
  negative entropy_count -- which should never happen, and to also add
  an additional paranoia check to prevent overly large count values to
  be passed into urandom_read().  ]
Reported-by: NDave Jones <davej@redhat.com>
Signed-off-by: NHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org

Pull gfs2 fixes from Steven Whitehouse:
 "This patch set contains two minor docs/spelling fixes, some fixes for
  flock, a change to use GFP_NOFS to avoid recursion on a rarely used
  code path and a fix for a race relating to the glock lru"

* tag 'gfs2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-fixes:
  GFS2: fs/gfs2/rgrp.c: kernel-doc warning fixes
  GFS2: memcontrol: Spelling s/invlidate/invalidate/
  GFS2: Allow caching of glocks for flock
  GFS2: Allow flocks to use normal glock dq rather than dq_wait
  GFS2: replace count*size kzalloc by kcalloc
  GFS2: Use GFP_NOFS when allocating glocks
  GFS2: Fix race in glock lru glock disposal
  GFS2: Only wait for demote when last holder is dequeued

Pull device mapper fixes from Mike Snitzer:
 "Fix the dm-thinp and dm-cache targets to disallow changing the data
  device's block size"

* tag 'dm-3.16-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm cache metadata: do not allow the data block size to change
  dm thin metadata: do not allow the data block size to change

Pull UBI fixes from Artem Bityutskiy:
 "Two UBI fastmap-related fixes for v3.16:

   - fix UBI fastmap support which we broke in 3.16-rc1 by reversing the
     volumes RB-tree sorting criteria.
   - make sure that we scrub all PEBs where we see bit-flips - we were
     missing some of them when the fastmap feature was enabled"

* tag 'upstream-3.16-rc6' of git://git.infradead.org/linux-ubifs:
  UBI: fastmap: do not miss bit-flips
  UBI: fix the volumes tree sorting criteria

Pull xfs fixes from Dave Chinner:
 "Fixes for low memory perforamnce regressions and a quota inode
  handling regression.

  These are regression fixes for issues recently introduced - the change
  in the stack switch location is fairly important, so I've held off
  sending this update until I was sure that it still addresses the stack
  usage problem the original solved.  So while the commits in the xfs
  tree are recent, it has been under tested for several weeks now"

* tag 'xfs-for-linus-3.16-rc5' of git://oss.sgi.com/xfs/xfs:
  xfs: null unused quota inodes when quota is on
  xfs: refine the allocation stack switch
  Revert "xfs: block allocation work needs to be kswapd aware"

Cc: cluster-devel@redhat.com
Signed-off-by: NFabian Frederick <fabf@skynet.be>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Cc: cluster-devel@redhat.com
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

This patch removes the GLF_NOCACHE flag from the glocks associated with
flocks. There should be no good reason not to cache glocks for flocks:
they only force the glock to be demoted before they can be reacquired,
which can slow down performance and even cause glock hangs, especially
in cases where the flocks are held in Shared (SH) mode.
Signed-off-by: NBob Peterson <rpeterso@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

This patch allows flock glocks to use a non-blocking dequeue rather
than dq_wait. It also reverts the previous patch I had posted regarding
dq_wait. The reverted patch isn't necessarily a bad idea, but I decided
this might avoid unforeseen side effects, and was therefore safer.
Signed-off-by: NBob Peterson <rpeterso@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

kcalloc manages count*sizeof overflow.

Cc: cluster-devel@redhat.com
Signed-off-by: NFabian Frederick <fabf@skynet.be>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

Normally GFP_KERNEL is ok here, but there is now a rarely used code path
relating to deallocation of unlinked inodes (in certain corner cases)
which if hit at times of memory shortage can cause recursion while
trying to free memory.

One solution would be to try and move the gfs2_glock_get() call so
that it is no longer called while another glock is held, but that
doesn't look at all easy, so GFP_NOFS is the best solution for the
time being.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

We must not leave items on the LRU list with GLF_LOCK set, since
they can be removed if the glock is brought back into use, which
may then potentially result in a hang, waiting for GLF_LOCK to
clear.

It doesn't happen very often, since it requires a glock that has
not been used for a long time to be brought back into use at the
same moment that the shrinker is part way through disposing of
glocks.

