V4L/DVB (7121): Renames videobuf lock to vb_lock

This helps to identify where vb_lock is being used, and find missusages of the
locks.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/bt8xx/bttv-driver.c

@@ -2354,8 +2354,8 @@ static int setup_window(struct bttv_fh *fh, struct bttv *btv,
 		BUG();
 	}
 
-	mutex_lock(&fh->cap.lock);
-		kfree(fh->ov.clips);
+	mutex_lock(&fh->cap.vb_lock);
+	kfree(fh->ov.clips);
 	fh->ov.clips    = clips;
 	fh->ov.nclips   = n;
 
@@ -2376,7 +2376,7 @@ static int setup_window(struct bttv_fh *fh, struct bttv *btv,
 		bttv_overlay_risc(btv, &fh->ov, fh->ovfmt, new);
 		retval = bttv_switch_overlay(btv,fh,new);
 	}
-	mutex_unlock(&fh->cap.lock);
+	mutex_unlock(&fh->cap.vb_lock);
 	return retval;
 }
 
@@ -2576,7 +2576,7 @@ static int bttv_s_fmt_cap(struct file *file, void *priv,
 	fmt = format_by_fourcc(f->fmt.pix.pixelformat);
 
 	/* update our state informations */
-	mutex_lock(&fh->cap.lock);
+	mutex_lock(&fh->cap.vb_lock);
 	fh->fmt              = fmt;
 	fh->cap.field        = f->fmt.pix.field;
 	fh->cap.last         = V4L2_FIELD_NONE;
@@ -2585,7 +2585,7 @@ static int bttv_s_fmt_cap(struct file *file, void *priv,
 	btv->init.fmt        = fmt;
 	btv->init.width      = f->fmt.pix.width;
 	btv->init.height     = f->fmt.pix.height;
-	mutex_unlock(&fh->cap.lock);
+	mutex_unlock(&fh->cap.vb_lock);
 
 	return 0;
 }
@@ -2611,11 +2611,11 @@ static int vidiocgmbuf(struct file *file, void *priv, struct video_mbuf *mbuf)
 	unsigned int i;
 	struct bttv_fh *fh = priv;
 
-	mutex_lock(&fh->cap.lock);
+	mutex_lock(&fh->cap.vb_lock);
 	retval = videobuf_mmap_setup(&fh->cap, gbuffers, gbufsize,
 				     V4L2_MEMORY_MMAP);
 	if (retval < 0) {
-		mutex_unlock(&fh->cap.lock);
+		mutex_unlock(&fh->cap.vb_lock);
 		return retval;
 	}
 
@@ -2627,7 +2627,7 @@ static int vidiocgmbuf(struct file *file, void *priv, struct video_mbuf *mbuf)
 	for (i = 0; i < gbuffers; i++)
 		mbuf->offsets[i] = i * gbufsize;
 
-	mutex_unlock(&fh->cap.lock);
+	mutex_unlock(&fh->cap.vb_lock);
 	return 0;
 }
 #endif
@@ -2756,7 +2756,7 @@ static int bttv_overlay(struct file *file, void *f, unsigned int on)
 	if (!check_alloc_btres(btv, fh, RESOURCE_OVERLAY))
 		return -EBUSY;
 
-	mutex_lock(&fh->cap.lock);
+	mutex_lock(&fh->cap.vb_lock);
 	if (on) {
 		fh->ov.tvnorm = btv->tvnorm;
 		new = videobuf_pci_alloc(sizeof(*new));
@@ -2767,7 +2767,7 @@ static int bttv_overlay(struct file *file, void *f, unsigned int on)
 
 	/* switch over */
 	retval = bttv_switch_overlay(btv, fh, new);
-	mutex_unlock(&fh->cap.lock);
+	mutex_unlock(&fh->cap.vb_lock);
 	return retval;
 }
 
