linux-kernel - [PATCH 4.4 03/87] can: gs_usb: fix return value of the "set

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Message-Id: <20180115123349.611265515@linuxfoundation.org>
Date:   Mon, 15 Jan 2018 13:34:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 4.4 03/87] can: gs_usb: fix return value of the "set_bittiming" callback

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Wolfgang Grandegger <wg@...ndegger.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@...ndegger.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
@@ -430,7 +430,7 @@ 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)