disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/drivers/firmware/efi/vars.c
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@@ -1,22 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0+
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 /*
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  * Originally from efivars.c
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  *
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  * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com>
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  * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com>
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- *
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- *  This program is free software; you can redistribute it and/or modify
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- *  it under the terms of the GNU General Public License as published by
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- *  the Free Software Foundation; either version 2 of the License, or
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- *  (at your option) any later version.
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- *
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- *  This program is distributed in the hope that it will be useful,
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- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- *  GNU General Public License for more details.
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- *
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- *  You should have received a copy of the GNU General Public License
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- *  along with this program; if not, write to the Free Software
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- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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  */
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8
 
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 #include <linux/capability.h>
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@@ -44,10 +31,6 @@
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  * 3) (un)registration of __efivars
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  */
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 static DEFINE_SEMAPHORE(efivars_lock);
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-
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-static bool efivar_wq_enabled = true;
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-DECLARE_WORK(efivar_work, NULL);
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-EXPORT_SYMBOL_GPL(efivar_work);
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 static bool
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 validate_device_path(efi_char16_t *var_name, int match, u8 *buffer,
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@@ -404,13 +387,6 @@
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 	size_t i, len8 = len16 / sizeof(efi_char16_t);
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 	char *str8;
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389
 
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-	/*
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-	 * Disable the workqueue since the algorithm it uses for
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-	 * detecting new variables won't work with this buggy
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-	 * implementation of GetNextVariableName().
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-	 */
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-	efivar_wq_enabled = false;
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-
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 	str8 = kzalloc(len8, GFP_KERNEL);
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 	if (!str8)
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 		return;
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@@ -427,7 +403,6 @@
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  * efivar_init - build the initial list of EFI variables
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  * @func: callback function to invoke for every variable
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  * @data: function-specific data to pass to @func
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- * @atomic: do we need to execute the @func-loop atomically?
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  * @duplicates: error if we encounter duplicates on @head?
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  * @head: initialised head of variable list
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  *
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@@ -509,6 +484,10 @@
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 				}
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 			}
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+			break;
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+		case EFI_UNSUPPORTED:
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+			err = -EOPNOTSUPP;
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+			status = EFI_NOT_FOUND;
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 			break;
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 		case EFI_NOT_FOUND:
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 			break;
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@@ -763,6 +742,7 @@
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 {
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 	const struct efivar_operations *ops;
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 	efi_status_t status;
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+	unsigned long varsize;
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 	if (!__efivars)
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 		return -EINVAL;
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@@ -785,15 +765,17 @@
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 		return efivar_entry_set_nonblocking(name, vendor, attributes,
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 						    size, data);
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+	varsize = size + ucs2_strsize(name, 1024);
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 	if (!block) {
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 		if (down_trylock(&efivars_lock))
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 			return -EBUSY;
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+		status = check_var_size_nonblocking(attributes, varsize);
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 	} else {
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 		if (down_interruptible(&efivars_lock))
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 			return -EINTR;
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+		status = check_var_size(attributes, varsize);
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 	}
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-	status = check_var_size(attributes, size + ucs2_strsize(name, 1024));
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 	if (status != EFI_SUCCESS) {
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 		up(&efivars_lock);
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 		return -ENOSPC;
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@@ -1084,7 +1066,7 @@
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  * entry on the list. It is safe for @func to remove entries in the
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  * list via efivar_entry_delete().
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  *
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- * You MUST call efivar_enter_iter_begin() before this function, and
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+ * You MUST call efivar_entry_iter_begin() before this function, and
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  * efivar_entry_iter_end() afterwards.
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  *
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  * It is possible to begin iteration from an arbitrary entry within
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@@ -1171,16 +1153,6 @@
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 EXPORT_SYMBOL_GPL(efivars_kobject);
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 /**
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- * efivar_run_worker - schedule the efivar worker thread
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- */
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-void efivar_run_worker(void)
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-{
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-	if (efivar_wq_enabled)
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-		schedule_work(&efivar_work);
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-}
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-EXPORT_SYMBOL_GPL(efivar_run_worker);
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-
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-/**
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  * efivars_register - register an efivars
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  * @efivars: efivars to register
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  * @ops: efivars operations
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@@ -1242,3 +1214,9 @@
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 	return rv;
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 }
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 EXPORT_SYMBOL_GPL(efivars_unregister);
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+
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+int efivar_supports_writes(void)
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+{
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+	return __efivars && __efivars->ops->set_variable;
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+}
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+EXPORT_SYMBOL_GPL(efivar_supports_writes);