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mac80211: only alloc mem if a station doesn't exist yet

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This speeds up the function in case a station already exists by avoiding
calling an expensive kzalloc just to free it again after the next check.

Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Koen Vandeputte 2016-12-14 17:28:59 +01:00 committed by Johannes Berg
parent 445cd452fe
commit 0c2e384267
1 changed files with 7 additions and 7 deletions
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14
net/mac80211/sta_info.c
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@ -513,23 +513,23 @@ static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
{
struct ieee80211_local *local = sta->local;
struct ieee80211_sub_if_data *sdata = sta->sdata;
struct station_info *sinfo;
struct station_info *sinfo = NULL;
int err = 0;
lockdep_assert_held(&local->sta_mtx);
sinfo = kzalloc(sizeof(struct station_info), GFP_KERNEL);
if (!sinfo) {
err = -ENOMEM;
goto out_err;
}
/* check if STA exists already */
if (sta_info_get_bss(sdata, sta->sta.addr)) {
err = -EEXIST;
goto out_err;
}
sinfo = kzalloc(sizeof(struct station_info), GFP_KERNEL);
if (!sinfo) {
err = -ENOMEM;
goto out_err;
}
local->num_sta++;
local->sta_generation++;
smp_mb();