mirror of https://gitee.com/openkylin/linux.git
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:
parent
e7332a4144
commit
bb4793b3c6
|
@ -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);
|
wl1251_debug(DEBUG_TX, "skb offset %d", offset);
|
||||||
|
|
||||||
/* check whether the current skb can be used */
|
/* check whether the current skb can be used */
|
||||||
if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
|
if (skb_cloned(skb) || (skb_tailroom(skb) < offset)) {
|
||||||
unsigned char *src = skb->data;
|
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);
|
skb_reserve(skb, offset);
|
||||||
memmove(skb->data, src, skb->len);
|
memmove(skb->data, src, skb->len);
|
||||||
tx_hdr = (struct tx_double_buffer_desc *) skb->data;
|
tx_hdr = (struct tx_double_buffer_desc *) skb->data;
|
||||||
} else {
|
|
||||||
wl1251_info("No handler, fixme!");
|
|
||||||
return -EINVAL;
|
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
Loading…
Reference in New Issue