wl1251: fix elp_work race condition

While working on PS I've noticed elp_work is kicking rather often, and
sometimes the chip is put to sleep before 5ms delay expires. This
seems to happen because by the time wl1251_ps_elp_wakeup is called
elp_work might still be pending. After wakeup is done, the processing
may take some time, during which 5ms might expire and elp_work might
get scheduled. In this case, ss soon as 1st thread finishes work and
releases the mutex, elp_work will then put the device to sleep without
5ms delay. In addition 1st thread will queue additional elp_work
needlessly.

Fix this by cancelling work in wl1251_ps_elp_wakeup instead.

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Acked-by: Kalle Valo <kvalo@adurom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/wl1251/ps.c b/drivers/net/wireless/wl1251/ps.c
index 842155e..9cc5147 100644 (file)
--- a/drivers/net/wireless/wl1251/ps.c
+++ b/drivers/net/wireless/wl1251/ps.c
@@ -58,7 +58,6 @@ void wl1251_ps_elp_sleep(struct wl1251 *wl)
        unsigned long delay;
 
        if (wl->psm) {
-               cancel_delayed_work(&wl->elp_work);
                delay = msecs_to_jiffies(ELP_ENTRY_DELAY);
                ieee80211_queue_delayed_work(wl->hw, &wl->elp_work, delay);
        }
@@ -69,6 +68,9 @@ int wl1251_ps_elp_wakeup(struct wl1251 *wl)
        unsigned long timeout, start;
        u32 elp_reg;
 
+       if (delayed_work_pending(&wl->elp_work))
+               cancel_delayed_work(&wl->elp_work);
+
        if (!wl->elp)
                return 0;