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[media] au0828: fix disconnect sequence

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The driver crashed when the device was disconnected while an application
still had a device node open. Fixed by using the release() callback of struct
v4l2_device.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2013-03-11 10:16:45 -03:00 committed by Mauro Carvalho Chehab
parent dc6d2a2f66
commit 823beb7e22
2 changed files with 32 additions and 25 deletions
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48
drivers/media/usb/au0828/au0828-core.c
View file

@ -125,6 +125,26 @@ static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
return status;
}
static void au0828_usb_release(struct au0828_dev *dev)
{
/* I2C */
au0828_i2c_unregister(dev);
kfree(dev);
}
#ifdef CONFIG_VIDEO_AU0828_V4L2
static void au0828_usb_v4l2_release(struct v4l2_device *v4l2_dev)
{
struct au0828_dev *dev =
container_of(v4l2_dev, struct au0828_dev, v4l2_dev);
v4l2_ctrl_handler_free(&dev->v4l2_ctrl_hdl);
v4l2_device_unregister(&dev->v4l2_dev);
au0828_usb_release(dev);
}
#endif
static void au0828_usb_disconnect(struct usb_interface *interface)
{
struct au0828_dev *dev = usb_get_intfdata(interface);
@ -134,27 +154,19 @@ static void au0828_usb_disconnect(struct usb_interface *interface)
/* Digital TV */
au0828_dvb_unregister(dev);
#ifdef CONFIG_VIDEO_AU0828_V4L2
if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED)
au0828_analog_unregister(dev);
#endif
/* I2C */
au0828_i2c_unregister(dev);
#ifdef CONFIG_VIDEO_AU0828_V4L2
v4l2_ctrl_handler_free(&dev->v4l2_ctrl_hdl);
v4l2_device_unregister(&dev->v4l2_dev);
#endif
usb_set_intfdata(interface, NULL);
mutex_lock(&dev->mutex);
dev->usbdev = NULL;
mutex_unlock(&dev->mutex);
kfree(dev);
#ifdef CONFIG_VIDEO_AU0828_V4L2
if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED) {
au0828_analog_unregister(dev);
v4l2_device_disconnect(&dev->v4l2_dev);
v4l2_device_put(&dev->v4l2_dev);
return;
}
#endif
au0828_usb_release(dev);
}
static int au0828_usb_probe(struct usb_interface *interface,
@ -203,6 +215,8 @@ static int au0828_usb_probe(struct usb_interface *interface,
dev->boardnr = id->driver_info;
#ifdef CONFIG_VIDEO_AU0828_V4L2
dev->v4l2_dev.release = au0828_usb_v4l2_release;
/* Create the v4l2_device */
retval = v4l2_device_register(&interface->dev, &dev->v4l2_dev);
if (retval) {

9
drivers/media/usb/au0828/au0828-video.c
View file

@ -1063,14 +1063,7 @@ static int au0828_v4l2_close(struct file *filp)
res_free(fh, AU0828_RESOURCE_VBI);
}
if (dev->users == 1) {
if (dev->dev_state & DEV_DISCONNECTED) {
au0828_analog_unregister(dev);
kfree(fh);
kfree(dev);
return 0;
}
if (dev->users == 1 && video_is_registered(video_devdata(filp))) {
au0828_analog_stream_disable(dev);
au0828_uninit_isoc(dev);