mac80211: comment allocation of mesh frames
Remove most references to magic numbers, save a few bytes and hopefully
improve readability.
Signed-off-by: Thomas Pedersen <thomas@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 48bbb96..f4dd339 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -2278,22 +2278,29 @@
} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
struct ieee80211_mgmt *mgmt;
u8 *pos;
+ int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
+ sizeof(mgmt->u.beacon);
#ifdef CONFIG_MAC80211_MESH
if (!sdata->u.mesh.mesh_id_len)
goto out;
#endif
- /* headroom, head length, tail length and maximum TIM length */
- skb = dev_alloc_skb(local->tx_headroom + 400 +
- sdata->u.mesh.ie_len);
+ skb = dev_alloc_skb(local->tx_headroom +
+ hdr_len +
+ 2 + /* NULL SSID */
+ 2 + 8 + /* supported rates */
+ 2 + 3 + /* DS params */
+ 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
+ 2 + sdata->u.mesh.mesh_id_len +
+ 2 + sizeof(struct ieee80211_meshconf_ie) +
+ sdata->u.mesh.ie_len);
if (!skb)
goto out;
skb_reserve(skb, local->hw.extra_tx_headroom);
- mgmt = (struct ieee80211_mgmt *)
- skb_put(skb, 24 + sizeof(mgmt->u.beacon));
- memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
+ mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
+ memset(mgmt, 0, hdr_len);
mgmt->frame_control =
cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
memset(mgmt->da, 0xff, ETH_ALEN);