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Commit da380bf1 authored by Bin Liu's avatar Bin Liu Committed by Greg Kroah-Hartman
Browse files

USB: serial: usb_wwan: do not resubmit rx urb on fatal errors 



commit 986c1748c84d7727defeaeca74a73b37f7d5cce1 upstream.

usb_wwan_indat_callback() shouldn't resubmit rx urb if the previous urb
status is a fatal error. Or the usb controller would keep processing the
new urbs then run into interrupt storm, and has no chance to recover.

Fixes: 6c1ee66a ("USB-Serial: Fix error handling of usb_wwan")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarBin Liu <b-liu@ti.com>
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ff9afd12

drivers/usb/serial/usb_wwan.c

+4 −0
Original line number Diff line number Diff line
@@ -302,6 +302,10 @@ static void usb_wwan_indat_callback(struct urb *urb) 
	if (status) {

		dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n",

			__func__, status, endpoint);



		/* don't resubmit on fatal errors */

		if (status == -ESHUTDOWN || status == -ENOENT)

			return;

	} else {

		if (urb->actual_length) {

			tty_insert_flip_string(&port->port, data,