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[14/50] drm/i915: Warn if we receive an interrupt after freeing the buffer

Message ID 1406258918-18934-15-git-send-email-dheerajx.s.jamwal@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Dheeraj Jamwal July 25, 2014, 3:28 a.m. UTC 
From: Damien Lespiau <damien.lespiau@intel.com>

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>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
(cherry picked from commit 0c912c79eede0ba3dcc717a6e13de8766404c736)

Signed-off-by: Dheeraj Jamwal <dheerajx.s.jamwal@intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c |    5 +++++
 1 file changed, 5 insertions(+)
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Patch

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);