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linux-pinenote/drivers/gpu/drm/i915
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Chris Wilson 226e5ae9e5 drm/i915: Fix mutex->owner inspection race under DEBUG_MUTEXES 
If CONFIG_DEBUG_MUTEXES is set, the mutex->owner field is only cleared
if the mutex debugging is enabled which introduces a race in our
mutex_is_locked_by() - i.e. we may inspect the old owner value before it
is acquired by the new task.

This is the root cause of this error:

 diff --git a/kernel/locking/mutex-debug.c b/kernel/locking/mutex-debug.c
 index 5cf6731..3ef3736 100644
 --- a/kernel/locking/mutex-debug.c
 +++ b/kernel/locking/mutex-debug.c
 @@ -80,13 +80,13 @@ void debug_mutex_unlock(struct mutex *lock)
 			DEBUG_LOCKS_WARN_ON(lock->owner != current);

 		DEBUG_LOCKS_WARN_ON(!lock->wait_list.prev && !lock->wait_list.next);
 -		mutex_clear_owner(lock);
 	}

 	/*
 	 * __mutex_slowpath_needs_to_unlock() is explicitly 0 for debug
 	 * mutexes so that we can do it here after we've verified state.
 	 */
 +	mutex_clear_owner(lock);
 	atomic_set(&lock->count, 1);
  }

