From: Wolfgang Grandegger <wg@grandegger.com>
To: netdev@vger.kernel.org
Cc: linux-can@vger.kernel.org
Subject: [PATCH net-next] can: cc770: store echo skb before starting the transfer
Date: Mon, 12 Dec 2011 16:07:16 +0100 [thread overview]
Message-ID: <4EE618A4.80104@grandegger.com> (raw)
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>
---
drivers/net/can/cc770/cc770.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/drivers/net/can/cc770/cc770.c b/drivers/net/can/cc770/cc770.c
index 7668967..c30f0e6 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
--
1.7.4.1
next reply other threads:[~2011-12-12 15:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-12 15:07 Wolfgang Grandegger [this message]
2012-01-31 21:59 ` [PATCH net-next] can: cc770: store echo skb before starting the transfer Marc Kleine-Budde
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