[PATCH 0/1] drm/i915: Fix a deadlock that only affects 5.4

[Sultan Alsawaf <sultan@xxxxxxxxxxxxxxx>]

From: Sultan Alsawaf <sultan@xxxxxxxxxxxxxxx>

Hi,

There's a mutex lock deadlock in i915 that only affects 5.4, but was fixed in
5.5. Normally, I would send a backport of the fix from 5.5, but the patch set
that fixes the deadlock involves massive changes that are neither feasible nor
desirable for backporting [1][2][3]. Therefore, I've made a small patch that
only addresses the deadlock specifically for 5.4.

Thanks,
Sultan

[1] 274cbf20fd10 ("drm/i915: Push the i915_active.retire into a worker")
[2] 093b92287363 ("drm/i915: Split i915_active.mutex into an irq-safe spinlock for the rbtree")
[3] 750bde2fd4ff ("drm/i915: Serialise with remote retirement")

Sultan Alsawaf (1):
  drm/i915: Fix ref->mutex deadlock in i915_active_wait()

 drivers/gpu/drm/i915/i915_active.c | 27 +++++++++++++++++++++++----
 drivers/gpu/drm/i915/i915_active.h |  4 ++--
 2 files changed, 25 insertions(+), 6 deletions(-)

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2.26.0