From 3d5839b6aa6bbf26c04e885956109d1995d01fe2 Mon Sep 17 00:00:00 2001 From: Ilan Peer Date: Tue, 5 Mar 2013 15:27:20 +0200 Subject: [PATCH] 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 Signed-off-by: Johannes Berg --- net/mac80211/sta_info.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c index 852bf45fcfa3..a36ceedf53b3 100644 --- a/net/mac80211/sta_info.c +++ b/net/mac80211/sta_info.c @@ -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); }