qcacld-3.0: Flush psoc idle work during WIFI on/off

Currently in the driver there is a possible race condition between
hdd_open and idle_psoc_timeout wherein stop modules is being done. Both
these operations can potentially occur in parallel.

To synchronize, flush the idle_psoc_work in wlan_hdd_state_ctrl_param_write
which is called during WiFi ON/OFF.

Change-Id: I1d53fa9d53ca31c2c1466f0ee809a07a86a06ee0
CRs-Fixed: 2701512

core/hdd/src/wlan_hdd_main.c

@@ -14764,6 +14764,7 @@ static ssize_t wlan_hdd_state_ctrl_param_write(struct file *filp,
 	static const char wlan_on_str[] = "ON";
 	int ret;
 	unsigned long rc;
+	struct hdd_context *hdd_ctx = cds_get_context(QDF_MODULE_ID_HDD);
 
 	if (copy_from_user(buf, user_buf, 3)) {
 		pr_err("Failed to read buffer\n");
@@ -14794,6 +14795,13 @@ static ssize_t wlan_hdd_state_ctrl_param_write(struct file *filp,
 		}
 	}
 
+	/*
+	 * Flush idle shutdown work for cases to synchronize the wifi on
+	 * during the idle shutdown.
+	 */
+	if (hdd_ctx)
+		hdd_psoc_idle_timer_stop(hdd_ctx);
+
 exit:
 	return count;
 }