iwlwifi: allocate 128 bytes linear buffer for rx skb

Allocate 128 bytes linear buffer for rx skb. The first 64 bytes is
reserved for mac80211 usage (for radiotap header expansion, etc).
The frame header starts from the second 64 bytes.

Cc: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 4 insertions, 2 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-3945.c b/drivers/net/wireless/iwlwifi/iwl-3945.c
index 09a7bd2c0be4..26a1134f84a2 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945.c
+++ b/drivers/net/wireless/iwlwifi/iwl-3945.c
@@ -564,7 +564,7 @@ static void iwl3945_pass_packet_to_mac80211(struct iwl_priv *priv,
                 return;
         }
 
-        skb = alloc_skb(IWL_LINK_HDR_MAX, GFP_ATOMIC);
+        skb = alloc_skb(IWL_LINK_HDR_MAX * 2, GFP_ATOMIC);
         if (!skb) {
                 IWL_ERR(priv, "alloc_skb failed\n");
                 return;
@@ -575,6 +575,7 @@ static void iwl3945_pass_packet_to_mac80211(struct iwl_priv *priv,
                                        (struct ieee80211_hdr *)rxb_addr(rxb),
                                        le32_to_cpu(rx_end->status), stats);
 
+        skb_reserve(skb, IWL_LINK_HDR_MAX);
         skb_add_rx_frag(skb, 0, rxb->page,
                         (void *)rx_hdr->payload - (void *)pkt, len);
 
diff --git a/drivers/net/wireless/iwlwifi/iwl-rx.c b/drivers/net/wireless/iwlwifi/iwl-rx.c
index e5339c9ad13e..d2dc7cceb5f2 100644
--- a/drivers/net/wireless/iwlwifi/iwl-rx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-rx.c
@@ -937,12 +937,13 @@ static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
             iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
                 return;
 
-        skb = alloc_skb(IWL_LINK_HDR_MAX, GFP_ATOMIC);
+        skb = alloc_skb(IWL_LINK_HDR_MAX * 2, GFP_ATOMIC);
         if (!skb) {
                 IWL_ERR(priv, "alloc_skb failed\n");
                 return;
         }
 
+        skb_reserve(skb, IWL_LINK_HDR_MAX);
         skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len);
 
         /* mac80211 currently doesn't support paged SKB. Convert it to