Messages in this thread Patch in this message | | | From | Jason Wang <> | Subject | [PATCH] drm/qxl: return IRQ_NONE if it was not our irq | Date | Mon, 12 May 2014 16:35:39 +0800 |
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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@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Jason Wang <jasowang@redhat.com> --- 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 28f84b4..3485bdc 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(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) { -- 1.9.1
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