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zd1211rw: Fix alignment problems

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Shaddy Baddah found an alignment problem with zd1211rw driver at
2007-11-19. This patch fixes it, it is based on the patch proposed by
Herbert Xu. The alignment 4 has been the agreed value on the
linux-wireless mailing list.

Notify that the problem does only affect the old zd1211rw softmac
driver and not the zd1211rw-mac80211 driver. Daniel Drake has
already provided a patch for the replacement of the softmac
driver, which this patch will break.

Signed-off-by: Ulrich Kunitz <kune@deine-taler.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ulrich Kunitz 2007-12-01 11:26:05 +01:00 committed by John W. Linville
parent 74cda169fe
commit 9313794371
1 changed files with 8 additions and 2 deletions
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10
drivers/net/wireless/zd1211rw/zd_mac.c
View file

@ -1130,6 +1130,8 @@ static void zd_mac_rx(struct zd_mac *mac, struct sk_buff *skb)
__skb_trim(skb, skb->len -
(IEEE80211_FCS_LEN + sizeof(struct rx_status)));
ZD_ASSERT(IS_ALIGNED((unsigned long)skb->data, 4));
update_qual_rssi(mac, skb->data, skb->len, stats.signal,
status->signal_strength);
@ -1166,15 +1168,19 @@ static void do_rx(unsigned long mac_ptr)
int zd_mac_rx_irq(struct zd_mac *mac, const u8 *buffer, unsigned int length)
{
struct sk_buff *skb;
unsigned int reserved =
ALIGN(max_t(unsigned int,
sizeof(struct zd_rt_hdr), ZD_PLCP_HEADER_SIZE), 4) -
ZD_PLCP_HEADER_SIZE;
skb = dev_alloc_skb(sizeof(struct zd_rt_hdr) + length);
skb = dev_alloc_skb(reserved + length);
if (!skb) {
struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
dev_warn(zd_mac_dev(mac), "Could not allocate skb.\n");
ieee->stats.rx_dropped++;
return -ENOMEM;
}
skb_reserve(skb, sizeof(struct zd_rt_hdr));
skb_reserve(skb, reserved);
memcpy(__skb_put(skb, length), buffer, length);
skb_queue_tail(&mac->rx_queue, skb);
tasklet_schedule(&mac->rx_tasklet);