This is a note to let you know that I've just added the patch titled
drm/qxl: return IRQ_NONE if it was not our irq
to the 3.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-qxl-return-irq_none-if-it-was-not-our-irq.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From fbb60fe35ad579b511de8604b06a30b43846473b Mon Sep 17 00:00:00 2001
From: Jason Wang <jasowang@xxxxxxxxxx>
Date: Mon, 12 May 2014 16:35:39 +0800
Subject: drm/qxl: return IRQ_NONE if it was not our irq
From: Jason Wang <jasowang@xxxxxxxxxx>
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: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/qxl/qxl_irq.c | 3 +++
1 file changed, 3 insertions(+)
--- 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, voi
pending = xchg(&qdev->ram_header->int_pending, 0);
+ if (!pending)
+ return IRQ_NONE;
+
atomic_inc(&qdev->irq_received);
if (pending & QXL_INTERRUPT_DISPLAY) {
Patches currently in stable-queue which might be from jasowang@xxxxxxxxxx are
queue-3.15/drm-qxl-return-irq_none-if-it-was-not-our-irq.patch
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