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=87955
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@vger.kernel.org
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
2015-01-12 10:53:02 +02:00
..
dvo.h
dvo_ch7xxx.c
dvo_ch7017.c
dvo_ivch.c
dvo_ns2501.c drm/i915: Check pixel clock in ns2501 mode_valid hook 2014-09-03 11:05:21 +02:00
dvo_sil164.c
dvo_tfp410.c
i915_cmd_parser.c drm/i915: Add the predicate source registers to the register whitelist 2014-11-14 10:29:24 +01:00
i915_debugfs.c drm/i915: Handle runtime pm in the CRC setup code 2014-12-03 09:29:40 +01:00
i915_dma.c Linux 3.18-rc7 2014-12-02 10:58:33 +10:00
i915_drv.c Revert "drm/gem: Warn on illegal use of the dumb buffer interface v2" 2014-12-24 13:13:22 +10:00
i915_drv.h Merge tag 'drm-intel-next-fixes-2014-12-30' of git://anongit.freedesktop.org/drm-intel into linus 2015-01-04 17:41:00 +10:00
i915_gem.c drm/i915: Fix mutex->owner inspection race under DEBUG_MUTEXES 2015-01-12 10:53:02 +02:00
i915_gem_context.c drm/i915: Disable PSMI sleep messages on all rings around context switches 2014-12-16 15:07:53 +02:00
i915_gem_debug.c
i915_gem_dmabuf.c
i915_gem_evict.c drm/i915: fix another use-after-free in i915_gem_evict_everything 2014-09-19 14:41:16 +02:00
i915_gem_execbuffer.c Revert "drm/gem: Warn on illegal use of the dumb buffer interface v2" 2014-12-24 13:13:22 +10:00
i915_gem_gtt.c Linux 3.18-rc7 2014-12-02 10:58:33 +10:00
i915_gem_gtt.h drm/i915: Can i915_gem_init_ioctl 2014-11-20 13:03:31 +01:00
i915_gem_render_state.c drm/i915 Add golden context support for Gen9 2014-11-04 14:04:55 +01:00
i915_gem_render_state.h drm/i915/bdw: Render state init for Execlists 2014-09-03 11:04:52 +02:00
i915_gem_stolen.c drm/i915: Don't complain about stolen conflicts on gen3 2014-12-10 11:11:28 +02:00
i915_gem_tiling.c Linux 3.18-rc7 2014-12-02 10:58:33 +10:00
i915_gem_userptr.c drm/i915: Do not leak pages when freeing userptr objects 2014-09-29 15:31:01 +02:00
i915_gpu_error.c drm/i915: Use ggtt error obj capture helper for gen8 semaphores 2014-11-20 16:59:49 +01:00
i915_ioc32.c drm/i915: remove redundant #ifdef CONFIG_COMPAT 2014-10-24 16:34:07 +02:00
i915_irq.c drm/i915: vlv: sanitize RPS interrupt mask during GPU idling 2015-01-12 10:52:41 +02:00
i915_params.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2014-10-14 09:39:08 +02:00
i915_reg.h drm/i915: Disable PSMI sleep messages on all rings around context switches 2014-12-16 15:07:53 +02:00
i915_suspend.c drm/i915: save/restore GMBUS freq across suspend/resume on gen4 2014-12-11 15:31:59 +02:00
i915_sysfs.c drm/i915: Do not export RC6p and RC6pp if they don't exist 2014-10-24 16:34:00 +02:00
i915_trace.h drm/i915: Add tracepoints to track a vm during its lifetime 2014-11-14 10:29:13 +01:00
i915_trace_points.c
i915_ums.c drm/i915: don't save/restore backlight hist ctl registers 2014-11-14 10:29:28 +01:00
intel_acpi.c
intel_audio.c drm/i915/audio: fix monitor presence indication after disable 2014-11-18 11:17:37 +01:00
intel_bios.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2014-10-14 09:39:08 +02:00
intel_bios.h drm/i915/bios: add missing __packed to structs used for reading vbt 2014-09-19 14:43:14 +02:00
intel_crt.c drm/i915: Don't claim that we're resetting PCH ADPA register 2014-10-24 16:34:10 +02:00
intel_ddi.c drm/i915: Don't rely upon encoder->type for infoframe hw state readout 2014-11-20 22:37:04 +01:00
intel_display.c drm/i915: Ban Haswell from using RCS flips 2015-01-12 10:52:42 +02:00
intel_dp.c drm/i915/eDP: When enabling panel VDD cancel pending disable worker 2014-12-03 09:29:40 +01:00
intel_dp_mst.c drm/tile: expose the tile property to userspace (v3) 2014-12-09 09:56:48 +10:00
intel_drv.h drm/i915: fix HW lockup due to missing RPS IRQ workaround on GEN6 2015-01-12 10:52:41 +02:00
intel_dsi.c drm/i915: Bikeshed rpm functions name a bit. 2014-10-01 10:52:59 +02:00
intel_dsi.h
intel_dsi_cmd.c
intel_dsi_cmd.h
intel_dsi_panel_vbt.c
intel_dsi_pll.c
intel_dvo.c drm/i915: Don't call DVO mode_set hook on DPMS changes 2014-09-03 11:05:14 +02:00
intel_fbdev.c drm/fb: add support for tiled monitor configurations. (v2) 2014-12-09 09:56:49 +10:00
intel_fifo_underrun.c drm/i915: kerneldoc for intel_fifo_underrun.c 2014-10-24 16:33:55 +02:00
intel_frontbuffer.c drm/i915: Introduce intel_psr.c 2014-11-17 19:12:28 +01:00
intel_hdmi.c drm/i915/chv: Enable AVI, SPD and HDMI infoframes for CHV. 2014-12-03 09:29:34 +01:00
intel_i2c.c
intel_lrc.c drm/i915/bdw: Pin the ringbuffer backing object to GGTT on-demand 2014-11-19 19:56:44 +01:00
intel_lrc.h drm/i915/bdw: Pin the context backing objects to GGTT on-demand 2014-11-19 19:32:58 +01:00
intel_lvds.c Linux 3.18 2014-12-08 10:33:52 +10:00
intel_modes.c
intel_opregion.c ACPI / i915: Update the condition to ignore firmware backlight change request 2014-09-30 01:11:18 +02:00
intel_overlay.c
intel_panel.c Linux 3.18-rc7 2014-12-02 10:58:33 +10:00
intel_pm.c drm/i915: vlv: sanitize RPS interrupt mask during GPU idling 2015-01-12 10:52:41 +02:00
intel_psr.c drm/i915: Add PSR docbook 2014-11-17 19:13:24 +01:00
intel_renderstate.h drm/i915 Add golden context support for Gen9 2014-11-04 14:04:55 +01:00
intel_renderstate_gen6.c
intel_renderstate_gen7.c
intel_renderstate_gen8.c drm/i915 Update Gen8 golden context batch buffer 2014-11-04 14:04:54 +01:00
intel_renderstate_gen9.c drm/i915 Add golden context support for Gen9 2014-11-04 14:04:55 +01:00
intel_ringbuffer.c drm/i915: Force the CS stall for invalidate flushes 2014-12-16 15:06:48 +02:00
intel_ringbuffer.h drm/i915: Remove DRI1 ring accessors and API 2014-11-19 21:17:11 +01:00
intel_runtime_pm.c drm/i915: Kill check_power_well() calls 2014-12-18 12:01:41 +02:00
intel_sdvo.c drm/i915: Don't destroy DRM properties in the driver 2014-10-31 18:38:17 +01:00
intel_sdvo_regs.h
intel_sideband.c
intel_sprite.c drm/i915: use the correct obj when preparing the sprite plane 2014-11-14 10:29:13 +01:00
intel_tv.c drm/i915: Clarify irq_lock locking, intel_tv_detect 2014-09-19 14:43:19 +02:00
intel_uncore.c drm/i915/skl: Update in Gen9 multi-engine forcewake range 2014-12-03 09:29:41 +01:00
Kconfig
Makefile drm/i915: Introduce intel_psr.c 2014-11-17 19:12:28 +01:00