drm/i915: drop the struct_mutex when wedged or trying to reset
We grab the struct_mutex in intel_crtc_page_flip, but if we are wedged
or a reset is in progress we bail early but never seem to actually
release the lock.
Fixes: 7f1847ebf4
("drm/i915: Simplify checking of GPU reset_counter in display pageflips")
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161128103648.9235-1-matthew.auld@intel.com
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: <stable@vger.kernel.org> # v4.7+
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@ -12206,7 +12206,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
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intel_crtc->reset_count = i915_reset_count(&dev_priv->gpu_error);
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if (i915_reset_in_progress_or_wedged(&dev_priv->gpu_error)) {
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ret = -EIO;
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goto cleanup;
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goto unlock;
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}
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atomic_inc(&intel_crtc->unpin_work_count);
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@ -12295,6 +12295,7 @@ cleanup_unpin:
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intel_unpin_fb_obj(fb, crtc->primary->state->rotation);
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cleanup_pending:
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atomic_dec(&intel_crtc->unpin_work_count);
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unlock:
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mutex_unlock(&dev->struct_mutex);
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cleanup:
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crtc->primary->fb = old_fb;
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