staging: brcm80211: added locks in wl_mac80211.c

Increasing robustness of the code, although no problem has been reported
in the field. Several code paths were unshielded for multi thread access.
Several lock acquisitions have been added to wl_mac80211.c
Signed-off-by: Roland Vossen <rvossen@broadcom.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Reviewed-by: Brett Rudley <brudley@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/brcm80211/brcmsmac/wl_mac80211.c

@@ -172,7 +172,9 @@ static int wl_ops_start(struct ieee80211_hw *hw)
 	*/
 
 	ieee80211_wake_queues(hw);
+	WL_LOCK(wl);
 	blocked = wl_rfkill_set_hw_state(wl);
+	WL_UNLOCK(wl);
 	if (!blocked)
 		wiphy_rfkill_stop_polling(wl->pub->ieee_hw->wiphy);
 
@@ -351,7 +353,9 @@ wl_ops_bss_info_changed(struct ieee80211_hw *hw,
 			val = 1;
 		else
 			val = 0;
+		WL_LOCK(wl);
 		wlc_set(wl->wlc, WLC_SET_SHORTSLOT_OVERRIDE, val);
+		WL_UNLOCK(wl);
 	}
 
 	if (changed & BSS_CHANGED_HT) {
@@ -380,8 +384,10 @@ wl_ops_bss_info_changed(struct ieee80211_hw *hw,
 		/* BSSID changed, for whatever reason (IBSS and managed mode) */
 		WL_NONE("%s: new BSSID: aid %d  bss:%pM\n", __func__,
 			info->aid, info->bssid);
+		WL_LOCK(wl);
 		wlc_set_addrmatch(wl->wlc, RCM_BSSID_OFFSET,
 				  info->bssid);
+		WL_UNLOCK(wl);
 	}
 	if (changed & BSS_CHANGED_BEACON) {
 		/* Beacon data changed, retrieve new beacon (beaconing modes) */
@@ -609,6 +615,7 @@ wl_ops_ampdu_action(struct ieee80211_hw *hw,
 	struct scb *scb = (struct scb *)sta->drv_priv;
 #endif
 	struct wl_info *wl = hw->priv;
+	int status;
 
 	ASSERT(scb->magic == SCB_MAGIC);
 	switch (action) {
@@ -619,7 +626,10 @@ wl_ops_ampdu_action(struct ieee80211_hw *hw,
 		WL_NONE("%s: action = IEEE80211_AMPDU_RX_STOP\n", __func__);
 		break;
 	case IEEE80211_AMPDU_TX_START:
-		if (!wlc_aggregatable(wl->wlc, tid)) {
+		WL_LOCK(wl);
+		status = wlc_aggregatable(wl->wlc, tid);
+		WL_UNLOCK(wl);
+		if (!status) {
 			/* WL_ERROR("START: tid %d is not agg' able, return FAILURE to stack\n", tid); */
 			return -1;
 		}
@@ -1215,6 +1225,7 @@ static void wl_remove(struct pci_dev *pdev)
 {
 	struct wl_info *wl;
 	struct ieee80211_hw *hw;
+	int status;
 
 	hw = pci_get_drvdata(pdev);
 	wl = HW_TO_WL(hw);
@@ -1223,7 +1234,10 @@ static void wl_remove(struct pci_dev *pdev)
 		return;
 	}
 
-	if (!wlc_chipmatch(pdev->vendor, pdev->device)) {
+	WL_LOCK(wl);
+	status = wlc_chipmatch(pdev->vendor, pdev->device);
+	WL_UNLOCK(wl);
+	if (!status) {
 		WL_ERROR("wl: wl_remove: wlc_chipmatch failed\n");
 		return;
 	}