can: cc770: store echo skb before starting the transfer

On slow systems and high CAN bitrates, the error message
"can_put_echo_skb: BUG! echo_skb is occupied!" did show up because
can_put_echo_skb() was called after starting the transfer.

Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/net/can/cc770/cc770.c b/drivers/net/can/cc770/cc770.c
index 766896747643..c30f0e6f1048 100644
--- a/drivers/net/can/cc770/cc770.c
+++ b/drivers/net/can/cc770/cc770.c
@@ -440,12 +440,14 @@ static netdev_tx_t cc770_start_xmit(struct sk_buff *skb, struct net_device *dev)
         for (i = 0; i < dlc; i++)
                 cc770_write_reg(priv, msgobj[mo].data[i], cf->data[i]);
 
+        /* Store echo skb before starting the transfer */
+        can_put_echo_skb(skb, dev, 0);
+
         cc770_write_reg(priv, msgobj[mo].ctrl1,
                         RMTPND_RES | TXRQST_SET | CPUUPD_RES | NEWDAT_UNC);
 
         stats->tx_bytes += dlc;
 
-        can_put_echo_skb(skb, dev, 0);
 
         /*
          * HM: We had some cases of repeated IRQs so make sure the