[PATCH] ipw2200: use generic ieee80211_get_hdrlen() to get packet length

replace ipw2200 specific frame_hdr_len() with generic
ieee80211 routine ieee80211_get_hdrlen()
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ipw2200.c

@@ -7895,7 +7895,8 @@ static void ipw_rx(struct ipw_priv *priv)
 					     le16_to_cpu(pkt->u.frame.length));
 
 				if (le16_to_cpu(pkt->u.frame.length) <
-				    frame_hdr_len(header)) {
+				    ieee80211_get_hdrlen(le16_to_cpu(
+						    header->frame_ctl))) {
 					IPW_DEBUG_DROP
 					    ("Received packet is too small. "
 					     "Dropping.\n");

drivers/net/wireless/ipw2200.h

@@ -1907,27 +1907,4 @@ struct ipw_cmd_log {
 
 #define IPW_MAX_CONFIG_RETRIES 10
 
-static inline u32 frame_hdr_len(struct ieee80211_hdr_4addr *hdr)
-{
-	u32 retval;
-	u16 fc;
-
-	retval = sizeof(struct ieee80211_hdr_3addr);
-	fc = le16_to_cpu(hdr->frame_ctl);
-
-	/*
-	 * Function     ToDS    FromDS
-	 * IBSS         0       0
-	 * To AP        1       0
-	 * From AP      0       1
-	 * WDS (bridge) 1       1
-	 *
-	 * Only WDS frames use Address4 among them. --YZ
-	 */
-	if (!(fc & IEEE80211_FCTL_TODS) || !(fc & IEEE80211_FCTL_FROMDS))
-		retval -= ETH_ALEN;
-
-	return retval;
-}
-
 #endif				/* __ipw2200_h__ */