drm/i915: Lock the engine while dumping the active request

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We cannot let the request be retired and freed while we are trying to
dump it during error capture. It is not sufficient just to grab a
reference to the request, as during retirement we may free the ring
which we are also dumping. So take the engine lock to prevent retiring
and freeing of the request.

Reported-by: Alex Shumsky <alexthreed@gmail.com>
Fixes: 83c317832e ("drm/i915: Dump the ringbuffer of the active request for debugging")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Alex Shumsky <alexthreed@gmail.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190715080946.15593-6-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2019-07-15 09:09:28 +01:00

parent bb80c92557

commit cfe7288c27

2 changed files with 8 additions and 9 deletions

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11

drivers/gpu/drm/i915/gt/intel_engine_cs.c

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6

drivers/gpu/drm/i915/i915_gpu_error.c

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