[media] saa7164: command dequeue fixup to clean the bus after error

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

diff --git a/drivers/media/video/saa7164/saa7164-cmd.c b/drivers/media/video/saa7164/saa7164-cmd.c
index f33c0b5338410cbd6eb79dcd1ba827f08ed98192..e4ec44f5c7cccd46d73b0023e4f4d50ff5fe36af 100644 (file)
--- a/drivers/media/video/saa7164/saa7164-cmd.c
+++ b/drivers/media/video/saa7164/saa7164-cmd.c
@@ -82,9 +82,10 @@ u32 saa7164_cmd_timeout_get(struct saa7164_dev *dev, u8 seqno)
  * -bus/c running buffer. */
 int saa7164_irq_dequeue(struct saa7164_dev *dev)
 {
-       int ret = SAA_OK;
+       int ret = SAA_OK, i = 0;
        u32 timeout;
        wait_queue_head_t *q = 0;
+       u8 tmp[512];
        dprintk(DBGLVL_CMD, "%s()\n", __func__);
 
        /* While any outstand message on the bus exists... */
@@ -109,8 +110,22 @@ int saa7164_irq_dequeue(struct saa7164_dev *dev)
                        printk(KERN_ERR
                                "%s() found timed out command on the bus\n",
                                        __func__);
+
+                       /* Clean the bus */
+                       ret = saa7164_bus_get(dev, &tRsp, &tmp, 0);
+                       printk(KERN_ERR "%s() ret = %x\n", __func__, ret);
+                       if (ret == SAA_ERR_EMPTY)
+                               /* Someone else already fetched the response */
+                               return SAA_OK;
+
+                       if (ret != SAA_OK)
+                               return ret;
                }
-       } while (0);
+
+               /* It's unlikely to have more than 4 or 5 pending messages, ensure we exit
+                * at some point regardles.
+                */
+       } while (i++ < 32);
 
        return ret;
 }