drm/qxl: return IRQ_NONE if it was not our irq

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 <[email protected]> Cc: [email protected] Signed-off-by: Jason Wang <[email protected]> Signed-off-by: Dave Airlie <[email protected]>
neviim · Jul 16, 2014 · fbb60fe · fbb60fe
1 parent 85d9e14
commit fbb60fe
Showing 1 changed file with 3 additions and 0 deletions.
diff --git 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(int irq, void *arg)
 
 	pending = xchg(&qdev->ram_header->int_pending, 0);
 
+	if (!pending)
+		return IRQ_NONE;
+
 	atomic_inc(&qdev->irq_received);
 
 	if (pending & QXL_INTERRUPT_DISPLAY) {