[media] saa7164: generate a fixed kernel warning if the irq is 'late'

Now we start to see a number of patches applied that are related
to debugging the driver. This patch is removed in the coming patches
as you start to see the irq handler evolve as I worked through the
DMA data corruption issues.

Signed-off-by: Steven Toth <stoth@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/media/video/saa7164/saa7164-core.c b/drivers/media/video/saa7164/saa7164-core.c
index 591a3c101c0f..20257664b40b 100644
--- a/drivers/media/video/saa7164/saa7164-core.c
+++ b/drivers/media/video/saa7164/saa7164-core.c
@@ -267,7 +267,12 @@ static irqreturn_t saa7164_irq_encoder(struct saa7164_port *port)
                 return 0;
         }
 
-        /* Sore old time */
+        if (rp != ((port->last_irq_rp + 1) % 8)) {
+                printk(KERN_ERR "%s() Multiple bufs on interrupt, port %p\n",
+                        __func__, port);
+        }
+
+        /* Store old time */
         port->last_irq_msecs_diff = port->last_irq_msecs;
 
         /* Collect new stats */