The fix is to set GLF_LOCK at a later time, when we already know
that the other locks can be obtained. Also, we now only release
the lru_lock in case a resched is needed, rather than on every
iteration.
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

Function gfs2_glock_dq_wait is supposed to dequeue a glock and then
wait for the lock to be demoted. The problem is, if this is a shared
lock, its demote will depend on the other holders, which means you
might end up waiting forever because the other process is blocked.
This problem is especially apparent when dealing with nested flocks.
Signed-off-by: NBob Peterson <rpeterso@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

A few more fixes for 3.16.  The pageflipping fixes I dropped last week
have finally shaped up so this is mostly fixes for fallout from the
pageflipping code changes.  Also fix a memory leak and a black screen
when restoring the backlight on console unblanking.

* 'drm-fixes-3.16' of git://people.freedesktop.org/~agd5f/linux:
  drm/radeon: Make classic pageflip completion path less racy.
  drm/radeon: Add missing vblank_put in pageflip ioctl error path.
  drm/radeon: Remove redundant fence unref in pageflip path.
  drm/radeon: Complete page flip even if waiting on the BO fence fails
  drm/radeon: Move pinning the BO back to radeon_crtc_page_flip()
  drm/radeon: Prevent too early kms-pageflips triggered by vblank.
  drm/radeon: set default bl level to something reasonable
  drm/radeon: avoid leaking edid data

Pull Xen fixes from Konrad Rzeszutek Wilk:
 "Two fixes found during migration of PV guests.  David would be the one
  doing this pull but he is on vacation.

  Fixes:
   - fix console deadlock when resuming PV guests
   - fix regression hit when ballooning and resuming PV guests"

* tag 'stable/for-linus-3.16-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/balloon: set ballooned out pages as invalid in p2m
  xen/manage: fix potential deadlock when resuming the console

Merge tag 'trace-fixes-v3.16-rc5-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing fixes from Steven Rostedt:
 "A few more fixes for ftrace infrastructure.

  I was cleaning out my INBOX and found two fixes from zhangwei from a
  year ago that were lost in my mail.  These fix an inconsistency
  between trace_puts() and the way trace_printk() works.  The reason
  this is important to fix is because when trace_printk() doesn't have
  any arguments, it turns into a trace_puts().  Not being able to enable
  a stack trace against trace_printk() because it does not have any
  arguments is quite confusing.  Also, the fix is rather trivial and low
  risk.

  While porting some changes to PowerPC I discovered that it still has
  the function graph tracer filter bug that if you also enable stack
  tracing the function graph tracer filter is ignored.  I fixed that up.

  Finally, Martin Lau, fixed a bug that would cause readers of the
  ftrace ring buffer to block forever even though it was suppose to be
  NONBLOCK"

This also includes the fix from an earlier pull request:

 "Oleg Nesterov fixed a memory leak that happens if a user creates a
  tracing instance, sets up a filter in an event, and then removes that
  instance.  The filter allocates memory that is never freed when the
  instance is destroyed"

* tag 'trace-fixes-v3.16-rc5-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  ring-buffer: Fix polling on trace_pipe
  tracing: Add TRACE_ITER_PRINTK flag check in __trace_puts/__trace_bputs
  tracing: Fix graph tracer with stack tracer on other archs
  tracing: Add ftrace_trace_stack into __trace_puts/__trace_bputs
  tracing: instance_rmdir() leaks ftrace_event_file->filter

Need to protect mmio flip programming by event lock as well.

Need to also first enable pflip irq, then mmio program,
otherwise a flip completion may get unnoticed in the vblank
of actual completion if the flip is programmed, but
radeon_flip_work_func gets preempted immediately after
mmio programming and before vblank. In that case the
vblank irq handler wouldn't run radeon_crtc_handle_vblank()
with the completion check routine, miss the completed flip,
and only notice one vblank after actual completion, causing
a false/delayed report of flip completion.
Signed-off-by: NMario Kleiner <mario.kleiner.de@gmail.com>
Reviewed-by: NMichel Dänzer <michel.daenzer@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

Signed-off-by: NMario Kleiner <mario.kleiner.de@gmail.com>
Reviewed-by: NMichel Dänzer <michel.daenzer@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

Not needed anymore, as it is already unreffed within
radeon_flip_work_func() after its only use.
Signed-off-by: NMario Kleiner <mario.kleiner.de@gmail.com>
Reviewed-by: NMichel Dänzer <michel.daenzer@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

Otherwise the DRM core and userspace will be confused about which BO the
CRTC is scanning out.
Reviewed-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NMichel Dänzer <michel.daenzer@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

