diff options
| author | Michael Buesch <mb@bu3sch.de> | 2007-12-29 17:24:23 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-28 15:09:30 -0800 |
| commit | 9081728b5f08f8137973c70e172c47ccb0dd33c9 (patch) | |
| tree | 0469a1659a20b13ac48ff02b423800e181271c0b | |
| parent | 01c20986cb2c2aa9c66603e9be14be5ebae99aca (diff) | |
zd1211rw: fix alignment for QOS and WDS frames
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@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
| -rw-r--r-- | drivers/net/wireless/zd1211rw/zd_mac.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/net/wireless/zd1211rw/zd_mac.c b/drivers/net/wireless/zd1211rw/zd_mac.c index 14fb727583d..7b869305048 100644 --- a/drivers/net/wireless/zd1211rw/zd_mac.c +++ b/drivers/net/wireless/zd1211rw/zd_mac.c @@ -623,6 +623,8 @@ int zd_mac_rx(struct ieee80211_hw *hw, const u8 *buffer, unsigned int length) 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, const u8 *buffer, unsigned int length) && !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); |