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[media] media: i.MX27 camera: return IRQ_NONE if no IRQ status bit is set 

If active_bufs() list is empty and no IRQ status bit is set
we are probably dealing with a share IRQ. Return IRQ_NONE in
this case.

Signed-off-by: Javier Martin <javier.martin@vista-silicon.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Javier Martin 2012-02-13 10:51:53 -03:00 committed by Mauro Carvalho Chehab
parent 8636ead8b2
commit 665ad8af8f
1 changed files with 5 additions and 2 deletions
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7
drivers/media/video/mx2_camera.c
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@ -1292,7 +1292,11 @@ static irqreturn_t mx27_camera_emma_irq(int irq_emma, void *data)
if (list_empty(&pcdev->active_bufs)) {
dev_warn(pcdev->dev, "%s: called while active list is empty\n",
__func__);
goto irq_ok;
if (!status) {
spin_unlock(&pcdev->lock);
return IRQ_NONE;
}
}
if (status & (1 << 7)) { /* overflow */
@ -1323,7 +1327,6 @@ static irqreturn_t mx27_camera_emma_irq(int irq_emma, void *data)
mx27_camera_frame_done_emma(pcdev, 1, false);
}
irq_ok:
spin_unlock(&pcdev->lock);
writel(status, pcdev->base_emma + PRP_INTRSTATUS);