@@ -2806,7 +2806,7 @@ static int bttv_s_fbuf(struct file *file, void *f,
 	}
 
 	/* ok, accept it */
-	mutex_lock(&fh->cap.lock);
+	mutex_lock(&fh->cap.vb_lock);
 	btv->fbuf.base       = fb->base;
 	btv->fbuf.fmt.width  = fb->fmt.width;
 	btv->fbuf.fmt.height = fb->fmt.height;
@@ -2838,7 +2838,7 @@ static int bttv_s_fbuf(struct file *file, void *f,
 			retval = bttv_switch_overlay(btv, fh, new);
 		}
 	}
-	mutex_unlock(&fh->cap.lock);
+	mutex_unlock(&fh->cap.vb_lock);
 	return retval;
 }
 
@@ -3090,7 +3090,7 @@ static int bttv_s_crop(struct file *file, void *f, struct v4l2_crop *crop)
 
 	fh->do_crop = 1;
 
-	mutex_lock(&fh->cap.lock);
+	mutex_lock(&fh->cap.vb_lock);
 
 	if (fh->width < c.min_scaled_width) {
 		fh->width = c.min_scaled_width;
@@ -3108,7 +3108,7 @@ static int bttv_s_crop(struct file *file, void *f, struct v4l2_crop *crop)
 		btv->init.height = c.max_scaled_height;
 	}
 
-	mutex_unlock(&fh->cap.lock);
+	mutex_unlock(&fh->cap.vb_lock);
 
 	return 0;
 }
@@ -3177,30 +3177,25 @@ static unsigned int bttv_poll(struct file *file, poll_table *wait)
 		buf = list_entry(fh->cap.stream.next,struct bttv_buffer,vb.stream);
 	} else {
 		/* read() capture */
-		mutex_lock(&fh->cap.lock);
+		mutex_lock(&fh->cap.vb_lock);
 		if (NULL == fh->cap.read_buf) {
 			/* need to capture a new frame */
-			if (locked_btres(fh->btv,RESOURCE_VIDEO_STREAM)) {
-				mutex_unlock(&fh->cap.lock);
-				return POLLERR;
-			}
+			if (locked_btres(fh->btv,RESOURCE_VIDEO_STREAM))
+				goto err;
 			fh->cap.read_buf = videobuf_pci_alloc(fh->cap.msize);
-			if (NULL == fh->cap.read_buf) {
-				mutex_unlock(&fh->cap.lock);
-				return POLLERR;
-			}
+			if (NULL == fh->cap.read_buf)
+				goto err;
 			fh->cap.read_buf->memory = V4L2_MEMORY_USERPTR;
 			field = videobuf_next_field(&fh->cap);
 			if (0 != fh->cap.ops->buf_prepare(&fh->cap,fh->cap.read_buf,field)) {
 				kfree (fh->cap.read_buf);
 				fh->cap.read_buf = NULL;
-				mutex_unlock(&fh->cap.lock);
-				return POLLERR;
+				goto err;
 			}
 			fh->cap.ops->buf_queue(&fh->cap,fh->cap.read_buf);
 			fh->cap.read_off = 0;
 		}
-		mutex_unlock(&fh->cap.lock);
+		mutex_unlock(&fh->cap.vb_lock);
 		buf = (struct bttv_buffer*)fh->cap.read_buf;
 	}
 
@@ -3209,6 +3204,9 @@ static unsigned int bttv_poll(struct file *file, poll_table *wait)
 	    buf->vb.state == VIDEOBUF_ERROR)
 		return POLLIN|POLLRDNORM;
 	return 0;
+err:
+	mutex_unlock(&fh->cap.vb_lock);
+	return POLLERR;
 }
 
 static int bttv_open(struct inode *inode, struct file *file)

drivers/media/video/bt8xx/bttv-vbi.c

@@ -352,13 +352,13 @@ int bttv_s_fmt_vbi(struct file *file, void *f, struct v4l2_format *frt)
 	   because vbi_fmt.end counts field lines times two. */
 	end = max(frt->fmt.vbi.start[0], start1) * 2 + 2;
 
-	mutex_lock(&fh->vbi.lock);
+	mutex_lock(&fh->vbi.vb_lock);
 
 	fh->vbi_fmt.fmt    = frt->fmt.vbi;
 	fh->vbi_fmt.tvnorm = tvnorm;
 	fh->vbi_fmt.end    = end;
 
