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USB: legousbtower: make poll notice disconnect

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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: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum 2009-07-02 12:07:07 +02:00 committed by Greg Kroah-Hartman
parent a4708103ad
commit d35b4ce164
1 changed files with 6 additions and 0 deletions
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6
drivers/usb/misc/legousbtower.c
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@ -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);
}