This patch fixes RX packet alignment issues in the zd1211rw driver.
This is based on a patch by Johannes Berg.
Signed-off-by: Michael Buesch <mb@xxxxxxxxx>
Index: wireless-2.6/drivers/net/wireless/zd1211rw/zd_mac.c
===================================================================
--- wireless-2.6.orig/drivers/net/wireless/zd1211rw/zd_mac.c 2007-12-29 17:14:41.000000000 +0100
+++ wireless-2.6/drivers/net/wireless/zd1211rw/zd_mac.c 2007-12-29 17:15:00.000000000 +0100
@@ -623,6 +623,8 @@ int zd_mac_rx(struct ieee80211_hw *hw, c
const struct rx_status *status;
struct sk_buff *skb;
int bad_frame = 0;
+ u16 fc;
+ bool is_qos, is_4addr, need_padding;
if (length < ZD_PLCP_HEADER_SIZE + 10 /* IEEE80211_1ADDR_LEN */ +
FCS_LEN + sizeof(struct rx_status))
@@ -674,9 +676,22 @@ int zd_mac_rx(struct ieee80211_hw *hw, c
&& !mac->pass_ctrl)
return 0;
- skb = dev_alloc_skb(length);
+ fc = le16_to_cpu(*((__le16 *) buffer));
+
+ is_qos = ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
+ ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_QOS_DATA);
+ is_4addr = (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
+ (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS);
+ need_padding = is_qos ^ is_4addr;
+
+ skb = dev_alloc_skb(length + (need_padding ? 2 : 0));
if (skb == NULL)
return -ENOMEM;
+ if (need_padding) {
+ /* Make sure the the payload data is 4 byte aligned. */
+ skb_reserve(skb, 2);
+ }
+
memcpy(skb_put(skb, length), buffer, length);
ieee80211_rx_irqsafe(hw, skb, &stats);
-
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