-	mutex_unlock(&fh->vbi.lock);
+	mutex_unlock(&fh->vbi.vb_lock);
 
 	rc = 0;
 

drivers/media/video/saa7134/saa7134-empress.c

@@ -87,7 +87,7 @@ static int ts_open(struct inode *inode, struct file *file)
 
 	dprintk("open minor=%d\n",minor);
 	err = -EBUSY;
-	if (!mutex_trylock(&dev->empress_tsq.lock))
+	if (!mutex_trylock(&dev->empress_tsq.vb_lock))
 		goto done;
 	if (dev->empress_users)
 		goto done_up;
@@ -101,7 +101,7 @@ static int ts_open(struct inode *inode, struct file *file)
 	err = 0;
 
 done_up:
-	mutex_unlock(&dev->empress_tsq.lock);
+	mutex_unlock(&dev->empress_tsq.vb_lock);
 done:
 	return err;
 }
@@ -110,7 +110,7 @@ static int ts_release(struct inode *inode, struct file *file)
 {
 	struct saa7134_dev *dev = file->private_data;
 
-	mutex_lock(&dev->empress_tsq.lock);
+	mutex_lock(&dev->empress_tsq.vb_lock);
 	videobuf_stop(&dev->empress_tsq);
 	videobuf_mmap_free(&dev->empress_tsq);
 	dev->empress_users--;
@@ -122,7 +122,7 @@ static int ts_release(struct inode *inode, struct file *file)
 	saa_writeb(SAA7134_AUDIO_MUTE_CTRL,
 		saa_readb(SAA7134_AUDIO_MUTE_CTRL) | (1 << 6));
 
-	mutex_unlock(&dev->empress_tsq.lock);
+	mutex_unlock(&dev->empress_tsq.vb_lock);
 	return 0;
 }
 

drivers/media/video/saa7134/saa7134-video.c

@@ -1414,21 +1414,17 @@ video_poll(struct file *file, struct poll_table_struct *wait)
 		if (!list_empty(&fh->cap.stream))
 			buf = list_entry(fh->cap.stream.next, struct videobuf_buffer, stream);
 	} else {
-		mutex_lock(&fh->cap.lock);
+		mutex_lock(&fh->cap.vb_lock);
 		if (UNSET == fh->cap.read_off) {
 			/* need to capture a new frame */
-			if (res_locked(fh->dev,RESOURCE_VIDEO)) {
-				mutex_unlock(&fh->cap.lock);
-				return POLLERR;
-			}
-			if (0 != fh->cap.ops->buf_prepare(&fh->cap,fh->cap.read_buf,fh->cap.field)) {
-				mutex_unlock(&fh->cap.lock);
-				return POLLERR;
-			}
+			if (res_locked(fh->dev,RESOURCE_VIDEO))
+				goto err;
+			if (0 != fh->cap.ops->buf_prepare(&fh->cap,fh->cap.read_buf,fh->cap.field))
+				goto err;
 			fh->cap.ops->buf_queue(&fh->cap,fh->cap.read_buf);
 			fh->cap.read_off = 0;
 		}
-		mutex_unlock(&fh->cap.lock);
+		mutex_unlock(&fh->cap.vb_lock);
 		buf = fh->cap.read_buf;
 	}
 
@@ -1440,6 +1436,10 @@ video_poll(struct file *file, struct poll_table_struct *wait)
 	    buf->state == VIDEOBUF_ERROR)
 		return POLLIN|POLLRDNORM;
 	return 0;
+
+err:
+	mutex_unlock(&fh->cap.vb_lock);
+	return POLLERR;
 }
 
 static int video_release(struct inode *inode, struct file *file)

drivers/media/video/videobuf-core.c

@@ -147,7 +147,7 @@ void videobuf_queue_core_init(struct videobuf_queue *q,
 	/* Having implementations for abstract methods are mandatory */
 	BUG_ON(!q->int_ops);
 
-	mutex_init(&q->lock);
+	mutex_init(&q->vb_lock);
 	INIT_LIST_HEAD(&q->stream);
 }
 
