mac80211: remove IEEE80211_HW_SCAN_WHILE_IDLE

There are only a few drivers that use HW scan, and
all of those don't need a non-idle transition before
starting the scan -- some don't even care about idle
at all. Remove the flag and code associated with it.

The only driver that really actually needed this is
wl1251 and it can just do it itself in the hw_scan
callback -- implement that.
Acked-by: Luciano Coelho <coelho@ti.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/iwlwifi/dvm/mac80211.c

@@ -151,8 +151,7 @@ int iwlagn_mac_setup_register(struct iwl_priv *priv,
 		    IEEE80211_HW_QUEUE_CONTROL |
 		    IEEE80211_HW_SUPPORTS_PS |
 		    IEEE80211_HW_SUPPORTS_DYNAMIC_PS |
-		    IEEE80211_HW_WANT_MONITOR_VIF |
-		    IEEE80211_HW_SCAN_WHILE_IDLE;
+		    IEEE80211_HW_WANT_MONITOR_VIF;
 
 	hw->offchannel_tx_hw_queue = IWL_AUX_QUEUE;
 	hw->radiotap_mcs_details |= IEEE80211_RADIOTAP_MCS_HAVE_FMT;

drivers/net/wireless/iwlwifi/mvm/mac80211.c

@@ -113,7 +113,6 @@ int iwl_mvm_mac_setup_register(struct iwl_mvm *mvm)
 		    IEEE80211_HW_REPORTS_TX_ACK_STATUS |
 		    IEEE80211_HW_QUEUE_CONTROL |
 		    IEEE80211_HW_WANT_MONITOR_VIF |
-		    IEEE80211_HW_SCAN_WHILE_IDLE |
 		    IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC |
 		    IEEE80211_HW_SUPPORTS_PS |
 		    IEEE80211_HW_SUPPORTS_DYNAMIC_PS |

drivers/net/wireless/ti/wl1251/event.c

@@ -29,6 +29,8 @@
 static int wl1251_event_scan_complete(struct wl1251 *wl,
 				      struct event_mailbox *mbox)
 {
+	int ret = 0;
+
 	wl1251_debug(DEBUG_EVENT, "status: 0x%x, channels: %d",
 		     mbox->scheduled_scan_status,
 		     mbox->scheduled_scan_channels);
@@ -37,9 +39,11 @@ static int wl1251_event_scan_complete(struct wl1251 *wl,
 		ieee80211_scan_completed(wl->hw, false);
 		wl1251_debug(DEBUG_MAC80211, "mac80211 hw scan completed");
 		wl->scanning = false;
+		if (wl->hw->conf.flags & IEEE80211_CONF_IDLE)
+			ret = wl1251_ps_set_mode(wl, STATION_IDLE);
 	}
 
-	return 0;
+	return ret;
 }
 
 static void wl1251_event_mbox_dump(struct event_mailbox *mbox)

drivers/net/wireless/ti/wl1251/main.c

@@ -623,7 +623,7 @@ static int wl1251_op_config(struct ieee80211_hw *hw, u32 changed)
 		}
 	}
 
-	if (changed & IEEE80211_CONF_CHANGE_IDLE) {
+	if (changed & IEEE80211_CONF_CHANGE_IDLE && !wl->scanning) {
 		if (conf->flags & IEEE80211_CONF_IDLE) {
 			ret = wl1251_ps_set_mode(wl, STATION_IDLE);
 			if (ret < 0)
@@ -895,11 +895,21 @@ static int wl1251_op_hw_scan(struct ieee80211_hw *hw,
 	if (ret < 0)
 		goto out;
 
