USB: ldusb should signal an error in poll if the device is disconnected
poll() should test for a disconnection of the device.
Signed-off-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/misc/ldusb.c b/drivers/usb/misc/ldusb.c
index ad4fb15..90f1301 100644
--- a/drivers/usb/misc/ldusb.c
+++ b/drivers/usb/misc/ldusb.c
@@ -412,6 +412,9 @@
dev = file->private_data;
+ if (!dev->intf)
+ return POLLERR | POLLHUP;
+
poll_wait(file, &dev->read_wait, wait);
poll_wait(file, &dev->write_wait, wait);
@@ -767,6 +770,9 @@
ld_usb_delete(dev);
} else {
dev->intf = NULL;
+ /* wake up pollers */
+ wake_up_interruptible_all(&dev->read_wait);
+ wake_up_interruptible_all(&dev->write_wait);
mutex_unlock(&dev->mutex);
}