@@ -189,7 +189,7 @@ int videobuf_queue_is_busy(struct videobuf_queue *q)
 	return 0;
 }
 
-/* Locking: Caller holds q->lock */
+/* Locking: Caller holds q->vb_lock */
 void videobuf_queue_cancel(struct videobuf_queue *q)
 {
 	unsigned long flags = 0;
@@ -220,7 +220,7 @@ void videobuf_queue_cancel(struct videobuf_queue *q)
 
 /* --------------------------------------------------------------------- */
 
-/* Locking: Caller holds q->lock */
+/* Locking: Caller holds q->vb_lock */
 enum v4l2_field videobuf_next_field(struct videobuf_queue *q)
 {
 	enum v4l2_field field = q->field;
@@ -239,7 +239,7 @@ enum v4l2_field videobuf_next_field(struct videobuf_queue *q)
 	return field;
 }
 
-/* Locking: Caller holds q->lock */
+/* Locking: Caller holds q->vb_lock */
 static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b,
 			    struct videobuf_buffer *vb, enum v4l2_buf_type type)
 {
@@ -295,7 +295,7 @@ static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b,
 	b->sequence  = vb->field_count >> 1;
 }
 
-/* Locking: Caller holds q->lock */
+/* Locking: Caller holds q->vb_lock */
 static int __videobuf_mmap_free(struct videobuf_queue *q)
 {
 	int i;
@@ -328,13 +328,13 @@ static int __videobuf_mmap_free(struct videobuf_queue *q)
 int videobuf_mmap_free(struct videobuf_queue *q)
 {
 	int ret;
-	mutex_lock(&q->lock);
+	mutex_lock(&q->vb_lock);
 	ret = __videobuf_mmap_free(q);
-	mutex_unlock(&q->lock);
+	mutex_unlock(&q->vb_lock);
 	return ret;
 }
 
-/* Locking: Caller holds q->lock */
+/* Locking: Caller holds q->vb_lock */
 static int __videobuf_mmap_setup(struct videobuf_queue *q,
 			unsigned int bcount, unsigned int bsize,
 			enum v4l2_memory memory)
@@ -384,9 +384,9 @@ int videobuf_mmap_setup(struct videobuf_queue *q,
 			enum v4l2_memory memory)
 {
 	int ret;
-	mutex_lock(&q->lock);
+	mutex_lock(&q->vb_lock);
 	ret = __videobuf_mmap_setup(q, bcount, bsize, memory);
-	mutex_unlock(&q->lock);
+	mutex_unlock(&q->vb_lock);
 	return ret;
 }
 
@@ -408,7 +408,7 @@ int videobuf_reqbufs(struct videobuf_queue *q,
 		return -EINVAL;
 	}
 
-	mutex_lock(&q->lock);
+	mutex_lock(&q->vb_lock);
 	if (req->type != q->type) {
 		dprintk(1, "reqbufs: queue type invalid\n");
 		retval = -EINVAL;
@@ -444,7 +444,7 @@ int videobuf_reqbufs(struct videobuf_queue *q,
 	req->count = retval;
 
  done:
-	mutex_unlock(&q->lock);
+	mutex_unlock(&q->vb_lock);
 	return retval;
 }
 
@@ -452,7 +452,7 @@ int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
 {
 	int ret = -EINVAL;
 
-	mutex_lock(&q->lock);
+	mutex_lock(&q->vb_lock);
 	if (unlikely(b->type != q->type)) {
 		dprintk(1, "querybuf: Wrong type.\n");
 		goto done;
@@ -470,7 +470,7 @@ int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
 
 	ret = 0;
 done:
-	mutex_unlock(&q->lock);
+	mutex_unlock(&q->vb_lock);
 	return ret;
 }
 
@@ -487,7 +487,7 @@ int videobuf_qbuf(struct videobuf_queue *q,
 	if (b->memory == V4L2_MEMORY_MMAP)
 		down_read(&current->mm->mmap_sem);
 
