regulatory: don't test list before iterating

There's no need to test whether a list is
empty or not before iterating.

Acked-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 52a3598..1496a10 100644 (file)
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -1104,9 +1104,6 @@ static void wiphy_update_beacon_reg(struct wiphy *wiphy)
 
        assert_cfg80211_lock();
 
-       if (list_empty(&reg_beacon_list))
-               return;
-
        list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
                if (!wiphy->bands[reg_beacon->chan.band])
                        continue;
@@ -1666,11 +1663,6 @@ static void reg_process_pending_beacon_hints(void)
        /* This goes through the _pending_ beacon list */
        spin_lock_bh(&reg_pending_beacons_lock);
 
-       if (list_empty(&reg_pending_beacons)) {
-               spin_unlock_bh(&reg_pending_beacons_lock);
-               goto out;
-       }
-
        list_for_each_entry_safe(pending_beacon, tmp,
                                 &reg_pending_beacons, list) {
 
@@ -1685,7 +1677,6 @@ static void reg_process_pending_beacon_hints(void)
        }
 
        spin_unlock_bh(&reg_pending_beacons_lock);
-out:
        mutex_unlock(&cfg80211_mutex);
 }
 
@@ -1949,34 +1940,24 @@ static void restore_regulatory_settings(bool reset_user)
         * settings.
         */
        spin_lock(&reg_requests_lock);
-       if (!list_empty(&reg_requests_list)) {
-               list_for_each_entry_safe(reg_request, tmp,
-                                        &reg_requests_list, list) {
-                       if (reg_request->initiator !=
-                           NL80211_REGDOM_SET_BY_USER)
-                               continue;
-                       list_move_tail(&reg_request->list, &tmp_reg_req_list);
-               }
+       list_for_each_entry_safe(reg_request, tmp, &reg_requests_list, list) {
+               if (reg_request->initiator != NL80211_REGDOM_SET_BY_USER)
+                       continue;
+               list_move_tail(&reg_request->list, &tmp_reg_req_list);
        }
        spin_unlock(&reg_requests_lock);
 
        /* Clear beacon hints */
        spin_lock_bh(&reg_pending_beacons_lock);
-       if (!list_empty(&reg_pending_beacons)) {
-               list_for_each_entry_safe(reg_beacon, btmp,
-                                        &reg_pending_beacons, list) {
-                       list_del(&reg_beacon->list);
-                       kfree(reg_beacon);
-               }
+       list_for_each_entry_safe(reg_beacon, btmp, &reg_pending_beacons, list) {
+               list_del(&reg_beacon->list);
+               kfree(reg_beacon);
        }
        spin_unlock_bh(&reg_pending_beacons_lock);
 
-       if (!list_empty(&reg_beacon_list)) {
-               list_for_each_entry_safe(reg_beacon, btmp,
-                                        &reg_beacon_list, list) {
-                       list_del(&reg_beacon->list);
-                       kfree(reg_beacon);
-               }
+       list_for_each_entry_safe(reg_beacon, btmp, &reg_beacon_list, list) {
+               list_del(&reg_beacon->list);
+               kfree(reg_beacon);
        }
 
        /* First restore to the basic regulatory settings */
@@ -2490,30 +2471,21 @@ void /* __init_or_exit */ regulatory_exit(void)
        platform_device_unregister(reg_pdev);
 
        spin_lock_bh(&reg_pending_beacons_lock);
-       if (!list_empty(&reg_pending_beacons)) {
-               list_for_each_entry_safe(reg_beacon, btmp,
-                                        &reg_pending_beacons, list) {
-                       list_del(&reg_beacon->list);
-                       kfree(reg_beacon);
-               }
+       list_for_each_entry_safe(reg_beacon, btmp, &reg_pending_beacons, list) {
+               list_del(&reg_beacon->list);
+               kfree(reg_beacon);
        }
        spin_unlock_bh(&reg_pending_beacons_lock);
 
-       if (!list_empty(&reg_beacon_list)) {
-               list_for_each_entry_safe(reg_beacon, btmp,
-                                        &reg_beacon_list, list) {
-                       list_del(&reg_beacon->list);
-                       kfree(reg_beacon);
-               }
+       list_for_each_entry_safe(reg_beacon, btmp, &reg_beacon_list, list) {
+               list_del(&reg_beacon->list);
+               kfree(reg_beacon);
        }
 
        spin_lock(&reg_requests_lock);
-       if (!list_empty(&reg_requests_list)) {
-               list_for_each_entry_safe(reg_request, tmp,
-                                        &reg_requests_list, list) {
-                       list_del(&reg_request->list);
-                       kfree(reg_request);
-               }
+       list_for_each_entry_safe(reg_request, tmp, &reg_requests_list, list) {
+               list_del(&reg_request->list);
+               kfree(reg_request);
        }
        spin_unlock(&reg_requests_lock);