diff options
| author | Wolfgang Grandegger <wg@grandegger.com> | 2009-10-20 07:08:01 (GMT) |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-10-20 07:08:01 (GMT) |
| commit | 7b6856a0296a8f187bb88ba31fa83a08abba7966 (patch) | |
| tree | 0afbcc9291eeb368e4e4616b6eed9062df646de0 /drivers/net/can/sja1000 | |
| parent | 0eae750e6019a93643063924209c1daf9cb9b4a7 (diff) | |
| download | linux-7b6856a0296a8f187bb88ba31fa83a08abba7966.tar.xz | |
can: provide library functions for skb allocation
This patch makes the private functions alloc_can_skb() and
alloc_can_err_skb() of the at91_can driver public and adapts all
drivers to use these. While making the patch I realized, that
the skb's are *not* setup consistently. It's now done as shown
below:
skb->protocol = htons(ETH_P_CAN);
skb->pkt_type = PACKET_BROADCAST;
skb->ip_summed = CHECKSUM_UNNECESSARY;
*cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
memset(*cf, 0, sizeof(struct can_frame));
The frame is zeroed out to avoid uninitialized data to be passed to
user space. Some drivers or library code did not set "pkt_type" or
"ip_summed". Also, "__constant_htons()" should not be used for
runtime invocations, as pointed out by David Miller.
Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/can/sja1000')
| -rw-r--r-- | drivers/net/can/sja1000/sja1000.c | 12 |
1 files changed, 2 insertions, 10 deletions
diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c index 96d8be4..1a9c595 100644 --- a/drivers/net/can/sja1000/sja1000.c +++ b/drivers/net/can/sja1000/sja1000.c @@ -296,11 +296,9 @@ static void sja1000_rx(struct net_device *dev) uint8_t dlc; int i; - skb = dev_alloc_skb(sizeof(struct can_frame)); + skb = alloc_can_skb(dev, &cf); if (skb == NULL) return; - skb->dev = dev; - skb->protocol = htons(ETH_P_CAN); fi = priv->read_reg(priv, REG_FI); dlc = fi & 0x0F; @@ -351,15 +349,9 @@ static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) enum can_state state = priv->can.state; uint8_t ecc, alc; - skb = dev_alloc_skb(sizeof(struct can_frame)); + skb = alloc_can_err_skb(dev, &cf); if (skb == NULL) return -ENOMEM; - skb->dev = dev; - skb->protocol = htons(ETH_P_CAN); - cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame)); - memset(cf, 0, sizeof(struct can_frame)); - cf->can_id = CAN_ERR_FLAG; - cf->can_dlc = CAN_ERR_DLC; if (isrc & IRQ_DOI) { /* data overrun interrupt */ |