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authorMarco Porsch <marco.porsch@etit.tu-chemnitz.de>2012-11-22 06:40:31 +0400
committerJohannes Berg <johannes.berg@intel.com>2012-11-26 14:36:02 +0400
commit40aefedc8b494d6a7006ceb9d051fbc58268c86e (patch)
tree7c3aabbbd7640ae4ceffcaba20112a414760801b /net/mac80211/wme.c
parent65821635d26d3173a3b22781e2c60d5e6fcaeb22 (diff)
downloadlinux-40aefedc8b494d6a7006ceb9d051fbc58268c86e.tar.xz
mac80211: refactor ieee80211_set_qos_hdr
Return early if not a QoS Data frame. Give proper documentation. Signed-off-by: Marco Porsch <marco.porsch@etit.tu-chemnitz.de> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/wme.c')
-rw-r--r--net/mac80211/wme.c40
1 files changed, 23 insertions, 17 deletions
diff --git a/net/mac80211/wme.c b/net/mac80211/wme.c
index cea06e9f26f4..906f00cd6d2f 100644
--- a/net/mac80211/wme.c
+++ b/net/mac80211/wme.c
@@ -160,31 +160,37 @@ u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
return ieee80211_downgrade_queue(sdata, skb);
}
+/**
+ * ieee80211_set_qos_hdr - Fill in the QoS header if there is one.
+ *
+ * @sdata: local subif
+ * @skb: packet to be updated
+ */
void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_hdr *hdr = (void *)skb->data;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ u8 *p;
+ u8 ack_policy, tid;
- /* Fill in the QoS header if there is one. */
- if (ieee80211_is_data_qos(hdr->frame_control)) {
- u8 *p = ieee80211_get_qos_ctl(hdr);
- u8 ack_policy, tid;
-
- tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
+ if (!ieee80211_is_data_qos(hdr->frame_control))
+ return;
- /* preserve EOSP bit */
- ack_policy = *p & IEEE80211_QOS_CTL_EOSP;
+ p = ieee80211_get_qos_ctl(hdr);
+ tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
- if (is_multicast_ether_addr(hdr->addr1) ||
- sdata->noack_map & BIT(tid)) {
- ack_policy |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK;
- info->flags |= IEEE80211_TX_CTL_NO_ACK;
- }
+ /* preserve EOSP bit */
+ ack_policy = *p & IEEE80211_QOS_CTL_EOSP;
- /* qos header is 2 bytes */
- *p++ = ack_policy | tid;
- *p = ieee80211_vif_is_mesh(&sdata->vif) ?
- (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8) : 0;
+ if (is_multicast_ether_addr(hdr->addr1) ||
+ sdata->noack_map & BIT(tid)) {
+ ack_policy |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK;
+ info->flags |= IEEE80211_TX_CTL_NO_ACK;
}
+
+ /* qos header is 2 bytes */
+ *p++ = ack_policy | tid;
+ *p = ieee80211_vif_is_mesh(&sdata->vif) ?
+ (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8) : 0;
}