-	mutex_lock(&q->lock);
+	mutex_lock(&q->vb_lock);
 	retval = -EBUSY;
 	if (q->reading) {
 		dprintk(1, "qbuf: Reading running...\n");
@@ -573,7 +573,7 @@ int videobuf_qbuf(struct videobuf_queue *q,
 	retval = 0;
 
  done:
-	mutex_unlock(&q->lock);
+	mutex_unlock(&q->vb_lock);
 
 	if (b->memory == V4L2_MEMORY_MMAP)
 		up_read(&current->mm->mmap_sem);
@@ -589,7 +589,7 @@ int videobuf_dqbuf(struct videobuf_queue *q,
 
 	MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
 
-	mutex_lock(&q->lock);
+	mutex_lock(&q->vb_lock);
 	retval = -EBUSY;
 	if (q->reading) {
 		dprintk(1, "dqbuf: Reading running...\n");
@@ -632,7 +632,7 @@ int videobuf_dqbuf(struct videobuf_queue *q,
 	videobuf_status(q, b, buf, q->type);
 
  done:
-	mutex_unlock(&q->lock);
+	mutex_unlock(&q->vb_lock);
 	return retval;
 }
 
@@ -642,7 +642,7 @@ int videobuf_streamon(struct videobuf_queue *q)
 	unsigned long flags = 0;
 	int retval;
 
-	mutex_lock(&q->lock);
+	mutex_lock(&q->vb_lock);
 	retval = -EBUSY;
 	if (q->reading)
 		goto done;
@@ -659,11 +659,11 @@ int videobuf_streamon(struct videobuf_queue *q)
 		spin_unlock_irqrestore(q->irqlock, flags);
 
  done:
-	mutex_unlock(&q->lock);
+	mutex_unlock(&q->vb_lock);
 	return retval;
 }
 
-/* Locking: Caller holds q->lock */
+/* Locking: Caller holds q->vb_lock */
 static int __videobuf_streamoff(struct videobuf_queue *q)
 {
 	if (!q->streaming)
@@ -679,14 +679,14 @@ int videobuf_streamoff(struct videobuf_queue *q)
 {
 	int retval;
 
-	mutex_lock(&q->lock);
+	mutex_lock(&q->vb_lock);
 	retval = __videobuf_streamoff(q);
-	mutex_unlock(&q->lock);
+	mutex_unlock(&q->vb_lock);
 
 	return retval;
 }
 
-/* Locking: Caller holds q->lock */
+/* Locking: Caller holds q->vb_lock */
 static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q,
 				      char __user *data,
 				      size_t count, loff_t *ppos)
@@ -745,7 +745,7 @@ ssize_t videobuf_read_one(struct videobuf_queue *q,
 
 	MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
 
-	mutex_lock(&q->lock);
+	mutex_lock(&q->vb_lock);
 
 	nbufs = 1; size = 0;
 	q->ops->buf_setup(q, &nbufs, &size);
@@ -817,11 +817,11 @@ ssize_t videobuf_read_one(struct videobuf_queue *q,
 	}
 
  done:
-	mutex_unlock(&q->lock);
+	mutex_unlock(&q->vb_lock);
 	return retval;
 }
 
-/* Locking: Caller holds q->lock */
+/* Locking: Caller holds q->vb_lock */
 static int __videobuf_read_start(struct videobuf_queue *q)
 {
 	enum v4l2_field field;
@@ -882,23 +882,23 @@ int videobuf_read_start(struct videobuf_queue *q)
 {
 	int rc;
 
-	mutex_lock(&q->lock);
+	mutex_lock(&q->vb_lock);
 	rc = __videobuf_read_start(q);
-	mutex_unlock(&q->lock);
+	mutex_unlock(&q->vb_lock);
 
 	return rc;
 }
 
 void videobuf_read_stop(struct videobuf_queue *q)
 {
-	mutex_lock(&q->lock);
+	mutex_lock(&q->vb_lock);
 	__videobuf_read_stop(q);
-	mutex_unlock(&q->lock);
+	mutex_unlock(&q->vb_lock);
 }
 
 void videobuf_stop(struct videobuf_queue *q)
 {
-	mutex_lock(&q->lock);
+	mutex_lock(&q->vb_lock);
 
 	if (q->streaming)
 		__videobuf_streamoff(q);
@@ -906,7 +906,7 @@ void videobuf_stop(struct videobuf_queue *q)
 	if (q->reading)
 		__videobuf_read_stop(q);
 
