aboutsummaryrefslogtreecommitdiff
path: root/drivers/usb/misc
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/usb/misc')
-rw-r--r--drivers/usb/misc/legousbtower.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/usb/misc/legousbtower.c b/drivers/usb/misc/legousbtower.c
index 97efeaec4d5..faa6d623de7 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);
}