+	if (hw->conf.flags & IEEE80211_CONF_IDLE) {
+		ret = wl1251_ps_set_mode(wl, STATION_ACTIVE_MODE);
+		if (ret < 0)
+			goto out_sleep;
+		ret = wl1251_join(wl, wl->bss_type, wl->channel,
+				  wl->beacon_int, wl->dtim_period);
+		if (ret < 0)
+			goto out_sleep;
+	}
+
 	skb = ieee80211_probereq_get(wl->hw, wl->vif, ssid, ssid_len,
 				     req->ie_len);
 	if (!skb) {
 		ret = -ENOMEM;
-		goto out;
+		goto out_idle;
 	}
 	if (req->ie_len)
 		memcpy(skb_put(skb, req->ie_len), req->ie, req->ie_len);
@@ -908,11 +918,11 @@ static int wl1251_op_hw_scan(struct ieee80211_hw *hw,
 				      skb->len);
 	dev_kfree_skb(skb);
 	if (ret < 0)
-		goto out_sleep;
+		goto out_idle;
 
 	ret = wl1251_cmd_trigger_scan_to(wl, 0);
 	if (ret < 0)
-		goto out_sleep;
+		goto out_idle;
 
 	wl->scanning = true;
 
@@ -920,9 +930,13 @@ static int wl1251_op_hw_scan(struct ieee80211_hw *hw,
 			      req->n_channels, WL1251_SCAN_NUM_PROBES);
 	if (ret < 0) {
 		wl->scanning = false;
-		goto out_sleep;
+		goto out_idle;
 	}
+	goto out_sleep;
 
+out_idle:
+	if (hw->conf.flags & IEEE80211_CONF_IDLE)
+		ret = wl1251_ps_set_mode(wl, STATION_IDLE);
 out_sleep:
 	wl1251_ps_elp_sleep(wl);
 

drivers/net/wireless/ti/wlcore/main.c

@@ -5636,7 +5636,6 @@ static int wl1271_init_ieee80211(struct wl1271 *wl)
 		IEEE80211_HW_AP_LINK_PS |
 		IEEE80211_HW_AMPDU_AGGREGATION |
 		IEEE80211_HW_TX_AMPDU_SETUP_IN_HW |
-		IEEE80211_HW_SCAN_WHILE_IDLE |
 		IEEE80211_HW_QUEUE_CONTROL;
 
 	wl->hw->wiphy->cipher_suites = cipher_suites;

include/net/mac80211.h

@@ -1363,10 +1363,6 @@ struct ieee80211_tx_control {
  *	setup strictly in HW. mac80211 should not attempt to do this in
  *	software.
  *
- * @IEEE80211_HW_SCAN_WHILE_IDLE: The device can do hw scan while
- *	being idle (i.e. mac80211 doesn't have to go idle-off during the
- *	the scan).
- *
  * @IEEE80211_HW_WANT_MONITOR_VIF: The driver would like to be informed of
  *	a virtual monitor interface when monitor interfaces are the only
  *	active interfaces.
@@ -1408,7 +1404,6 @@ enum ieee80211_hw_flags {
 	IEEE80211_HW_SUPPORTS_PER_STA_GTK		= 1<<21,
 	IEEE80211_HW_AP_LINK_PS				= 1<<22,
 	IEEE80211_HW_TX_AMPDU_SETUP_IN_HW		= 1<<23,
-	IEEE80211_HW_SCAN_WHILE_IDLE			= 1<<24,
 	IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF		= 1<<25,
 	IEEE80211_HW_TIMING_BEACON_ONLY			= 1<<26,
 };

net/mac80211/debugfs.c

@@ -151,8 +151,6 @@ static ssize_t hwflags_read(struct file *file, char __user *user_buf,
 		sf += snprintf(buf + sf, mxln - sf, "AP_LINK_PS\n");
 	if (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)
 		sf += snprintf(buf + sf, mxln - sf, "TX_AMPDU_SETUP_IN_HW\n");
-	if (local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)
-		sf += snprintf(buf + sf, mxln - sf, "SCAN_WHILE_IDLE\n");
 
 	rv = simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
 	kfree(buf);

net/mac80211/iface.c

@@ -151,12 +151,8 @@ static u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
 		}
 	}
 
-	sdata = rcu_dereference_protected(local->scan_sdata,
-					  lockdep_is_held(&local->mtx));
-	if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
-		scanning = true;
-		sdata->vif.bss_conf.idle = false;
-	}
+	scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
+		   test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 
 	list_for_each_entry(sdata, &local->interfaces, list) {
 		if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||

net/mac80211/main.c

@@ -696,9 +696,6 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
 		return -EINVAL;
 #endif
 
-	if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
-		return -EINVAL;
-
 	if (!local->use_chanctx) {
 		for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 			const struct ieee80211_iface_combination *comb;