can: flex_can: Correct the checking for frame length in flexcan_start_xmit()

[ Upstream commit 13454c14550065fcc1705d6bd4ee6d40e057099f ]

The flexcan_start_xmit() function compares the frame length with data
register length to write frame content into data[0] and data[1]
register. Data register length is 4 bytes and frame maximum length is 8
bytes.

Fix the check that compares frame length with 3. Because the register
length is 4.

Signed-off-by: Luu An Phu <phu.luuan@nxp.com>
Reviewed-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index c4d1140116ea26d4f803971ba18a8fb934801ea2..ed8a2a7ce500a74c6fb377d45471c11f384d3616 100644 (file)
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -526,7 +526,7 @@ static int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev)
                data = be32_to_cpup((__be32 *)&cf->data[0]);
                flexcan_write(data, &priv->tx_mb->data[0]);
        }
-       if (cf->can_dlc > 3) {
+       if (cf->can_dlc > 4) {
                data = be32_to_cpup((__be32 *)&cf->data[4]);
                flexcan_write(data, &priv->tx_mb->data[1]);
        }