cfg80211/mac80211: allow management TX to not wait for ACK

For probe responses it can be useful to not wait for ACK to
avoid retransmissions if the station that sent the probe is
already on the next channel, so allow userspace to request
not caring about the ACK with a new nl80211 flag.

Since mac80211 needs to be updated for the new function
prototype anyway implement it right away -- it's just a
few lines of code.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 8 insertions, 3 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index e072fea69a30..ab3258ac0b2c 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1936,7 +1936,7 @@ static int ieee80211_mgmt_tx(struct wiphy *wiphy, struct net_device *dev,
                              enum nl80211_channel_type channel_type,
                              bool channel_type_valid, unsigned int wait,
                              const u8 *buf, size_t len, bool no_cck,
-                             u64 *cookie)
+                             bool dont_wait_for_ack, u64 *cookie)
 {
         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
         struct ieee80211_local *local = sdata->local;
@@ -1944,10 +1944,15 @@ static int ieee80211_mgmt_tx(struct wiphy *wiphy, struct net_device *dev,
         struct sta_info *sta;
         struct ieee80211_work *wk;
         const struct ieee80211_mgmt *mgmt = (void *)buf;
-        u32 flags = IEEE80211_TX_INTFL_NL80211_FRAME_TX |
-                    IEEE80211_TX_CTL_REQ_TX_STATUS;
+        u32 flags;
         bool is_offchan = false;
 
+        if (dont_wait_for_ack)
+                flags = IEEE80211_TX_CTL_NO_ACK;
+        else
+                flags = IEEE80211_TX_INTFL_NL80211_FRAME_TX |
+                        IEEE80211_TX_CTL_REQ_TX_STATUS;
+
         /* Check that we are on the requested channel for transmission */
         if (chan != local->tmp_channel &&
             chan != local->oper_channel)