linux-kernel - Re: [PATCH 1/2] mtd: mtdconcat: Judge callback function existence getting from master for each partition

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Message-ID: <27c67e42-f275-fc50-64e5-d80233130f7e@huawei.com>
Date:   Sat, 7 Aug 2021 10:15:46 +0800
From:   Zhihao Cheng <chengzhihao1@...wei.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
CC:     <richard@....at>, <vigneshr@...com>, <bbrezillon@...nel.org>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <yukuai3@...wei.com>
Subject: Re: [PATCH 1/2] mtd: mtdconcat: Judge callback function existence
 getting from master for each partition

在 2021/8/7 3:28, Miquel Raynal 写道:
Hi Miquel,
> Hi Zhihao,
>
> Zhihao Cheng <chengzhihao1@...wei.com> wrote on Sat, 31 Jul 2021
> 10:32:42 +0800:
> @@ -721,14 +724,15 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[],	/* subdevices to c
>   				    subdev[i]->flags & MTD_WRITEABLE;
>   		}
>   
> +		subdev_master = mtd_get_master(subdev[i]);
>   		concat->mtd.size += subdev[i]->size;
>   		concat->mtd.ecc_stats.badblocks +=
>   			subdev[i]->ecc_stats.badblocks;
>   		if (concat->mtd.writesize   !=  subdev[i]->writesize ||
>   		    concat->mtd.subpage_sft != subdev[i]->subpage_sft ||
>   		    concat->mtd.oobsize    !=  subdev[i]->oobsize ||
> -		    !concat->mtd._read_oob  != !subdev[i]->_read_oob ||
> -		    !concat->mtd._write_oob != !subdev[i]->_write_oob) {
> +		    !concat->mtd._read_oob  != !subdev_master->_read_oob ||
> +		    !concat->mtd._write_oob != !subdev_master->_write_oob) {
> Do you really need this change?

I think both "!concat->mtd._read_oob != !subdev[i]->_read_oob" and 
"!concat->mtd._write_oob != !subdev[i]->_write_oob" need to be modified 
otherwise concatenating goes failure.

I thought there exists two problems:

   1. Wrong callback fetching in mtd partition device

   2. Warning for existence of _read and _read_oob at the same time

so I solved them in two steps to make history commit logs a bit clear.

Though these two patches can be combined to one.