gspca: Move the video device to a separate area.

From: Jean-Francois Moine <moinejf@free.fr>

The video device was part of the gspca device. On device disconnection
while streaming, the device structure is freed at close time.
In this case, the remaining close job on the video device run out of
allocated memory.

Priority: high

Signed-off-by: Jean-Francois Moine <moinejf@free.fr>

2 files changed, 14 insertions, 16 deletions

diff --git a/linux/drivers/media/video/gspca/gspca.c b/linux/drivers/media/video/gspca/gspca.c
index 4e3833a00..35f504440 100644
--- a/linux/drivers/media/video/gspca/gspca.c
+++ b/linux/drivers/media/video/gspca/gspca.c
@@ -897,7 +897,7 @@ static int dev_open(struct inode *inode, struct file *file)
 	int ret;
 
 	PDEBUG(D_STREAM, "%s open", current->comm);
-	gspca_dev = (struct gspca_dev *) video_devdata(file);
+	gspca_dev = video_drvdata(file);
 	if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 		return -ERESTARTSYS;
 	if (!gspca_dev->present) {
@@ -925,10 +925,10 @@ static int dev_open(struct inode *inode, struct file *file)
 #ifdef GSPCA_DEBUG
 	/* activate the v4l2 debug */
 	if (gspca_debug & D_V4L2)
-		gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
+		gspca_dev->vdev->debug |= V4L2_DEBUG_IOCTL
 					| V4L2_DEBUG_IOCTL_ARG;
 	else
-		gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
+		gspca_dev->vdev->debug &= ~(V4L2_DEBUG_IOCTL
 					| V4L2_DEBUG_IOCTL_ARG);
 #endif
 	ret = 0;
@@ -1790,11 +1790,6 @@ out:
 	return ret;
 }
 
-static void dev_release(struct video_device *vfd)
-{
-	/* nothing */
-}
-
 static struct file_operations dev_fops = {
 	.owner = THIS_MODULE,
 	.open = dev_open,
@@ -1842,7 +1837,7 @@ static struct video_device gspca_template = {
 	.name = "gspca main driver",
 	.fops = &dev_fops,
 	.ioctl_ops = &dev_ioctl_ops,
-	.release = dev_release,		/* mandatory */
+	.release = video_device_release,
 	.minor = -1,
 };
 
@@ -1912,16 +1907,18 @@ int gspca_dev_probe(struct usb_interface *intf,
 	init_waitqueue_head(&gspca_dev->wq);
 
 	/* init video stuff */
-	memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
-	gspca_dev->vdev.parent = &dev->dev;
-	gspca_dev->vdev.fops = &dev_fops;
+	gspca_dev->vdev = video_device_alloc();
+	memcpy(gspca_dev->vdev, &gspca_template, sizeof gspca_template);
+	gspca_dev->vdev->parent = &dev->dev;
 	gspca_dev->module = module;
 	gspca_dev->present = 1;
-	ret = video_register_device(&gspca_dev->vdev,
+	video_set_drvdata(gspca_dev->vdev, gspca_dev);
+	ret = video_register_device(gspca_dev->vdev,
 				  VFL_TYPE_GRABBER,
 				  video_nr);
 	if (ret < 0) {
 		err("video_register_device err %d", ret);
+		video_device_release(gspca_dev->vdev);
 		goto out;
 	}
 
@@ -1929,7 +1926,8 @@ int gspca_dev_probe(struct usb_interface *intf,
 	PDEBUG(D_PROBE, "probe ok");
 	return 0;
 out:
-	kref_put(&gspca_dev->kref, gspca_delete);
+	kfree(gspca_dev->usb_buf);
+	kfree(gspca_dev);
 	return ret;
 }
 EXPORT_SYMBOL(gspca_dev_probe);
@@ -1947,7 +1945,7 @@ void gspca_disconnect(struct usb_interface *intf)
 	usb_set_intfdata(intf, NULL);
 
 /* We don't want people trying to open up the device */
-	video_unregister_device(&gspca_dev->vdev);
+	video_unregister_device(gspca_dev->vdev);
 
 	gspca_dev->present = 0;
 	gspca_dev->streaming = 0;
diff --git a/linux/drivers/media/video/gspca/gspca.h b/linux/drivers/media/video/gspca/gspca.h
index 4ff9b8105..a557738e8 100644
--- a/linux/drivers/media/video/gspca/gspca.h
+++ b/linux/drivers/media/video/gspca/gspca.h
@@ -124,7 +124,7 @@ struct gspca_frame {
 };
 
 struct gspca_dev {
-	struct video_device vdev;	/* !! must be the first item */
+	struct video_device *vdev;
 	struct module *module;		/* subdriver handling the device */
 	struct usb_device *dev;
 	struct kref kref;