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Commit d35b4ce1 authored by Oliver Neukum's avatar Oliver Neukum Committed by Greg Kroah-Hartman
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USB: legousbtower: make poll notice disconnect 



poll needs to return an error if a device is disconnected
  - make poll check for device's presence
  - wake all waiters in disconnect

Signed-off-by: default avatarOliver Neukum <oliver@neukum.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent a4708103

drivers/usb/misc/legousbtower.c

+6 −0
Original line number Diff line number Diff line
@@ -552,6 +552,9 @@ static unsigned int tower_poll (struct file *file, poll_table *wait) 


	dev = file->private_data;



	if (!dev->udev)

		return POLLERR | POLLHUP;



	poll_wait(file, &dev->read_wait, wait);

	poll_wait(file, &dev->write_wait, wait);
@@ -1025,6 +1028,9 @@ static void tower_disconnect (struct usb_interface *interface) 
		tower_delete (dev);

	} else {

		dev->udev = NULL;

		/* wake up pollers */

		wake_up_interruptible_all(&dev->read_wait);

		wake_up_interruptible_all(&dev->write_wait);

		mutex_unlock(&dev->lock);

	}