kernel/linux.git/drivers/mtd/mtdconcat.c, branch v6.12.80

mtd: concat: Use kmemdup_array instead of kmemdup for multiple allocation

2024-08-23T17:25:51+00:00

When we are allocating an array, using kmemdup_array() to take care about multiplication and possible overflows. Also it makes auditing the code easier. Signed-off-by: Yan Zhen Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20240823110824.3895787-1-yanzhen@vivo.com

mtd: fix repeated word in comment

2022-09-20T08:40:30+00:00

Delete the redundant word 'in'. Signed-off-by: wangjianli Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20220908122229.10814-1-wangjianli@cdjrlc.com

mtd: mtdconcat: Check _read, _write callbacks existence before assignment

2021-08-17T16:43:33+00:00

Since 2431c4f5b46c3 ("mtd: Implement mtd_{read,write}() as wrappers around mtd_{read,write}_oob()") don't allow _write|_read and _write_oob|_read_oob existing at the same time, we should check the existence of callbacks "_read and _write" from subdev's master device (We can trust master device since it has been registered) before assigning, otherwise following warning occurs while making concatenated device: WARNING: CPU: 2 PID: 6728 at drivers/mtd/mtdcore.c:595 add_mtd_device+0x7f/0x7b0 Fixes: 2431c4f5b46c3 ("mtd: Implement mtd_{read,write}() around ...") Signed-off-by: Zhihao Cheng Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20210817114857.2784825-3-chengzhihao1@huawei.com

mtd: mtdconcat: Judge callback existence based on the master

2021-08-17T16:43:30+00:00

Since commit 46b5889cc2c5("mtd: implement proper partition handling") applied, mtd partition device won't hold some callback functions, such as _block_isbad, _block_markbad, etc. Besides, function mtd_block_isbad() will get mtd device's master mtd device, then invokes master mtd device's callback function. So, following process may result mtd_block_isbad() always return 0, even though mtd device has bad blocks: 1. Split a mtd device into 3 partitions: PA, PB, PC [ Each mtd partition device won't has callback function _block_isbad(). ] 2. Concatenate PA and PB as a new mtd device PN [ mtd_concat_create() finds out each subdev has no callback function _block_isbad(), so PN won't be assigned callback function concat_block_isbad(). ] Then, mtd_block_isbad() checks "!master->_block_isbad" is true, will always return 0. Reproducer: // reproduce.c static int __init init_diy_module(void) { struct mtd_info *mtd[2]; struct mtd_info *mtd_combine = NULL; mtd[0] = get_mtd_device_nm("NAND simulator partition 0"); if (!mtd[0]) { pr_err("cannot find mtd1\n"); return -EINVAL; } mtd[1] = get_mtd_device_nm("NAND simulator partition 1"); if (!mtd[1]) { pr_err("cannot find mtd2\n"); return -EINVAL; } put_mtd_device(mtd[0]); put_mtd_device(mtd[1]); mtd_combine = mtd_concat_create(mtd, 2, "Combine mtd"); if (mtd_combine == NULL) { pr_err("combine failed\n"); return -EINVAL; } mtd_device_register(mtd_combine, NULL, 0); pr_info("Combine success\n"); return 0; } 1. ID="0x20,0xac,0x00,0x15" 2. modprobe nandsim id_bytes=$ID parts=50,100 badblocks=100 3. insmod reproduce.ko 4. flash_erase /dev/mtd3 0 0 libmtd: error!: MEMERASE64 ioctl failed for eraseblock 100 (mtd3) error 5 (Input/output error) // Should be "flash_erase: Skipping bad block at 00c80000" Fixes: 46b5889cc2c54bac ("mtd: implement proper partition handling") Signed-off-by: Zhihao Cheng Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20210817114857.2784825-2-chengzhihao1@huawei.com

mtd: mtdconcat: map: remove redundant assignment to variable 'size'

2020-09-11T16:49:34+00:00

Variable 'size' is being assigned the value zero that will never be read. The assignment is redundant and can be removed. Addresses-Coverity: ("Unused value") Signed-off-by: Colin Ian King Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20200910154451.752569-1-colin.king@canonical.com

mtd: mtdconcat: map through panic write handler

2020-09-02T07:12:52+00:00

Allows a mtdconcat's subdevice->_panic_write to be used for capturing a mtdoops dump. Note: The ->_panic_write is mapped through from the first chip that is part of the concat virtual device. Signed-off-by: Matthew Weber [miquel.raynal@bootlin.com: return err, not void] Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20200602143403.13465-1-matthew.weber@rockwellcollins.com

mtd: concat: Fix a comment referring to an unknown symbol

2020-01-27T16:45:31+00:00

Fix the comment describing what the mtd_concat_destroy() function does. It referrers to the concat_mtd_devs symbol which has never existed (at least not since the beginning of the Git era). Signed-off-by: Miquel Raynal

mtd: concat: implement _is_locked mtd operation

2019-07-07T18:39:16+00:00

Add an implementation of the _is_locked operation for concatenated mtd devices. This doesn't handle getting the lock status of a range that spans chips, which is consistent with cfi_ppb_is_locked and cfi_intelext_is_locked which only look at the first block in the range. Signed-off-by: Chris Packham Signed-off-by: Richard Weinberger

mtd: concat: refactor concat_lock/concat_unlock

2019-07-07T18:39:16+00:00

concat_lock() and concat_unlock() only differed in terms of the mtd_xx operation they called. Refactor them to use a common helper function and pass a boolean flag to indicate whether lock or unlock is needed. Signed-off-by: Chris Packham Signed-off-by: Richard Weinberger

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 102

2019-05-24T15:39:00+00:00

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 51 franklin st fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 50 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Kate Stewart Reviewed-by: Allison Randal Reviewed-by: Richard Fontana Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190523091649.499889647@linutronix.de Signed-off-by: Greg Kroah-Hartman