From: Chaitanya T K <chaitanya.m...@gmail.com>
If we receive suspend after TX path has executed
dynamic ps disable work, the driver will be in
ACTIVE state during suspend and even after it
resumes.
As before suspend all data packets are flushed
it is safe to put the driver in to sleep for
optimal power during suspend or up on resume.
Signed-off-by: Chaitanya T K <chaitanya.m...@gmail.com>
---
net/mac80211/pm.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/net/mac80211/pm.c b/net/mac80211/pm.c
index ac6ad62..c9d71c2 100644
--- a/net/mac80211/pm.c
+++ b/net/mac80211/pm.c
@@ -76,6 +76,21 @@ int __ieee80211_suspend(struct ieee80211_hw *hw, struct
cfg80211_wowlan *wowlan)
if (sdata->vif.type != NL80211_IFTYPE_STATION)
continue;
ieee80211_mgd_quiesce(sdata);
+ /* This is to handle a race where suspend
+ * is invoked after dynamic ps work disables
+ * power save due to TX. This causes the driver
+ * to be stuck in ACTIVE during suspend and
+ * after resume unless there is another TX,
+ * after which the dynamic ps puts driver
+ * back to DOZE.
+ */
+ if (sdata->u.mgd.associated &&
+ sdata->u.mgd.powersave &&
+ !(local->hw.conf.flags & IEEE80211_CONF_PS)) {
+ local->hw.conf.flags |= IEEE80211_CONF_PS;
+ ieee80211_hw_config(local,
+ IEEE80211_CONF_CHANGE_PS);
+ }
}
err = drv_suspend(local, wowlan);
--
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