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mac80211: avoid unnecessary beacon deref on CSA counter update 

The beacon struct is already available in many contexts that
are also already in an RCU read-locked section. Avoid that by
using the existing beacon struct pointer directly.

Signed-off-by: Wojciech Dubowik <Wojciech.Dubowik@neratec.com>
[rewrite subject/add commit message]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Wojciech Dubowik 2015-06-10 13:06:53 +02:00 committed by Johannes Berg
parent 1365770248
commit e996ec2a4d
1 changed files with 14 additions and 8 deletions
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22
net/mac80211/tx.c
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@ -3210,6 +3210,16 @@ static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
rcu_read_unlock();
}
static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
{
beacon->csa_current_counter--;
/* the counter should never reach 0 */
WARN_ON_ONCE(!beacon->csa_current_counter);
return beacon->csa_current_counter;
}
u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
@ -3228,11 +3238,7 @@ u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
if (!beacon)
goto unlock;
beacon->csa_current_counter--;
/* the counter should never reach 0 */
WARN_ON_ONCE(!beacon->csa_current_counter);
count = beacon->csa_current_counter;
count = __ieee80211_csa_update_counter(beacon);
unlock:
rcu_read_unlock();
@ -3332,7 +3338,7 @@ __ieee80211_beacon_get(struct ieee80211_hw *hw,
if (beacon) {
if (beacon->csa_counter_offsets[0]) {
if (!is_template)
ieee80211_csa_update_counter(vif);
__ieee80211_csa_update_counter(beacon);
ieee80211_set_csa(sdata, beacon);
}
@ -3378,7 +3384,7 @@ __ieee80211_beacon_get(struct ieee80211_hw *hw,
if (beacon->csa_counter_offsets[0]) {
if (!is_template)
ieee80211_csa_update_counter(vif);
__ieee80211_csa_update_counter(beacon);
ieee80211_set_csa(sdata, beacon);
}
@ -3408,7 +3414,7 @@ __ieee80211_beacon_get(struct ieee80211_hw *hw,
* for now we leave it consistent with overall
* mac80211's behavior.
*/
ieee80211_csa_update_counter(vif);
__ieee80211_csa_update_counter(beacon);
ieee80211_set_csa(sdata, beacon);
}