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can: export a safe netdev_priv wrapper for candev

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In net_device notifier calls, it was impossible to determine
if a CAN device is based on candev in a safe way.
This patch adds such test in order to access candev storage
from within those notifiers.

Signed-off-by: Kurt Van Dijck <kurt.van.dijck@eia.be>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Fabio Baltieri <fabio.baltieri@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Kurt Van Dijck 2012-12-18 18:50:56 +01:00 • committed by Marc Kleine-Budde
commit bf03a5379c
2 changed files with 16 additions and 0 deletions
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13
drivers/net/can/dev.c
View file

@ -794,6 +794,19 @@ void unregister_candev(struct net_device *dev)
}
EXPORT_SYMBOL_GPL(unregister_candev);
/*
* Test if a network device is a candev based device
* and return the can_priv* if so.
*/
struct can_priv *safe_candev_priv(struct net_device *dev)
{
if ((dev->type != ARPHRD_CAN) || (dev->rtnl_link_ops != &can_link_ops))
return NULL;
return netdev_priv(dev);
}
EXPORT_SYMBOL_GPL(safe_candev_priv);
static __init int can_dev_init(void)
{
int err;

3
include/linux/can/dev.h
View file

@ -106,6 +106,9 @@ u8 can_len2dlc(u8 len);
struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max);
void free_candev(struct net_device *dev);
/* a candev safe wrapper around netdev_priv */
struct can_priv *safe_candev_priv(struct net_device *dev);
int open_candev(struct net_device *dev);
void close_candev(struct net_device *dev);