[media] au0828: fixes for timeout on no video

The first pass of fixes to cause the driver to continue streaming even when
there is no video arriving over the ITU656 bus were not adequate.  Continue
the work from the previous patch.
Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/au0828/au0828-video.c

@@ -122,6 +122,7 @@ static void au0828_irq_callback(struct urb *urb)
 {
 	struct au0828_dmaqueue  *dma_q = urb->context;
 	struct au0828_dev *dev = container_of(dma_q, struct au0828_dev, vidq);
+	unsigned long flags = 0;
 	int rc, i;
 
 	switch (urb->status) {
@@ -139,9 +140,9 @@ static void au0828_irq_callback(struct urb *urb)
 	}
 
 	/* Copy data from URB */
-	spin_lock(&dev->slock);
+	spin_lock_irqsave(&dev->slock, flags);
 	rc = dev->isoc_ctl.isoc_copy(dev, urb);
-	spin_unlock(&dev->slock);
+	spin_unlock_irqrestore(&dev->slock, flags);
 
 	/* Reset urb buffers */
 	for (i = 0; i < urb->number_of_packets; i++) {
@@ -312,9 +313,6 @@ static inline void buffer_filled(struct au0828_dev *dev,
 
 	list_del(&buf->vb.queue);
 	wake_up(&buf->vb.done);
-
-	/* Reset the timer for "no video condition" */
-	mod_timer(&dev->vid_timeout, jiffies + (HZ / 10));
 }
 
 static inline void vbi_buffer_filled(struct au0828_dev *dev,
@@ -332,9 +330,6 @@ static inline void vbi_buffer_filled(struct au0828_dev *dev,
 
 	list_del(&buf->vb.queue);
 	wake_up(&buf->vb.done);
-
-	/* Reset the timer for "no video condition" */
-	mod_timer(&dev->vbi_timeout, jiffies + (HZ / 10));
 }
 
 /*
@@ -603,6 +598,15 @@ static inline int au0828_isoc_copy(struct au0828_dev *dev, struct urb *urb)
 					outp = NULL;
 				else
 					outp = videobuf_to_vmalloc(&buf->vb);
+
+				/* As long as isoc traffic is arriving, keep
+				   resetting the timer */
+				if (dev->vid_timeout_running)
+					mod_timer(&dev->vid_timeout,
+						  jiffies + (HZ / 10));
+				if (dev->vbi_timeout_running)
+					mod_timer(&dev->vbi_timeout,
+						  jiffies + (HZ / 10));
 			}
 
 			if (buf != NULL) {
@@ -922,18 +926,22 @@ void au0828_vid_buffer_timeout(unsigned long data)
 	struct au0828_dmaqueue *dma_q = &dev->vidq;
 	struct au0828_buffer *buf;
 	unsigned char *vid_data;
+	unsigned long flags = 0;
 
-	spin_lock(&dev->slock);
+	spin_lock_irqsave(&dev->slock, flags);
 
 	buf = dev->isoc_ctl.buf;
 	if (buf != NULL) {
 		vid_data = videobuf_to_vmalloc(&buf->vb);
 		memset(vid_data, 0x00, buf->vb.size); /* Blank green frame */
 		buffer_filled(dev, dma_q, buf);
-		get_next_buf(dma_q, &buf);
 	}
+	get_next_buf(dma_q, &buf);
 
-	spin_unlock(&dev->slock);
+	if (dev->vid_timeout_running == 1)
+		mod_timer(&dev->vid_timeout, jiffies + (HZ / 10));
+
+	spin_unlock_irqrestore(&dev->slock, flags);
 }
 
 void au0828_vbi_buffer_timeout(unsigned long data)
@@ -942,18 +950,21 @@ void au0828_vbi_buffer_timeout(unsigned long data)
 	struct au0828_dmaqueue *dma_q = &dev->vbiq;
 	struct au0828_buffer *buf;
 	unsigned char *vbi_data;
+	unsigned long flags = 0;
 
-	spin_lock(&dev->slock);
+	spin_lock_irqsave(&dev->slock, flags);
 
 	buf = dev->isoc_ctl.vbi_buf;
 	if (buf != NULL) {
 		vbi_data = videobuf_to_vmalloc(&buf->vb);
 		memset(vbi_data, 0x00, buf->vb.size);
 		vbi_buffer_filled(dev, dma_q, buf);
-		vbi_get_next_buf(dma_q, &buf);
 	}
+	vbi_get_next_buf(dma_q, &buf);
 
