mac80211: advance the state machine immediately if no delay is needed

Instead of queueing the scan work again without delay just process the
next state immediately.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 15 insertions, 9 deletions

diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 71500f1dddbc..db122e4e60e5 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -587,15 +587,21 @@ void ieee80211_scan_work(struct work_struct *work)
                 return;
         }
 
-        switch (local->scan_state) {
-        case SCAN_SET_CHANNEL:
-                if (ieee80211_scan_state_set_channel(local, &next_delay))
-                        return;
-                break;
-        case SCAN_SEND_PROBE:
-                ieee80211_scan_state_send_probe(local, &next_delay);
-                break;
-        }
+        /*
+         * as long as no delay is required advance immediately
+         * without scheduling a new work
+         */
+        do {
+                switch (local->scan_state) {
+                case SCAN_SET_CHANNEL:
+                        if (ieee80211_scan_state_set_channel(local, &next_delay))
+                                return;
+                        break;
+                case SCAN_SEND_PROBE:
+                        ieee80211_scan_state_send_probe(local, &next_delay);
+                        break;
+                }
+        } while (next_delay == 0);
 
         queue_delayed_work(local->hw.workqueue, &local->scan_work,
                            next_delay);