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authorWolfgang Grandegger <wg@grandegger.com>2009-10-20 00:08:01 -0700
committerDavid S. Miller <davem@davemloft.net>2009-10-20 00:08:01 -0700
commit7b6856a0296a8f187bb88ba31fa83a08abba7966 (patch)
tree0afbcc9291eeb368e4e4616b6eed9062df646de0 /drivers/net/can/usb
parent0eae750e6019a93643063924209c1daf9cb9b4a7 (diff)
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/usb')
-rw-r--r--drivers/net/can/usb/ems_usb.c16
1 files changed, 2 insertions, 14 deletions
diff --git a/drivers/net/can/usb/ems_usb.c b/drivers/net/can/usb/ems_usb.c
index a65f56a9cd3d..3685f3e42d12 100644
--- a/drivers/net/can/usb/ems_usb.c
+++ b/drivers/net/can/usb/ems_usb.c
@@ -311,14 +311,10 @@ static void ems_usb_rx_can_msg(struct ems_usb *dev, struct ems_cpc_msg *msg)
int i;
struct net_device_stats *stats = &dev->netdev->stats;
- skb = netdev_alloc_skb(dev->netdev, sizeof(struct can_frame));
+ skb = alloc_can_skb(dev->netdev, &cf);
if (skb == NULL)
return;
- skb->protocol = htons(ETH_P_CAN);
-
- cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
-
cf->can_id = msg->msg.can_msg.id;
cf->can_dlc = min_t(u8, msg->msg.can_msg.length, 8);
@@ -346,18 +342,10 @@ static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg)
struct sk_buff *skb;
struct net_device_stats *stats = &dev->netdev->stats;
- skb = netdev_alloc_skb(dev->netdev, sizeof(struct can_frame));
+ skb = alloc_can_err_skb(dev->netdev, &cf);
if (skb == NULL)
return;
- 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 (msg->type == CPC_MSG_TYPE_CAN_STATE) {
u8 state = msg->msg.can_state;