-	spin_unlock(&dev->slock);
+	if (dev->vbi_timeout_running == 1)
+		mod_timer(&dev->vbi_timeout, jiffies + (HZ / 10));
+	spin_unlock_irqrestore(&dev->slock, flags);
 }
 
 
@@ -1026,16 +1037,6 @@ static int au0828_v4l2_open(struct file *filp)
 				    V4L2_FIELD_SEQ_TB,
 				    sizeof(struct au0828_buffer), fh, NULL);
 
-	if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
-		dev->vid_timeout.function = au0828_vid_buffer_timeout;
-		dev->vid_timeout.data = (unsigned long) dev;
-		init_timer(&dev->vid_timeout);
-	} else {
-		dev->vbi_timeout.function = au0828_vbi_buffer_timeout;
-		dev->vbi_timeout.data = (unsigned long) dev;
-		init_timer(&dev->vbi_timeout);
-	}
-
 	return ret;
 }
 
@@ -1046,13 +1047,19 @@ static int au0828_v4l2_close(struct file *filp)
 	struct au0828_dev *dev = fh->dev;
 
 	if (res_check(fh, AU0828_RESOURCE_VIDEO)) {
-		del_timer(&dev->vid_timeout);
+		/* Cancel timeout thread in case they didn't call streamoff */
+		dev->vid_timeout_running = 0;
+		del_timer_sync(&dev->vid_timeout);
+
 		videobuf_stop(&fh->vb_vidq);
 		res_free(fh, AU0828_RESOURCE_VIDEO);
 	}
 
 	if (res_check(fh, AU0828_RESOURCE_VBI)) {
-		del_timer(&dev->vbi_timeout);
+		/* Cancel timeout thread in case they didn't call streamoff */
+		dev->vbi_timeout_running = 0;
+		del_timer_sync(&dev->vbi_timeout);
+
 		videobuf_stop(&fh->vb_vbiq);
 		res_free(fh, AU0828_RESOURCE_VBI);
 	}
@@ -1638,10 +1645,15 @@ static int vidioc_streamon(struct file *file, void *priv,
 		v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1);
 	}
 
-	if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+	if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 		rc = videobuf_streamon(&fh->vb_vidq);
-	else if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE)
+		dev->vid_timeout_running = 1;
+		mod_timer(&dev->vid_timeout, jiffies + (HZ / 10));
+	} else if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 		rc = videobuf_streamon(&fh->vb_vbiq);
+		dev->vbi_timeout_running = 1;
+		mod_timer(&dev->vbi_timeout, jiffies + (HZ / 10));
+	}
 
 	return rc;
 }
@@ -1668,6 +1680,9 @@ static int vidioc_streamoff(struct file *file, void *priv,
 		fh, type, fh->resources, dev->resources);
 
 	if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+		dev->vid_timeout_running = 0;
+		del_timer_sync(&dev->vid_timeout);
+
 		v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
 		rc = au0828_stream_interrupt(dev);
 		if (rc != 0)
@@ -1682,6 +1697,9 @@ static int vidioc_streamoff(struct file *file, void *priv,
 		videobuf_streamoff(&fh->vb_vidq);
 		res_free(fh, AU0828_RESOURCE_VIDEO);
 	} else if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
+		dev->vbi_timeout_running = 0;
+		del_timer_sync(&dev->vbi_timeout);
+
 		videobuf_streamoff(&fh->vb_vbiq);
 		res_free(fh, AU0828_RESOURCE_VBI);
 	}
@@ -1901,6 +1919,14 @@ int au0828_analog_register(struct au0828_dev *dev,
 	INIT_LIST_HEAD(&dev->vbiq.active);
 	INIT_LIST_HEAD(&dev->vbiq.queued);
 
+	dev->vid_timeout.function = au0828_vid_buffer_timeout;
+	dev->vid_timeout.data = (unsigned long) dev;
+	init_timer(&dev->vid_timeout);
+
+	dev->vbi_timeout.function = au0828_vbi_buffer_timeout;
+	dev->vbi_timeout.data = (unsigned long) dev;
+	init_timer(&dev->vbi_timeout);
+
 	dev->width = NTSC_STD_W;
 	dev->height = NTSC_STD_H;
 	dev->field_size = dev->width * dev->height;

drivers/media/video/au0828/au0828.h

@@ -205,7 +205,9 @@ struct au0828_dev {
 	struct video_device *vdev;
 	struct video_device *vbi_dev;
 	struct timer_list vid_timeout;
+	int vid_timeout_running;
 	struct timer_list vbi_timeout;
+	int vbi_timeout_running;
 	int width;
 	int height;
 	int vbi_width;