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can: c_can: fix calculation of transmitted bytes on tx complete

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The number of bytes transmitted was not updated correctly, if several CAN
messages (with different length) were transmitted in one 'bunch'. Thus
programs like 'ifconfig' showed wrong transmit byte counts. Reason was, that
the message object whose DLC is to be read was not necessarily the active one
at the time when

    priv->read_reg(priv, C_CAN_IFACE(MSGCTRL_REG, 0)) & IF_MCONT_DLC_MASK;

was executed.

Signed-off-by: Holger Bechtold <Holger.Bechtold@gmx.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Holger Bechtold 2013-11-25 15:48:19 +01:00 committed by Marc Kleine-Budde
parent e35d46adc4
commit 7ee330c7b3
1 changed files with 1 additions and 0 deletions
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1
drivers/net/can/c_can/c_can.c
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@ -763,6 +763,7 @@ static void c_can_do_tx(struct net_device *dev)
if (!(val & (1 << (msg_obj_no - 1)))) { if (!(val & (1 << (msg_obj_no - 1)))) {
can_get_echo_skb(dev, can_get_echo_skb(dev,
msg_obj_no - C_CAN_MSG_OBJ_TX_FIRST); msg_obj_no - C_CAN_MSG_OBJ_TX_FIRST);
c_can_object_get(dev, 0, msg_obj_no, IF_COMM_ALL);
stats->tx_bytes += priv->read_reg(priv, stats->tx_bytes += priv->read_reg(priv,
C_CAN_IFACE(MSGCTRL_REG, 0)) C_CAN_IFACE(MSGCTRL_REG, 0))
& IF_MCONT_DLC_MASK; & IF_MCONT_DLC_MASK;