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authorUlrich Kunitz <kune@deine-taler.de>2007-12-01 11:26:05 +0100
committerJohn W. Linville <linville@tuxdriver.com>2007-12-17 17:01:39 -0500
commit9313794371ad39e6bf88e1fbef8dfb3bd1ae3fe7 (patch)
tree356611f6b8e5bc8e3df52286c41a87db37a589db /drivers/net/wireless/zd1211rw/zd_mac.c
parent74cda169fe65ca1dedad6d4a905b13c6ccd87351 (diff)
zd1211rw: Fix alignment problems
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>
Diffstat (limited to 'drivers/net/wireless/zd1211rw/zd_mac.c')
-rw-r--r--drivers/net/wireless/zd1211rw/zd_mac.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/net/wireless/zd1211rw/zd_mac.c b/drivers/net/wireless/zd1211rw/zd_mac.c
index a903645e157..5298a8bf112 100644
--- a/drivers/net/wireless/zd1211rw/zd_mac.c
+++ b/drivers/net/wireless/zd1211rw/zd_mac.c
@@ -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);