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

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: 6c1ee66a0b2b ("USB-Serial: Fix error handling of usb_wwan")
Cc: stable@vger.kernel.org
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Johan Hovold <johan@kernel.org>

diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
index 13be21a..4b98458 100644 (file)
--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -270,6 +270,10 @@ 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,