Patch "can: gs_usb: fix return value of the "set_bittiming" callback" has been added to the 4.9-stable tree

Patch "can: gs_usb: fix return value of the "set_bittiming" callback" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    can: gs_usb: fix return value of the "set_bittiming" callback

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     can-gs_usb-fix-return-value-of-the-set_bittiming-callback.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From d5b42e6607661b198d8b26a0c30969605b1bf5c7 Mon Sep 17 00:00:00 2001
From: Wolfgang Grandegger <wg@grandegger.com>
Date: Wed, 13 Dec 2017 19:52:23 +0100
Subject: can: gs_usb: fix return value of the "set_bittiming" callback

From: Wolfgang Grandegger <wg@grandegger.com>

commit d5b42e6607661b198d8b26a0c30969605b1bf5c7 upstream.

The "set_bittiming" callback treats a positive return value as error!
For that reason "can_changelink()" will quit silently after setting
the bittiming values without processing ctrlmode, restart-ms, etc.

Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/can/usb/gs_usb.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -449,7 +449,7 @@ static int gs_usb_set_bittiming(struct n
 		dev_err(netdev->dev.parent, "Couldn't set bittimings (err=%d)",
 			rc);
 
-	return rc;
+	return (rc > 0) ? 0 : rc;
 }
 
 static void gs_usb_xmit_callback(struct urb *urb)


Patches currently in stable-queue which might be from wg@grandegger.com are

queue-4.9/can-gs_usb-fix-return-value-of-the-set_bittiming-callback.patch