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authorGoodstein, Mordechay <mordechay.goodstein@intel.com>2017-01-15 16:00:12 +0200
committerLuca Coelho <luciano.coelho@intel.com>2017-02-08 17:54:22 +0200
commit735a0045f9ea8372bcf3e599cbd3aa891a216b26 (patch)
treef78361df24149aa7b4db2dd71e0ad335a76f16c8 /include/uapi/asm-generic/int-ll64.h
parentb45242c99f503d0a526c2b1f647ad562f9cf9dd5 (diff)
iwlwifi: mvm: avoid race condition in ADD_STA.
The race happens when we send ADD_STA(auth->assoc) -> LQ_CMD between the commands the FW sometimes loses the medium for AUX, and sends a ndp to the AP and the flow becomes, ADD_STA -> send ndp -> LQ_CMD the problem is that there's no rates yet defined for sending the ndp and FW generates an assert. The fix: change the order of the commands to LQ_CMD -> ADD_STA Signed-off-by: Mordechay Goodstein <mordechay.goodstein@intel.com> Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Diffstat (limited to 'include/uapi/asm-generic/int-ll64.h')
0 files changed, 0 insertions, 0 deletions
ALL_64_fastpath+0x13/0x94 - i915 unpin_work workqueue: intel_unpin_work_fn+0x58/0x140 [i915] process_one_work+0x1f1/0x480 worker_thread+0x48/0x4d0 kthread+0x101/0x140 and this patch purely papers over the issue by adding a NULL pointer check and a WARN_ON_ONCE() to avoid the oops that would then generally make the machine unresponsive. Other callers of i915_gem_object_to_ggtt() seem to also check for the returned pointer being NULL and warn about it, so this clearly has happened before in other places. [ Reported it originally to the i915 developers on Jan 8, applying the ugly workaround on my own now after triggering the problem for the second time with no feedback. This is likely to be the same bug reported as https://bugs.freedesktop.org/show_bug.cgi?id=98829 https://bugs.freedesktop.org/show_bug.cgi?id=99134 which has a patch for the underlying problem, but it hasn't gotten to me, so I'm applying the workaround. ] Cc: Daniel Vetter <daniel.vetter@intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Imre Deak <imre.deak@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/crash_dump.c')