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| author | David S. Miller <davem@davemloft.net> | 2010-01-04 15:33:22 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-01-04 15:33:22 -0800 |
| commit | 5958eed76ccc8c361f872829bdc4b8c6dc9cd379 (patch) | |
| tree | 8f8dfcced082db674b0ae3ca3af9fdb6dde59dae /include/linux/can/dev.h | |
| parent | c7c17c2779075e675cb3c7fe2ecde67e226771fb (diff) | |
| parent | c5974b835a909ff15c3b7e6cf6789b5eb919f419 (diff) | |
Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
Diffstat (limited to 'include/linux/can/dev.h')
| -rw-r--r-- | include/linux/can/dev.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h index 1ed2a5cc03f5..3db7767d2a17 100644 --- a/include/linux/can/dev.h +++ b/include/linux/can/dev.h @@ -51,6 +51,15 @@ struct can_priv { struct sk_buff **echo_skb; }; +/* + * get_can_dlc(value) - helper macro to cast a given data length code (dlc) + * to __u8 and ensure the dlc value to be max. 8 bytes. + * + * To be used in the CAN netdriver receive path to ensure conformance with + * ISO 11898-1 Chapter 8.4.2.3 (DLC field) + */ +#define get_can_dlc(i) (min_t(__u8, (i), 8)) + struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max); void free_candev(struct net_device *dev); |