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mac80211: Call drv_set_tim only if there is a change 

It is possible that sta_info_recalc_tim() is called consecutively
without changing the station's tim bit. In such cases there is no
need to call the driver's set_tim() callback.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Ilan Peer 2013-03-05 15:27:20 +02:00 committed by Johannes Berg
parent e943789edb
commit 3d5839b6aa
1 changed files with 13 additions and 0 deletions
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13
net/mac80211/sta_info.c
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@ -556,6 +556,15 @@ static inline void __bss_tim_clear(u8 *tim, u16 id)
tim[id / 8] &= ~(1 << (id % 8));
}
static inline bool __bss_tim_get(u8 *tim, u16 id)
{
/*
* This format has been mandated by the IEEE specifications,
* so this line may not be changed to use the test_bit() format.
*/
return tim[id / 8] & (1 << (id % 8));
}
static unsigned long ieee80211_tids_for_ac(int ac)
{
/* If we ever support TIDs > 7, this obviously needs to be adjusted */
@ -636,6 +645,9 @@ void sta_info_recalc_tim(struct sta_info *sta)
done:
spin_lock_bh(&local->tim_lock);
if (indicate_tim == __bss_tim_get(ps->tim, id))
goto out_unlock;
if (indicate_tim)
__bss_tim_set(ps->tim, id);
else
@ -647,6 +659,7 @@ void sta_info_recalc_tim(struct sta_info *sta)
local->tim_in_locked_section = false;
}
out_unlock:
spin_unlock_bh(&local->tim_lock);
}