Commit:     9313794371ad39e6bf88e1fbef8dfb3bd1ae3fe7
Parent:     74cda169fe65ca1dedad6d4a905b13c6ccd87351
Author:     Ulrich Kunitz <[EMAIL PROTECTED]>
AuthorDate: Sat Dec 1 11:26:05 2007 +0100
Committer:  John W. Linville <[EMAIL PROTECTED]>
CommitDate: Mon Dec 17 17:01:39 2007 -0500

    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 <[EMAIL PROTECTED]>
    Signed-off-by: John W. Linville <[EMAIL PROTECTED]>
 drivers/net/wireless/zd1211rw/zd_mac.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/zd1211rw/zd_mac.c 
index a903645..5298a8b 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_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,
@@ -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");
                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);
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