As well as enabling the vblank interrupt. These shouldn't take any
significant amount of time, but at least pinning the BO has actually been
seen to fail in practice before, in which case we need to let userspace
know about it.
Reviewed-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NMichel Dänzer <michel.daenzer@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

Since 3.16-rc1 we have this new failure:

When the userspace XOrg ddx schedules vblank events to
trigger deferred kms-pageflips, e.g., via the OML_sync_control
extension call glXSwapBuffersMscOML(), or if a glXSwapBuffers()
is called immediately after completion of a previous swapbuffers
call, e.g., in a tight rendering loop with minimal rendering,
it happens frequently that the pageflip ioctl() is executed
within the same vblank in which a previous kms-pageflip completed,
or - for deferred swaps - always one vblank earlier than requested
by the client app.

This causes premature pageflips and detection of failure by
the ddx, e.g., XOrg log warnings like...

"(WW) RADEON(1): radeon_dri2_flip_event_handler: Pageflip
completion event has impossible msc 201025 < target_msc 201026"

... and error/invalid return values of glXWaitForSbcOML() and
Intel_swap_events extension.

Reason is the new way in which kms-pageflips are programmed
since 3.16.

This commit changes the time window in which the hw can
execute pending programmed pageflips. Before, a pending flip
would get executed anywhere within the vblank interval. Now
a pending flip only gets executed at the leading edge of
vblank (start of front porch), making sure that a invocation
of the pageflip ioctl() within a given vblank interval will
only lead to pageflip completion in the following vblank.

Tested to death on a DCE-4 card.
Signed-off-by: NMario Kleiner <mario.kleiner.de@gmail.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

If the value in the scratch register is 0, set it to the
max level.  This fixes an issue where the console fb blanking
code calls back into the backlight driver on unblank and then
sets the backlight level to 0 after the driver has already
set the mode and enabled the backlight.

bugs:
https://bugs.freedesktop.org/show_bug.cgi?id=81382
https://bugs.freedesktop.org/show_bug.cgi?id=70207Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Tested-by: NDavid Heidelberger <david.heidelberger@ixit.cz>
Cc: stable@vger.kernel.org

In some cases we fetch the edid in the detect() callback
in order to determine what sort of monitor is connected.
If that happens, don't fetch the edid again in the get_modes()
callback or we will leak the edid.
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

Return IRQ_NONE if it was not our irq. This is necessary for the case
when qxl is sharing irq line with a device A in a crash kernel. If qxl
is initialized before A and A's irq was raised during this gap,
returning IRQ_HANDLED in this case will cause this irq to be raised
again after EOI since kernel think it was handled but in fact it was
not.

Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: NJason Wang <jasowang@redhat.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Pull MTD fixes from Brian Norris:

 - Fix ELM suspend/resume

 - Reduce warnings if NAND ECC is too weak

 - Add CFI support for Sharp LH28F640BF NOR

   The last fix is coming in because other commits in the 3.16 cycle
   depended on this support.

* tag 'for-linus-20140716' of git://git.infradead.org/linux-mtd:
  mtd: cfi_cmdset_0001.c: add support for Sharp LH28F640BF NOR
  mtd: nand: reduce the warning noise when the ECC is too weak
  mtd: devices: elm: fix elm_context_save() and elm_context_restore() functions

Pull scheduler fixes from Ingo Molnar:
 "A cpufreq lockup fix and a compiler warning fix"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched: Fix compiler warnings
  x86, tsc: Fix cpufreq lockup

Pull perf fixes from Ingo Molnar:
 "Tooling fixes and an Intel PMU driver fixlet"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf: Do not allow optimized switch for non-cloned events
  perf/x86/intel: ignore CondChgd bit to avoid false NMI handling
  perf symbols: Get kernel start address by symbol name
  perf tools: Fix segfault in cumulative.callchain report

Pull sound fixes from Takashi Iwai:
 "Things seem to calm down so far, just a small few HD-audio fixes
  (regression fixes and a new codec ID addition) popping up"

* tag 'sound-3.16-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: hda - Fix broken PM due to incomplete i915 initialization
  ALSA: hda - Revert stream assignment order for Intel controllers
  ALSA: hda - Add new GPU codec ID 0x10de0070 to snd-hda
  ALSA: hda: Fix build warning

The return value from 'ubi_io_read_ec_hdr()' was stored in 'err', not in 'ret'.
This fix makes sure Fastmap-enabled UBI does not miss bit-flip while reading EC
headers, events and scrubs the affected PEBs.

