Revert "add toggle for disabling newly added USB devices"

This has been replaced by the dwc3 usb_data_enabled toggle.

This reverts commit feba940cfd.

Change-Id: Iccef7773009b72b69058af363eb2035d73469aac

drivers/usb/core/hub.c

@@ -37,8 +37,6 @@
 #define USB_VENDOR_GENESYS_LOGIC		0x05e3
 #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND	0x01
 
-extern int deny_new_usb;
-
 /* Protect struct usb_device->state and ->children members
  * Note: Both are also protected by ->dev.sem, except that ->state can
  * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
@@ -4929,12 +4927,6 @@ static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus,
 			goto done;
 		return;
 	}
-
-	if (deny_new_usb) {
-		dev_err(&port_dev->dev, "denied insert of USB device on port %d\n", port1);
-		goto done;
-	}
-
 	if (hub_is_superspeed(hub->hdev))
 		unit_load = 150;
 	else

kernel/sysctl.c

@@ -98,10 +98,6 @@
 #if defined(CONFIG_SYSCTL)
 
 /* External variables not in a header file. */
-#ifdef CONFIG_USB
-int deny_new_usb __read_mostly = 0;
-EXPORT_SYMBOL(deny_new_usb);
-#endif
 extern int suid_dumpable;
 #ifdef CONFIG_COREDUMP
 extern int core_uses_pid;
@@ -1007,17 +1003,6 @@ static struct ctl_table kern_table[] = {
 		.extra1		= &zero,
 		.extra2		= &two,
 	},
-#endif
-#ifdef CONFIG_USB
-	{
-		.procname	= "deny_new_usb",
-		.data		= &deny_new_usb,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec_minmax_sysadmin,
-		.extra1		= &zero,
-		.extra2		= &one,
-	},
 #endif
 	{
 		.procname	= "ngroups_max",