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[media] em28xx: Fix em28xx deplock

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When em28xx extensions are loaded/removed, there are two locks:

a single static em28xx_devlist_mutex that registers each extension
and the struct em28xx dev->lock.

When extensions are registered, em28xx_devlist_mutex is taken first,
and then dev->lock.

Be sure that, when extensions are being removed, the same order
will be used.

Reviewed-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2013-12-27 13:01:04 -03:00
parent ce67943e2d
commit 54a2a84ea9
2 changed files with 5 additions and 2 deletions
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5
drivers/media/usb/em28xx/em28xx-cards.c
View File

@ -3485,9 +3485,7 @@ static void em28xx_usb_disconnect(struct usb_interface *interface)
dev->disconnected = 1;
if (dev->is_audio_only) {
mutex_lock(&dev->lock);
em28xx_close_extension(dev);
mutex_unlock(&dev->lock);
return;
}
@ -3506,10 +3504,13 @@ static void em28xx_usb_disconnect(struct usb_interface *interface)
em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
em28xx_uninit_usb_xfer(dev, EM28XX_DIGITAL_MODE);
}
mutex_unlock(&dev->lock);
em28xx_close_extension(dev);
/* NOTE: must be called BEFORE the resources are released */
mutex_lock(&dev->lock);
if (!dev->users)
em28xx_release_resources(dev);

2
drivers/media/usb/em28xx/em28xx-core.c
View File

@ -1094,10 +1094,12 @@ void em28xx_close_extension(struct em28xx *dev)
const struct em28xx_ops *ops = NULL;
mutex_lock(&em28xx_devlist_mutex);
mutex_lock(&dev->lock);
list_for_each_entry(ops, &em28xx_extension_devlist, next) {
if (ops->fini)
ops->fini(dev);
}
mutex_unlock(&dev->lock);
list_del(&dev->devlist);
mutex_unlock(&em28xx_devlist_mutex);
}