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authorGrazvydas Ignotas <notasas@gmail.com>2011-03-06 19:23:37 +0200
committerJohn W. Linville <linville@tuxdriver.com>2011-03-11 14:15:35 -0500
commit5f6722ee63a45d4ad3412743d161ec54d6c32ccc (patch)
tree4eb2812a5f0dd9c6d538d74f48afee91bca06d90 /drivers/net/wireless/wl1251
parentd0c331aff99ca75f9aa0f794cf68b572d8ec7c5a (diff)
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>
Diffstat (limited to 'drivers/net/wireless/wl1251')
-rw-r--r--drivers/net/wireless/wl1251/ps.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/net/wireless/wl1251/ps.c b/drivers/net/wireless/wl1251/ps.c
index 842155e65a8..9cc514703d2 100644
--- 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;