drm/i915: Use lockdep_pin_lock() over the construction of the request

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During request construction, we take the timeline->mutex to ensure
exclusive access to the ringbuffer (for command emission) and the
timeline itself (for command ordering). The timeline->mutex should not
be dropped by callers until we release it in i915_request_add().

lockdep provides a pin/unpin lock facility to detect accidental unlocks
inside critical sections, so put it to use for request construction.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190403082132.327-1-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2019-04-03 09:21:32 +01:00

parent c2400ec3b6

commit b66ea2c2cf

2 changed files with 15 additions and 0 deletions

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5

drivers/gpu/drm/i915/i915_request.c

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10

drivers/gpu/drm/i915/i915_request.h

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