Messages in this thread | | | Date | Mon, 10 Sep 2012 20:22:03 +0200 | From | Oliver Hartkopp <> | Subject | Re: [PATCH] can: export a safe netdev_priv wrapper for candev |
| |
On 10.09.2012 16:25, Kurt Van Dijck wrote:
> can: export a safe netdev_priv wrapper for candev > > 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> > > diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c > index 963e2cc..6c1e704 100644 > --- a/drivers/net/can/dev.c > +++ b/drivers/net/can/dev.c > @@ -795,6 +795,18 @@ 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;
Nice idea!
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
> + > + return netdev_priv(dev); > +} > + > static __init int can_dev_init(void) > { > int err; > diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h > index 7747d9b..fb0ab65 100644 > --- a/include/linux/can/dev.h > +++ b/include/linux/can/dev.h > @@ -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); >
| |