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f_phonet: avoid pskb_pull(), fix OOPS with CONFIG_HIGHMEM

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This is similar to what we already do in cdc-phonet.c in the same
situation. pskb_pull() refuses to work with HIGHMEM, even if it is
known that the socket buffer is entirely in "low" memory.

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rémi Denis-Courmont 2011-02-23 02:51:33 +00:00 committed by David S. Miller
parent 9eb0e6f26e
commit f5a4532528
1 changed files with 10 additions and 5 deletions
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15
drivers/usb/gadget/f_phonet.c
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@ -346,14 +346,19 @@ static void pn_rx_complete(struct usb_ep *ep, struct usb_request *req)
if (unlikely(!skb))
break;
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, 0,
req->actual);
if (skb->len == 0) { /* First fragment */
skb->protocol = htons(ETH_P_PHONET);
skb_reset_mac_header(skb);
/* Can't use pskb_pull() on page in IRQ */
memcpy(skb_put(skb, 1), page_address(page), 1);
}
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
skb->len == 0, req->actual);
page = NULL;
if (req->actual < req->length) { /* Last fragment */
skb->protocol = htons(ETH_P_PHONET);
skb_reset_mac_header(skb);
pskb_pull(skb, 1);
skb->dev = dev;
dev->stats.rx_packets++;
dev->stats.rx_bytes += skb->len;