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staging: et131x: Use skb_headlen() where appropriate 

(skb->len - skb->data_len) is used in several places in the et131x
driver code. Converted all instances of this to use skb_headlen()
which is more readable.

Signed-off-by: Mark Einon <mark.einon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mark Einon 2012-10-17 22:15:11 +01:00 committed by Greg Kroah-Hartman
parent 355d8ae57b
commit f1b540b92c
1 changed files with 9 additions and 16 deletions
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25
drivers/staging/et131x/et131x.c
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@ -3313,12 +3313,11 @@ static int nic_send_packet(struct et131x_adapter *adapter, struct tcb *tcb)
* This will work until we determine why the hardware
* doesn't seem to like large fragments.
*/
if ((skb->len - skb->data_len) <= 1514) {
if (skb_headlen(skb) <= 1514) {
desc[frag].addr_hi = 0;
/* Low 16bits are length, high is vlan and
unused currently so zero */
desc[frag].len_vlan =
skb->len - skb->data_len;
desc[frag].len_vlan = skb_headlen(skb);
/* NOTE: Here, the dma_addr_t returned from
* dma_map_single() is implicitly cast as a
@ -3331,13 +3330,11 @@ static int nic_send_packet(struct et131x_adapter *adapter, struct tcb *tcb)
desc[frag++].addr_lo =
dma_map_single(&adapter->pdev->dev,
skb->data,
skb->len -
skb->data_len,
skb_headlen(skb),
DMA_TO_DEVICE);
} else {
desc[frag].addr_hi = 0;
desc[frag].len_vlan =
(skb->len - skb->data_len) / 2;
desc[frag].len_vlan = skb_headlen(skb) / 2;
/* NOTE: Here, the dma_addr_t returned from
* dma_map_single() is implicitly cast as a
@ -3350,13 +3347,11 @@ static int nic_send_packet(struct et131x_adapter *adapter, struct tcb *tcb)
desc[frag++].addr_lo =
dma_map_single(&adapter->pdev->dev,
skb->data,
((skb->len -
skb->data_len) / 2),
(skb_headlen(skb) / 2),
DMA_TO_DEVICE);
desc[frag].addr_hi = 0;
desc[frag].len_vlan =
(skb->len - skb->data_len) / 2;
desc[frag].len_vlan = skb_headlen(skb) / 2;
/* NOTE: Here, the dma_addr_t returned from
* dma_map_single() is implicitly cast as a
@ -3369,10 +3364,8 @@ static int nic_send_packet(struct et131x_adapter *adapter, struct tcb *tcb)
desc[frag++].addr_lo =
dma_map_single(&adapter->pdev->dev,
skb->data +
((skb->len -
skb->data_len) / 2),
((skb->len -
skb->data_len) / 2),
(skb_headlen(skb) / 2),
(skb_headlen(skb) / 2),
DMA_TO_DEVICE);
}
} else {
@ -3521,7 +3514,7 @@ static int send_packet(struct sk_buff *skb, struct et131x_adapter *adapter)
tcb->skb = skb;
if (skb->data != NULL && skb->len - skb->data_len >= 6) {
if (skb->data != NULL && skb_headlen(skb) >= 6) {
shbufva = (u16 *) skb->data;
if ((shbufva[0] == 0xffff) &&