Hi,
poll should return disconnect if a device is disconnected.
Regards
Oliver
Signed-off-by: Oliver Neukum <oliver@xxxxxxxxxx>
--
commit 55975e6edd85e1c38a268a17fb3da9e79f5a4f84
Author: Oliver Neukum <oneukum@linux-d698.(none)>
Date: Thu Jul 2 11:56:47 2009 +0200
usb: make legousbtower's poll react to disconnect
poll needs to return an error if a device is disconnected
- make poll check for device's presence
- wake all waiters in disconnect
diff --git a/drivers/usb/misc/legousbtower.c b/drivers/usb/misc/legousbtower.c
index c1e2433..046b863 100644
--- a/drivers/usb/misc/legousbtower.c
+++ b/drivers/usb/misc/legousbtower.c
@@ -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);
}
--
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