drm/i915: Propagate errors from writing to ringbuffer
Preparing the ringbuffer for adding new commands can fail (a timeout
whilst waiting for the GPU to catch up and free some space). So check
for any potential error before overwriting HEAD with new commands, and
propagate that error back to the user where possible.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index ba4a393..35ece2b 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -100,8 +100,8 @@
}
void intel_cleanup_ring_buffer(struct intel_ring_buffer *ring);
-int intel_wait_ring_buffer(struct intel_ring_buffer *ring, int n);
-void intel_ring_begin(struct intel_ring_buffer *ring, int n);
+int __must_check intel_wait_ring_buffer(struct intel_ring_buffer *ring, int n);
+int __must_check intel_ring_begin(struct intel_ring_buffer *ring, int n);
static inline void intel_ring_emit(struct intel_ring_buffer *ring,
u32 data)