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drm/i915: Detect potential i915_reset_trylock() lockups

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Use lockdep to warn before we wait indefinitely in case we may be
waiting indefinitely.

Suggested-by: Mika Kuoppala <mika.kuoppala@intel.com>
References: 2caffbf117 ("drm/i915: Revoke mmaps and prevent access to fence registers across reset")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190212130831.14425-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-02-12 13:08:31 +00:00
parent aeaaa55c73
commit b3b0391af2
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/i915_reset.c
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@ -1305,6 +1305,9 @@ int i915_reset_trylock(struct drm_i915_private *i915)
struct i915_gpu_error *error = &i915->gpu_error;
int srcu;
might_lock(&error->reset_backoff_srcu);
might_sleep();
rcu_read_lock();
while (test_bit(I915_RESET_BACKOFF, &error->flags)) {
rcu_read_unlock();