[PATCH] d80211: extend extra_hdr_room to be a bytecount

[Michael Buesch <mb@bu3sch.de>]

Extend ieee80211_hw's extra_hdr_room to be a bytecount for
a device specific TX header instead of being a hardcoded
0/2 byte choice.

Signed-off-by: Michael Buesch <mb@bu3sch.de>

diff --git a/include/net/d80211.h b/include/net/d80211.h
index a80f48b..9e9709f 100644
--- a/include/net/d80211.h
+++ b/include/net/d80211.h
@@ -476,10 +476,6 @@ struct ieee80211_hw {
 	/* Force software encryption for TKIP packets if WMM is enabled. */
 	unsigned int no_tkip_wmm_hwaccel:1;
 
-	/* set if the payload needs to be padded at even boundaries after the
-	 * header */
-	unsigned int extra_hdr_room:1;
-
 	/* Some devices handle Michael MIC internally and do not include MIC in
 	 * the received packets passed up. device_strips_mic must be set
 	 * for such devices. The 'encryption' frame control bit is expected to
@@ -496,6 +492,9 @@ struct ieee80211_hw {
 	 * i.e. more than one skb per frame */
 	unsigned int fraglist:1;
 
+	/* Set to the size of a needed device specific skb headroom for TX skbs. */
+	unsigned int extra_hdr_room;
+
         /* This is the time in us to change channels
          */
         int channel_change_time;
diff --git a/net/d80211/ieee80211.c b/net/d80211/ieee80211.c
index 1ef2707..7d52c3b 100644
--- a/net/d80211/ieee80211.c
+++ b/net/d80211/ieee80211.c
@@ -1551,7 +1551,7 @@ static int ieee80211_subif_start_xmit(st
 	 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
 	 * alloc_skb() (net/core/skbuff.c)
 	 */
-	head_need = hdrlen + encaps_len + (local->hw->extra_hdr_room ? 2 : 0);
+	head_need = hdrlen + encaps_len + local->hw->extra_hdr_room;
 	head_need -= skb_headroom(skb);
 
 	/* We are going to modify skb data, so make a copy of it if happens to


-- 
Greetings Michael.