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Commit e618834e authored by James Maki's avatar James Maki Committed by Greg Kroah-Hartman
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USB: option.c: option_indat_callback: Resubmit some unsuccessful URBs 



All unsuccessful (non-zero status) URBs were being dropped. After N_IN_URBs are
dropped you will no longer be able to receive data.

This patch resubmits unsuccessful URBs unless the status indicates that it should
be terminated. The statuses that indicate the URB should be terminated was
gathered from other similar drivers.

Signed-off-by: default avatarJames Maki <jamescmaki@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 71adf118

drivers/usb/serial/option.c

+30 −19
Original line number Diff line number Diff line
@@ -1021,29 +1021,40 @@ static void option_indat_callback(struct urb *urb) 
	endpoint = usb_pipeendpoint(urb->pipe);

	port = urb->context;



	if (status) {

	switch (status) {

	case 0:

		/* success */

		break;

	case -ECONNRESET:

	case -ENOENT:

	case -ESHUTDOWN:

		/* this urb is terminated, clean up */

		dbg("%s: urb shutting down with status: %d on endpoint %02x.",

		    __func__, status, endpoint);

		return;

	default:

		dbg("%s: nonzero status: %d on endpoint %02x.",

		    __func__, status, endpoint);

	} else {

		tty = tty_port_tty_get(&port->port);

		goto exit;

	}



	if (urb->actual_length) {

		tty = tty_port_tty_get(&port->port);

		tty_insert_flip_string(tty, data, urb->actual_length);

		tty_flip_buffer_push(tty);

		tty_kref_put(tty);

	} else

		dbg("%s: empty read urb received", __func__);

		tty_kref_put(tty);



exit:

	/* Resubmit urb so we continue receiving */

		if (status != -ESHUTDOWN) {

	err = usb_submit_urb(urb, GFP_ATOMIC);

	if (err && err != -EPERM)

		printk(KERN_ERR "%s: resubmit read urb failed. "

			"(%d)", __func__, err);

	else

		usb_mark_last_busy(port->serial->dev);

		}



	}

	return;

}