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can: only rename enabled led triggers when changing the netdev name 

Commit a1ef7bd9fc ("can: rename LED trigger name on netdev renames") renames
the led trigger names according to the changed netdevice name.

As not every CAN driver supports and initializes the led triggers, checking for
the CAN private datastructure with safe_candev_priv() in the notifier chain is
not enough.

This patch adds a check when CONFIG_CAN_LEDS is enabled and the driver does not
support led triggers.

For stable 3.9+

Cc: Fabio Baltieri <fabio.baltieri@gmail.com>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Acked-by: Kurt Van Dijck <dev.kurt@vandijck-laurijssen.be>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Oliver Hartkopp 2014-05-27 13:30:56 +02:00 committed by Marc Kleine-Budde
parent 8646224cdb
commit 45fb4f8d81
1 changed files with 3 additions and 0 deletions
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3
drivers/net/can/led.c
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@ -97,6 +97,9 @@ static int can_led_notifier(struct notifier_block *nb, unsigned long msg,
if (!priv)
return NOTIFY_DONE;
if (!priv->tx_led_trig || !priv->rx_led_trig)
return NOTIFY_DONE;
if (msg == NETDEV_CHANGENAME) {
snprintf(name, sizeof(name), "%s-tx", netdev->name);
led_trigger_rename_static(name, priv->tx_led_trig);