staging: wfx: firmware never return PS status for stations

At the beginning, firmware could send suspend_resume indication to
notify that a station wake up or sleep down. However, mac80211 already
handles power save status of stations and this behavior has been removed
from the firmware. So now, when suspend_resume indication is received,
it is always to notify that a DTIM is about to be sent.

So, it is possible to simply wfx_suspend_resume().
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200115135338.14374-56-Jerome.Pouiller@silabs.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/sta.c

@@ -985,20 +985,16 @@ int wfx_ampdu_action(struct ieee80211_hw *hw,
 	return -ENOTSUPP;
 }
 
-static void wfx_dtim_notify(struct wfx_vif *wvif)
-{
-	spin_lock_bh(&wvif->ps_state_lock);
-	wvif->sta_asleep_mask = 0;
-	wfx_bh_request_tx(wvif->wdev);
-	spin_unlock_bh(&wvif->ps_state_lock);
-}
-
 void wfx_suspend_resume(struct wfx_vif *wvif,
 			const struct hif_ind_suspend_resume_tx *arg)
 {
-	if (arg->suspend_resume_flags.bc_mc_only) {
 	bool cancel_tmo = false;
 
+	if (!arg->suspend_resume_flags.bc_mc_only) {
+		dev_warn(wvif->wdev->dev, "unsupported suspend/resume notification\n");
+		return;
+	}
+
 	spin_lock_bh(&wvif->ps_state_lock);
 	if (!arg->suspend_resume_flags.resume)
 		wvif->mcast_tx = false;
@@ -1012,11 +1008,6 @@ void wfx_suspend_resume(struct wfx_vif *wvif,
 	spin_unlock_bh(&wvif->ps_state_lock);
 	if (cancel_tmo)
 		del_timer_sync(&wvif->mcast_timeout);
-	} else if (arg->suspend_resume_flags.resume) {
-		wfx_dtim_notify(wvif);
-	} else {
-		dev_warn(wvif->wdev->dev, "unsupported suspend/resume notification\n");
-	}
 }
 
 int wfx_add_chanctx(struct ieee80211_hw *hw,