add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/mtd/mtdchar.c
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@@ -1,20 +1,6 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
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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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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- *
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  */
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 #include <linux/device.h>
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@@ -188,7 +174,7 @@
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 			break;
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 		case MTD_FILE_MODE_RAW:
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 		{
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-			struct mtd_oob_ops ops;
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+			struct mtd_oob_ops ops = {};
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 			ops.mode = MTD_OPS_RAW;
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 			ops.datbuf = kbuf;
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@@ -282,7 +268,7 @@
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 		case MTD_FILE_MODE_RAW:
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 		{
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-			struct mtd_oob_ops ops;
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+			struct mtd_oob_ops ops = {};
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 			ops.mode = MTD_OPS_RAW;
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 			ops.datbuf = kbuf;
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@@ -363,15 +349,16 @@
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 	uint64_t start, uint32_t length, void __user *ptr,
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 	uint32_t __user *retp)
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 {
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+	struct mtd_info *master  = mtd_get_master(mtd);
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 	struct mtd_file_info *mfi = file->private_data;
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-	struct mtd_oob_ops ops;
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+	struct mtd_oob_ops ops = {};
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 	uint32_t retlen;
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 	int ret = 0;
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 	if (length > 4096)
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 		return -EINVAL;
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-	if (!mtd->_write_oob)
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+	if (!master->_write_oob)
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 		return -EOPNOTSUPP;
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 	ops.ooblen = length;
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@@ -405,7 +392,7 @@
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 	uint32_t __user *retp)
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 {
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 	struct mtd_file_info *mfi = file->private_data;
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-	struct mtd_oob_ops ops;
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+	struct mtd_oob_ops ops = {};
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 	int ret = 0;
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 	if (length > 4096)
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@@ -597,8 +584,9 @@
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 static int mtdchar_write_ioctl(struct mtd_info *mtd,
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 		struct mtd_write_req __user *argp)
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 {
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+	struct mtd_info *master = mtd_get_master(mtd);
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 	struct mtd_write_req req;
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-	struct mtd_oob_ops ops;
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+	struct mtd_oob_ops ops = {};
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 	const void __user *usr_data, *usr_oob;
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 	int ret;
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@@ -608,9 +596,8 @@
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 	usr_data = (const void __user *)(uintptr_t)req.usr_data;
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 	usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
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-	if (!mtd->_write_oob)
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+	if (!master->_write_oob)
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 		return -EOPNOTSUPP;
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-
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 	ops.mode = req.mode;
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 	ops.len = (size_t)req.len;
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 	ops.ooblen = (size_t)req.ooblen;
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@@ -646,6 +633,7 @@
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 {
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 	struct mtd_file_info *mfi = file->private_data;
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 	struct mtd_info *mtd = mfi->mtd;
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+	struct mtd_info *master = mtd_get_master(mtd);
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 	void __user *argp = (void __user *)arg;
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 	int ret = 0;
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 	struct mtd_info_user info;
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@@ -874,7 +862,7 @@
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 	{
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 		struct nand_oobinfo oi;
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-		if (!mtd->ooblayout)
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+		if (!master->ooblayout)
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 			return -EOPNOTSUPP;
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 		ret = get_oobinfo(mtd, &oi);
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@@ -968,7 +956,7 @@
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 	{
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 		struct nand_ecclayout_user *usrlay;
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-		if (!mtd->ooblayout)
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+		if (!master->ooblayout)
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 			return -EOPNOTSUPP;
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 		usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);