qcacld-3.0: Remove the reboot notification to notification

This commit reverts 830c969fc9fe07f80af094d670e798f57c0cc03d.
The changes are taken care at the upper layer to not invoke
the driver unload during the system reboot.

Hence reverting the change which added the reboot notification
to driver

Change-Id: I9582fd4b7db158756a2f558a65a79c3f733e97a0
CRs-Fixed: 2443790

core/hdd/src/wlan_hdd_main.c

@@ -78,7 +78,6 @@
 #include <linux/semaphore.h>
 #include <linux/ctype.h>
 #include <linux/compat.h>
-#include <linux/reboot.h>
 #include <linux/ethtool.h>
 
 #ifdef WLAN_FEATURE_DP_BUS_BANDWIDTH
@@ -193,7 +192,6 @@
 #define PANIC_ON_BUG_STR ""
 #endif
 
-bool g_is_system_reboot_triggered;
 int wlan_start_ret_val;
 static DECLARE_COMPLETION(wlan_start_comp);
 static unsigned int dev_num = 1;
@@ -324,7 +322,6 @@ static const struct category_info cinfo[MAX_SUPPORTED_CATEGORY] = {
 };
 
 struct notifier_block hdd_netdev_notifier;
-struct notifier_block system_reboot_notifier;
 
 struct sock *cesium_nl_srv_sock;
 #ifdef FEATURE_WLAN_AUTO_SHUTDOWN
@@ -862,27 +859,6 @@ struct notifier_block hdd_netdev_notifier = {
 	.notifier_call = hdd_netdev_notifier_call,
 };
 
-static int system_reboot_notifier_call(struct notifier_block *nb,
-				       unsigned long msg_type, void *_unused)
-{
-	switch (msg_type) {
-	case SYS_DOWN:
-	case SYS_HALT:
-	case SYS_POWER_OFF:
-		g_is_system_reboot_triggered = true;
-		hdd_info("reboot, reason: %ld", msg_type);
-		break;
-	default:
-		break;
-	}
-
-	return NOTIFY_OK;
-}
-
-struct notifier_block system_reboot_notifier = {
-	.notifier_call = system_reboot_notifier_call,
-};
-
 /* variable to hold the insmod parameters */
 static int con_mode;
 
@@ -7478,7 +7454,6 @@ void hdd_wlan_exit(struct hdd_context *hdd_ctx)
 		hdd_deinit_all_adapters(hdd_ctx, false);
 	}
 
-	unregister_reboot_notifier(&system_reboot_notifier);
 	unregister_netdevice_notifier(&hdd_netdev_notifier);
 
 	qdf_dp_trace_deinit();
@@ -11883,19 +11858,13 @@ int hdd_wlan_startup(struct hdd_context *hdd_ctx)
 		goto unregister_wiphy;
 	}
 
-	errno = register_reboot_notifier(&system_reboot_notifier);
-	if (errno) {
-		hdd_err("Failed to register reboot notifier; errno:%d", errno);
-		goto unregister_netdev;
-	}
-
 	wlan_hdd_update_11n_mode(hdd_ctx);
 
 	hdd_lpass_notify_wlan_version(hdd_ctx);
 
 	errno = hdd_register_notifiers(hdd_ctx);
 	if (errno)
-		goto unregister_reboot;
+		goto unregister_netdev;
 
 	status = wlansap_global_init();
 	if (QDF_IS_STATUS_ERROR(status))
@@ -11912,9 +11881,6 @@ int hdd_wlan_startup(struct hdd_context *hdd_ctx)
 unregister_notifiers:
 	hdd_unregister_notifiers(hdd_ctx);
 
-unregister_reboot:
-	unregister_reboot_notifier(&system_reboot_notifier);
-
 unregister_netdev:
 	unregister_netdevice_notifier(&hdd_netdev_notifier);
 
@@ -13738,11 +13704,6 @@ static void hdd_driver_unload(void)
 	pr_info("%s: Unloading driver v%s\n", WLAN_MODULE_NAME,
 		QWLAN_VERSIONSTR);
 
-	if (g_is_system_reboot_triggered) {
-		hdd_info("System rebooting; Skipping unload");
-		return;
-	}
-
 	if (hdd_ctx)
 		hdd_psoc_idle_timer_stop(hdd_ctx);