qcacld-3.0: Prevent CSA in middle of CAC

If precac interface is in the middle of CAC, do not
entertain any CSA request coming as part of userspace/
country change/unsafe channel handling. Processing the
Channel change request in middle of CAC leads to teardown
of the SAP as SAP is in SAP_STOPPED state.
This leads to pre-cac failure.

To fix this, prevent CSA while CAC and once CAC is finished,
check the sanity of the operating channel based on
unsafe/disable channel list and move it to a valid channel.

Change-Id: I2757753a2a13bdaef60f9b9a46fcd569ddb7306c
CRs-Fixed: 3505593

components/cmn_services/policy_mgr/src/wlan_policy_mgr_action.c

@@ -2223,6 +2223,16 @@ void policy_mgr_check_sap_restart(struct wlan_objmgr_psoc *psoc,
 		return;
 	}
 
+	/*
+	 * Restart should be handled by sap_fsm_validate_and_change_channel(),
+	 * after SAP starts.
+	 */
+	if (pm_ctx->hdd_cbacks.hdd_is_cac_in_progress &&
+	    pm_ctx->hdd_cbacks.hdd_is_cac_in_progress()) {
+		policy_mgr_debug("DFS CAC in progress, do not restart SAP");
+		return;
+	}
+
 	if (!pm_ctx->hdd_cbacks.wlan_hdd_get_channel_for_sap_restart) {
 		policy_mgr_err("SAP restart get channel callback in NULL");
 		goto end;