diff options
| author | Zhihao Cheng <chengzhihao1@huawei.com> | 2021-08-17 19:48:57 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-09-22 12:28:03 +0200 |
| commit | b9b89da56af761fbb12da26ca5eb0c068446ec16 (patch) | |
| tree | 4c53c698b95fc882ca990d7357b52aee44cc4d8f /drivers | |
| parent | 812cbb143c12596ad2f2cc289e73a5afe462675f (diff) | |
mtd: mtdconcat: Check _read, _write callbacks existence before assignment
[ Upstream commit a89d69a44e282be95ae76125dddc79515541efeb ]
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 <chengzhihao1@huawei.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20210817114857.2784825-3-chengzhihao1@huawei.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mtd/mtdconcat.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c index af51eee6b5e8..f685a581df48 100644 --- a/drivers/mtd/mtdconcat.c +++ b/drivers/mtd/mtdconcat.c @@ -694,6 +694,10 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to c concat->mtd._block_markbad = concat_block_markbad; if (subdev_master->_panic_write) concat->mtd._panic_write = concat_panic_write; + if (subdev_master->_read) + concat->mtd._read = concat_read; + if (subdev_master->_write) + concat->mtd._write = concat_write; concat->mtd.ecc_stats.badblocks = subdev[0]->ecc_stats.badblocks; @@ -755,8 +759,6 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to c concat->mtd.name = name; concat->mtd._erase = concat_erase; - concat->mtd._read = concat_read; - concat->mtd._write = concat_write; concat->mtd._sync = concat_sync; concat->mtd._lock = concat_lock; concat->mtd._unlock = concat_unlock; |