drm/i915: Drop rq->ring->vma peeking from error capture

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We only hold the active spinlock while dumping the error state, and this
does not prevent another thread from retiring the request -- as it is
quite possible that despite us capturing the current state, the GPU has
completed the request. As such, it is dangerous to dereference state
below the request as it may already be freed, and the simplest way to
avoid the danger is not include it in the error state.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1788
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Andi Shyti <andi.shyti@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200424191410.27570-1-chris@chris-wilson.co.uk

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Chris Wilson 2020-04-24 20:14:10 +01:00

parent 9c878557b1

commit 9669a50799

2 changed files with 2 additions and 4 deletions

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5

drivers/gpu/drm/i915/i915_gpu_error.c

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1

drivers/gpu/drm/i915/i915_gpu_error.h

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