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>

9 files changed, 27 insertions, 26 deletions

diff --git a/drivers/net/wireless/iwlwifi/dvm/mac80211.c b/drivers/net/wireless/iwlwifi/dvm/mac80211.c
index 75f6f6cfdd4..0fccf725a2e 100644
--- a/drivers/net/wireless/iwlwifi/dvm/mac80211.c
+++ b/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;
diff --git a/drivers/net/wireless/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/iwlwifi/mvm/mac80211.c
index ce6127caabd..bbb8a5b3566 100644
--- a/drivers/net/wireless/iwlwifi/mvm/mac80211.c
+++ b/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 |
diff --git a/drivers/net/wireless/ti/wl1251/event.c b/drivers/net/wireless/ti/wl1251/event.c
index 5ec50a476a6..74ae8e1c2e3 100644
--- a/drivers/net/wireless/ti/wl1251/event.c
+++ b/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)
diff --git a/drivers/net/wireless/ti/wl1251/main.c b/drivers/net/wireless/ti/wl1251/main.c
index f47e8b0482a..bbbf68cf50a 100644
--- a/drivers/net/wireless/ti/wl1251/main.c
+++ b/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);
 
diff --git a/drivers/net/wireless/ti/wlcore/main.c b/drivers/net/wireless/ti/wlcore/main.c
index 28a37576d56..2c2ff3e1f84 100644
--- a/drivers/net/wireless/ti/wlcore/main.c
+++ b/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;
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 8d25769b325..86ad2c34152 100644
--- a/include/net/mac80211.h
+++ b/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,
 };
diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index 8e6040998ba..b0e32d62811 100644
--- a/net/mac80211/debugfs.c
+++ b/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);
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index deb78e864af..3ece8eb6d2d 100644
--- a/net/mac80211/iface.c
+++ b/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 ||
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 2220331f4b7..38b3468bc51 100644
--- a/net/mac80211/main.c
+++ b/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;