qcacld-3.0: Initialize the acs pending work in do acs

Scenario:-
Two ACS request come in parallel, for two SAP startup
The driver started with one ACS, and scheduled the
other after the first one is complete,driver sets
a bit in flag of adapter that is
test_bit(ACS_PENDING, &adapter->event_flags)
and then schedule work when the ACS channel is
selected in the API wlan_hdd_cfg80211_acs_ch_select_evt.

After this driver got delete interface for the second
interface and as part of it in hdd stop adapter
driver checks that if the flag of pending ACS is set,
flush the pending ACS work, and reset the flag.

But the work is yet to be initialized, which would be done
as part of wlan_hdd_cfg80211_acs_ch_select_evt
and it is not yet completed as the first ACS is busy with the
ACS scan, and the scan callback and channel selection logic
is still yet to be done.

Fix is to initialize the work when the driver detects that
first ACS is in progress, and it needs to wait for the
first one to complete.

Change-Id: If706528f1afd6075144bff40611e82742df76368
CRs-Fixed: 2559703

core/hdd/src/wlan_hdd_cfg80211.c

@@ -3140,6 +3140,8 @@ static int __wlan_hdd_cfg80211_do_acs(struct wiphy *wiphy,
 		 * Since this CFG80211 call lock rtnl mutex, we cannot hold on
 		 * for this long. So we split up the scanning part.
 		 */
+		INIT_DELAYED_WORK(&adapter->acs_pending_work,
+				  wlan_hdd_cfg80211_start_pending_acs);
 		set_bit(ACS_PENDING, &adapter->event_flags);
 		hdd_debug("ACS Pending for %s", adapter->dev->name);
 		ret = 0;
@@ -3472,8 +3474,6 @@ void wlan_hdd_cfg80211_acs_ch_select_evt(struct hdd_adapter *adapter)
 	con_sap_adapter = hdd_get_con_sap_adapter(adapter, false);
 	if (con_sap_adapter &&
 		test_bit(ACS_PENDING, &con_sap_adapter->event_flags)) {
-		INIT_DELAYED_WORK(&con_sap_adapter->acs_pending_work,
-				      wlan_hdd_cfg80211_start_pending_acs);
 		/* Lets give 1500ms for OBSS + START_BSS to complete */
 		schedule_delayed_work(&con_sap_adapter->acs_pending_work,
 					msecs_to_jiffies(1500));