From: Jason Wang <jasowang@xxxxxxxxxx>
This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.
===============
commit fbb60fe35ad579b511de8604b06a30b43846473b upstream.
Return IRQ_NONE if it was not our irq. This is necessary for the case
when qxl is sharing irq line with a device A in a crash kernel. If qxl
is initialized before A and A's irq was raised during this gap,
returning IRQ_HANDLED in this case will cause this irq to be raised
again after EOI since kernel think it was handled but in fact it was
not.
Cc: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
drivers/gpu/drm/qxl/qxl_irq.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/qxl/qxl_irq.c b/drivers/gpu/drm/qxl/qxl_irq.c
index 21393dc4700a..f4b6b89b98f3 100644
--- a/drivers/gpu/drm/qxl/qxl_irq.c
+++ b/drivers/gpu/drm/qxl/qxl_irq.c
@@ -33,6 +33,9 @@ irqreturn_t qxl_irq_handler(DRM_IRQ_ARGS)
pending = xchg(&qdev->ram_header->int_pending, 0);
+ if (!pending)
+ return IRQ_NONE;
+
atomic_inc(&qdev->irq_received);
if (pending & QXL_INTERRUPT_DISPLAY) {
--
2.0.1
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