This issue was reported by Coverity Scan.

Artem: improved the commit message.
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>
Acked-by: NRichard Weinberger <richard@nod.at>
Signed-off-by: NArtem Bityutskiy <artem.bityutskiy@linux.intel.com>

Pull quota fix from Jan Kara:
 "Fix locking of dquot shrinker"

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  quota: missing lock in dqcache_shrink_scan()

Pull GPIO fix from Linus Walleij:
 "Fix up some merge confusion from the merge window"

* tag 'gpio-v3.16-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
  gpio: mcp23s08: Eliminates redundant checking.

ring_buffer_poll_wait() should always put the poll_table to its wait_queue
even there is immediate data available.  Otherwise, the following epoll and
read sequence will eventually hang forever:

1. Put some data to make the trace_pipe ring_buffer read ready first
2. epoll_ctl(efd, EPOLL_CTL_ADD, trace_pipe_fd, ee)
3. epoll_wait()
4. read(trace_pipe_fd) till EAGAIN
5. Add some more data to the trace_pipe ring_buffer
6. epoll_wait() -> this epoll_wait() will block forever

~ During the epoll_ctl(efd, EPOLL_CTL_ADD,...) call in step 2,
  ring_buffer_poll_wait() returns immediately without adding poll_table,
  which has poll_table->_qproc pointing to ep_poll_callback(), to its
  wait_queue.
~ During the epoll_wait() call in step 3 and step 6,
  ring_buffer_poll_wait() cannot add ep_poll_callback() to its wait_queue
  because the poll_table->_qproc is NULL and it is how epoll works.
~ When there is new data available in step 6, ring_buffer does not know
  it has to call ep_poll_callback() because it is not in its wait queue.
  Hence, block forever.

Other poll implementation seems to call poll_wait() unconditionally as the very
first thing to do.  For example, tcp_poll() in tcp.c.

Link: http://lkml.kernel.org/p/20140610060637.GA14045@devbig242.prn2.facebook.com

Cc: stable@vger.kernel.org # 2.6.27
Fixes: 2a2cc8f7 "ftrace: allow the event pipe to be polled"
Reviewed-by: NChris Mason <clm@fb.com>
Signed-off-by: NMartin Lau <kafai@fb.com>
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>

Commit 1ab6c499 (fs: convert fs shrinkers to new scan/count API)
accidentally removed locking from quota shrinker. Fix it -
dqcache_shrink_scan() should use dq_list_lock to protect the
scan on free_dquots list.

CC: stable@vger.kernel.org
Fixes: 1ab6c499Signed-off-by: NNiu Yawei <yawei.niu@intel.com>
Signed-off-by: NJan Kara <jack@suse.cz>

The block size for the dm-cache's data device must remained fixed for
the life of the cache.  Disallow any attempt to change the cache's data
block size.
Signed-off-by: NMike Snitzer <snitzer@redhat.com>
Acked-by: NJoe Thornber <ejt@redhat.com>
Cc: stable@vger.kernel.org

The block size for the thin-pool's data device must remained fixed for
the life of the thin-pool.  Disallow any attempt to change the
thin-pool's data block size.

It should be noted that attempting to change the data block size via
thin-pool table reload will be ignored as a side-effect of the thin-pool
handover that the thin-pool target does during thin-pool table reload.

Here is an example outcome of attempting to load a thin-pool table that
reduced the thin-pool's data block size from 1024K to 512K.

Before:
kernel: device-mapper: thin: 253:4: growing the data device from 204800 to 409600 blocks

After:
kernel: device-mapper: thin metadata: changing the data block size (from 2048 to 1024) is not supported
kernel: device-mapper: table: 253:4: thin-pool: Error creating metadata object
kernel: device-mapper: ioctl: error adding target to table
Signed-off-by: NMike Snitzer <snitzer@redhat.com>
Acked-by: NJoe Thornber <ejt@redhat.com>
Cc: stable@vger.kernel.org

The TRACE_ITER_PRINTK check in __trace_puts/__trace_bputs is missing,
so add it, to be consistent with __trace_printk/__trace_bprintk.
Those functions are all called by the same function: trace_printk().

Link: http://lkml.kernel.org/p/51E7A7D6.8090900@huawei.com

Cc: stable@vger.kernel.org # 3.11+
Signed-off-by: Nzhangwei(Jovi) <jovi.zhangwei@huawei.com>
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>