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| author | Marc Kleine-Budde <mkl@pengutronix.de> | 2020-09-16 00:35:01 +0200 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2020-09-21 10:13:16 +0200 |
| commit | 80a71815d8cd1be6481ad16fad3167f095045a06 (patch) | |
| tree | aa6aab3cedaf7badf758ff83064715ab4d8f7fc0 /drivers/net/can/dev.c | |
| parent | can: dev: can_put_echo_skb(): print number of echo_skb that is occupied (diff) | |
| download | linux-80a71815d8cd1be6481ad16fad3167f095045a06.tar.xz linux-80a71815d8cd1be6481ad16fad3167f095045a06.zip | |
can: dev: can_put_echo_skb(): propagate error in case of errors
The function can_put_echo_skb() can fail for several reasons. It may
fail due to OOM, but when it fails it's usually due to locking problems
in the driver.
In order to help developing and debugging of new drivers propagate error
value in case of errors.
Link: https://lore.kernel.org/r/20200915223527.1417033-12-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'drivers/net/can/dev.c')
| -rw-r--r-- | drivers/net/can/dev.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c index dd443e5d8cb7..77a5663693af 100644 --- a/drivers/net/can/dev.c +++ b/drivers/net/can/dev.c @@ -434,8 +434,8 @@ static void can_flush_echo_skb(struct net_device *dev) * of the device driver. The driver must protect access to * priv->echo_skb, if necessary. */ -void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev, - unsigned int idx) +int can_put_echo_skb(struct sk_buff *skb, struct net_device *dev, + unsigned int idx) { struct can_priv *priv = netdev_priv(dev); @@ -446,13 +446,13 @@ void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev, (skb->protocol != htons(ETH_P_CAN) && skb->protocol != htons(ETH_P_CANFD))) { kfree_skb(skb); - return; + return 0; } if (!priv->echo_skb[idx]) { skb = can_create_echo_skb(skb); if (!skb) - return; + return -ENOMEM; /* make settings for echo to reduce code in irq context */ skb->pkt_type = PACKET_BROADCAST; @@ -465,7 +465,10 @@ void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev, /* locking problem with netif_stop_queue() ?? */ netdev_err(dev, "%s: BUG! echo_skb %d is occupied!\n", __func__, idx); kfree_skb(skb); + return -EBUSY; } + + return 0; } EXPORT_SYMBOL_GPL(can_put_echo_skb); |