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[media] [RFC] radio-mr800: locking fixes

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- serialize the suspend and resume functions using the global lock.
- do not call usb_autopm_put_interface after a disconnect.
- fix a race when disconnecting the device.

Reported-by: David Ellingsworth <david@identd.dyndns.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Acked-by: David Ellingsworth<david@identd.dyndns.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2010-10-17 09:26:18 -03:00 committed by Mauro Carvalho Chehab
parent e2302501c3
commit a682d4cb76
1 changed files with 14 additions and 3 deletions
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17
drivers/media/radio/radio-mr800.c
View file

@ -284,9 +284,13 @@ static void usb_amradio_disconnect(struct usb_interface *intf)
struct amradio_device *radio = to_amradio_dev(usb_get_intfdata(intf));
mutex_lock(&radio->lock);
/* increase the device node's refcount */
get_device(&radio->videodev.dev);
v4l2_device_disconnect(&radio->v4l2_dev);
mutex_unlock(&radio->lock);
video_unregister_device(&radio->videodev);
mutex_unlock(&radio->lock);
/* decrease the device node's refcount, allowing it to be released */
put_device(&radio->videodev.dev);
}
/* vidioc_querycap - query device capabilities */
@ -515,7 +519,8 @@ static int usb_amradio_close(struct file *file)
{
struct amradio_device *radio = file->private_data;
usb_autopm_put_interface(radio->intf);
if (video_is_registered(&radio->videodev))
usb_autopm_put_interface(radio->intf);
return 0;
}
@ -524,10 +529,12 @@ static int usb_amradio_suspend(struct usb_interface *intf, pm_message_t message)
{
struct amradio_device *radio = to_amradio_dev(usb_get_intfdata(intf));
mutex_lock(&radio->lock);
if (!radio->muted && radio->initialized) {
amradio_set_mute(radio, AMRADIO_STOP);
radio->muted = 0;
}
mutex_unlock(&radio->lock);
dev_info(&intf->dev, "going into suspend..\n");
return 0;
@ -538,8 +545,9 @@ static int usb_amradio_resume(struct usb_interface *intf)
{
struct amradio_device *radio = to_amradio_dev(usb_get_intfdata(intf));
mutex_lock(&radio->lock);
if (unlikely(!radio->initialized))
return 0;
goto unlock;
if (radio->stereo)
amradio_set_stereo(radio, WANT_STEREO);
@ -551,6 +559,9 @@ static int usb_amradio_resume(struct usb_interface *intf)
if (!radio->muted)
amradio_set_mute(radio, AMRADIO_START);
unlock:
mutex_unlock(&radio->lock);
dev_info(&intf->dev, "coming out of suspend..\n");
return 0;
}