-	mutex_unlock(&q->lock);
+	mutex_unlock(&q->vb_lock);
 }
 
 
@@ -920,7 +920,7 @@ ssize_t videobuf_read_stream(struct videobuf_queue *q,
 	MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
 
 	dprintk(2, "%s\n", __FUNCTION__);
-	mutex_lock(&q->lock);
+	mutex_lock(&q->vb_lock);
 	retval = -EBUSY;
 	if (q->streaming)
 		goto done;
@@ -980,7 +980,7 @@ ssize_t videobuf_read_stream(struct videobuf_queue *q,
 	}
 
  done:
-	mutex_unlock(&q->lock);
+	mutex_unlock(&q->vb_lock);
 	return retval;
 }
 
@@ -991,7 +991,7 @@ unsigned int videobuf_poll_stream(struct file *file,
 	struct videobuf_buffer *buf = NULL;
 	unsigned int rc = 0;
 
-	mutex_lock(&q->lock);
+	mutex_lock(&q->vb_lock);
 	if (q->streaming) {
 		if (!list_empty(&q->stream))
 			buf = list_entry(q->stream.next,
@@ -1019,7 +1019,7 @@ unsigned int videobuf_poll_stream(struct file *file,
 		    buf->state == VIDEOBUF_ERROR)
 			rc = POLLIN|POLLRDNORM;
 	}
-	mutex_unlock(&q->lock);
+	mutex_unlock(&q->vb_lock);
 	return rc;
 }
 
@@ -1030,10 +1030,10 @@ int videobuf_mmap_mapper(struct videobuf_queue *q,
 
 	MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
 
-	mutex_lock(&q->lock);
+	mutex_lock(&q->vb_lock);
 	retval = CALL(q, mmap_mapper, q, vma);
 	q->is_mmapped = 1;
-	mutex_unlock(&q->lock);
+	mutex_unlock(&q->vb_lock);
 
 	return retval;
 }

drivers/media/video/videobuf-dma-sg.c

@@ -356,7 +356,7 @@ videobuf_vm_close(struct vm_area_struct *vma)
 	map->count--;
 	if (0 == map->count) {
 		dprintk(1,"munmap %p q=%p\n",map,q);
-		mutex_lock(&q->lock);
+		mutex_lock(&q->vb_lock);
 		for (i = 0; i < VIDEO_MAX_FRAME; i++) {
 			if (NULL == q->bufs[i])
 				continue;
@@ -373,7 +373,7 @@ videobuf_vm_close(struct vm_area_struct *vma)
 			q->bufs[i]->baddr = 0;
 			q->ops->buf_release(q,q->bufs[i]);
 		}
-		mutex_unlock(&q->lock);
+		mutex_unlock(&q->vb_lock);
 		kfree(map);
 	}
 	return;

drivers/media/video/videobuf-vmalloc.c

@@ -70,7 +70,7 @@ videobuf_vm_close(struct vm_area_struct *vma)
 	map->count--;
 	if (0 == map->count) {
 		dprintk(1,"munmap %p q=%p\n",map,q);
-		mutex_lock(&q->lock);
+		mutex_lock(&q->vb_lock);
 		for (i = 0; i < VIDEO_MAX_FRAME; i++) {
 			if (NULL == q->bufs[i])
 				continue;
@@ -83,7 +83,7 @@ videobuf_vm_close(struct vm_area_struct *vma)
 			q->bufs[i]->map   = NULL;
 			q->bufs[i]->baddr = 0;
 		}
-		mutex_unlock(&q->lock);
+		mutex_unlock(&q->vb_lock);
 		kfree(map);
 	}
 	return;

include/media/videobuf-core.h

@@ -149,7 +149,7 @@ struct videobuf_qtype_ops {
 };
 
 struct videobuf_queue {
-	struct mutex               lock;
+	struct mutex               vb_lock;
 	spinlock_t                 *irqlock;
 	void			   *dev; /* on pci, points to struct pci_dev */