V4L/DVB (10219): saa7134: Prevent Oops due to stale IRQ status when enabling interrupts

When enabling a shared IRQ line, then saa7134_irq handler could be invoked
before the driver had completely set up internal structures, due to a shared
interrupt line firing.  Clear the saa7134 interrupt status reg, before
requesting the irq line, so that stale IRQ status isn't processed before the
internal structures are set up.

Marcin Slusarz recently brought this Oops to the attention of the v4l-dvb
lists and provided an initial analysis by investigating reports found here:

http://kerneloops.org/guilty.php?guilty=mute_input_7133&version=2.6.27-release&start=1802240&end=1835007&class=oops

Reported-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/saa7134/saa7134-core.c b/drivers/media/video/saa7134/saa7134-core.c
index dfbe08a9ad9b8517f4a234ecc86d8c1af52ef98f..99221d726edb373603c6d75789459b3209b03b9b 100644 (file)
--- a/drivers/media/video/saa7134/saa7134-core.c
+++ b/drivers/media/video/saa7134/saa7134-core.c
@@ -660,6 +660,10 @@ static int saa7134_hwinit1(struct saa7134_dev *dev)
 
        saa_writel(SAA7134_IRQ1, 0);
        saa_writel(SAA7134_IRQ2, 0);
+
+       /* Clear any stale IRQ reports */
+       saa_writel(SAA7134_IRQ_REPORT, saa_readl(SAA7134_IRQ_REPORT));
+
        mutex_init(&dev->lock);
        spin_lock_init(&dev->slock);