[PATCH 11/16] drm/i915: Warn if we receive an interrupt after freeing the buffer

Damien Lespiau
2013-10-15T17:56:02Z

This shouldn't happen as the buffer is freed after disable pipe CRCs,
but better be safe than sorry.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
---
drivers/gpu/drm/i915/i915_irq.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 0b21828..b201a21 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1197,6 +1197,11 @@ static void ivb_pipe_crc_update(struct drm_device *dev, enum pipe pipe)
struct intel_pipe_crc_entry *entry;
int head, tail;

+ if (!pipe_crc->entries) {
+ DRM_ERROR("spurious interrupt\n");
+ return;
+ }
+
head = atomic_read(&pipe_crc->head);
tail = atomic_read(&pipe_crc->tail);

--
1.8.3.1