can: ucan: fix non-atomic allocation in completion handler

USB completion handlers are called in atomic context and must
specifically not allocate memory using GFP_KERNEL.

Fixes: 9f2d3eae88d2 ("can: ucan: add driver for Theobroma Systems UCAN devices")
Cc: stable <stable@vger.kernel.org>     # 4.19
Cc: Jakob Unterwurzacher <jakob.unterwurzacher@theobroma-systems.com>
Cc: Martin Elshuber <martin.elshuber@theobroma-systems.com>
Cc: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/usb/ucan.c b/drivers/net/can/usb/ucan.c
index 04aac3b..81e942f 100644 (file)
--- a/drivers/net/can/usb/ucan.c
+++ b/drivers/net/can/usb/ucan.c
@@ -792,7 +792,7 @@ resubmit:
                          up);
 
        usb_anchor_urb(urb, &up->rx_urbs);
-       ret = usb_submit_urb(urb, GFP_KERNEL);
+       ret = usb_submit_urb(urb, GFP_ATOMIC);
 
        if (ret < 0) {
                netdev_err(up->netdev,