linux-kernel - [RFC PATCH 08/13] can: slcan: send the open command to the adapter

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Message-Id: <20220607094752.1029295-9-dario.binacchi@amarulasolutions.com>
Date:   Tue,  7 Jun 2022 11:47:47 +0200
From:   Dario Binacchi <dario.binacchi@...rulasolutions.com>
To:     linux-kernel@...r.kernel.org
Cc:     Amarula patchwork <linux-amarula@...rulasolutions.com>,
        michael@...rulasolutions.com,
        Dario Binacchi <dario.binacchi@...rulasolutions.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Paolo Abeni <pabeni@...hat.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org
Subject: [RFC PATCH 08/13] can: slcan: send the open command to the adapter

In case the bitrate has been set via ip tool, it sends the open command
("O\r") to the adapter.

Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
---

 drivers/net/can/slcan.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/slcan.c b/drivers/net/can/slcan.c
index f1bf32b70c4d..f18097c62222 100644
--- a/drivers/net/can/slcan.c
+++ b/drivers/net/can/slcan.c
@@ -469,8 +469,15 @@ static int slc_open(struct net_device *dev)
 	 * can.bittiming.bitrate is 0, causing open_candev() to fail.
 	 * So let's set to a fake value.
 	 */
-	if (sl->can.bittiming.bitrate == 0)
+	if (sl->can.bittiming.bitrate == 0) {
 		sl->can.bittiming.bitrate = -1UL;
+	} else {
+		err = slcan_transmit_cmd(sl, "O\r");
+		if (err) {
+			netdev_err(dev, "failed to send open command 'O\\r'\n");
+			return err;
+		}
+	}
 
 	err = open_candev(dev);
 	if (err) {
-- 
2.32.0