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wl1251: fix 4-byte TX buffer alignment 

This implements TX buffer alignment for cloned or too small skb by
copying and replacing the original skb.
Recent changes in wireless-testing seems to make this really necessary.

Signed-off-by: David Gnedt <david.gnedt@davizone.at>
Acked-by: Kalle Valo <kvalo@adurom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
David Gnedt 2011-01-30 20:10:48 +01:00 committed by John W. Linville
parent e7332a4144
commit bb4793b3c6
1 changed files with 20 additions and 6 deletions
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26
drivers/net/wireless/wl1251/tx.c
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@ -213,16 +213,30 @@ static int wl1251_tx_send_packet(struct wl1251 *wl, struct sk_buff *skb,
wl1251_debug(DEBUG_TX, "skb offset %d", offset);
/* check whether the current skb can be used */
if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
unsigned char *src = skb->data;
if (skb_cloned(skb) || (skb_tailroom(skb) < offset)) {
struct sk_buff *newskb = skb_copy_expand(skb, 0, 3,
GFP_KERNEL);
/* align the buffer on a 4-byte boundary */
if (unlikely(newskb == NULL)) {
wl1251_error("Can't allocate skb!");
return -EINVAL;
}
tx_hdr = (struct tx_double_buffer_desc *) newskb->data;
dev_kfree_skb_any(skb);
wl->tx_frames[tx_hdr->id] = skb = newskb;
offset = (4 - (long)skb->data) & 0x03;
wl1251_debug(DEBUG_TX, "new skb offset %d", offset);
}
/* align the buffer on a 4-byte boundary */
if (offset) {
unsigned char *src = skb->data;
skb_reserve(skb, offset);
memmove(skb->data, src, skb->len);
tx_hdr = (struct tx_double_buffer_desc *) skb->data;
} else {
wl1251_info("No handler, fixme!");
return -EINVAL;
}
}