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From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Zhihao Cheng <chengzhihao1@huawei.com>
Cc: <richard@nod.at>, <vigneshr@ti.com>, <bbrezillon@kernel.org>,
	<linux-mtd@lists.infradead.org>, <linux-kernel@vger.kernel.org>,
	<yukuai3@huawei.com>
Subject: Re: [PATCH 2/2] mtd: mtdconcat: Remove concat_{read|write}_oob
Date: Sat, 7 Aug 2021 12:28:14 +0200	[thread overview]
Message-ID: <20210807122814.109ec082@xps13> (raw)
In-Reply-To: <83cb21c4-0140-40d5-e0f8-7f2a7e781a5f@huawei.com>

Hi Zhihao,

Zhihao Cheng <chengzhihao1@huawei.com> wrote on Sat, 7 Aug 2021
10:59:32 +0800:

> 在 2021/8/7 3:26, Miquel Raynal 写道:
> Hi Miquel,
> >>   static int concat_erase(struct mtd_info *mtd, struct erase_info *instr)
> >>   {
> >>   	struct mtd_concat *concat = CONCAT(mtd);
> >> @@ -684,10 +580,6 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[],	/* subdevices to c
> >>   	subdev_master = mtd_get_master(subdev[0]);
> >>   	if (subdev_master->_writev)
> >>   		concat->mtd._writev = concat_writev;
> >> -	if (subdev_master->_read_oob)
> >> -		concat->mtd._read_oob = concat_read_oob;
> >> -	if (subdev_master->_write_oob)
> >> -		concat->mtd._write_oob = concat_write_oob;  
> > Actually I am not sure _read|write_oob() is the right callback to
> > remove.
> >
> > Richard, what is your input on this? Shall we remove _read|write()
> > instead? I don't remember the exact rationale behind these two helpers.  
> 
> Oh, I guess I made a mistake. It looks like that reserving _{read|write}_oob is a better method in my limited knowledge to nand driver. For example, nand_do_read_oob() behaves different from nand_do_read_ops(), and calling which function is decided by mtd_oob_ops.databuf.
> Callback _read_oobs() can support both functions, but callback _read() don't support nand_do_read_oob(). So mtd_read_oobs() covers mtd_read()?
> Is my understand right?
> 

Yes please let's drop _read|write() instead.

Thanks,
Miquèl

______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

WARNING: multiple messages have this Message-ID (diff)
From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Zhihao Cheng <chengzhihao1@huawei.com>
Cc: <richard@nod.at>, <vigneshr@ti.com>, <bbrezillon@kernel.org>,
	<linux-mtd@lists.infradead.org>, <linux-kernel@vger.kernel.org>,
	<yukuai3@huawei.com>
Subject: Re: [PATCH 2/2] mtd: mtdconcat: Remove concat_{read|write}_oob
Date: Sat, 7 Aug 2021 12:28:14 +0200	[thread overview]
Message-ID: <20210807122814.109ec082@xps13> (raw)
In-Reply-To: <83cb21c4-0140-40d5-e0f8-7f2a7e781a5f@huawei.com>

Hi Zhihao,

Zhihao Cheng <chengzhihao1@huawei.com> wrote on Sat, 7 Aug 2021
10:59:32 +0800:

> 在 2021/8/7 3:26, Miquel Raynal 写道:
> Hi Miquel,
> >>   static int concat_erase(struct mtd_info *mtd, struct erase_info *instr)
> >>   {
> >>   	struct mtd_concat *concat = CONCAT(mtd);
> >> @@ -684,10 +580,6 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[],	/* subdevices to c
> >>   	subdev_master = mtd_get_master(subdev[0]);
> >>   	if (subdev_master->_writev)
> >>   		concat->mtd._writev = concat_writev;
> >> -	if (subdev_master->_read_oob)
> >> -		concat->mtd._read_oob = concat_read_oob;
> >> -	if (subdev_master->_write_oob)
> >> -		concat->mtd._write_oob = concat_write_oob;  
> > Actually I am not sure _read|write_oob() is the right callback to
> > remove.
> >
> > Richard, what is your input on this? Shall we remove _read|write()
> > instead? I don't remember the exact rationale behind these two helpers.  
> 
> Oh, I guess I made a mistake. It looks like that reserving _{read|write}_oob is a better method in my limited knowledge to nand driver. For example, nand_do_read_oob() behaves different from nand_do_read_ops(), and calling which function is decided by mtd_oob_ops.databuf.
> Callback _read_oobs() can support both functions, but callback _read() don't support nand_do_read_oob(). So mtd_read_oobs() covers mtd_read()?
> Is my understand right?
> 

Yes please let's drop _read|write() instead.

Thanks,
Miquèl

  reply	other threads:[~2021-08-07 10:29 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-31  2:32 [PATCH 0/2] mtd: mtdconcat: Fix callback functions check Zhihao Cheng
2021-07-31  2:32 ` Zhihao Cheng
2021-07-31  2:32 ` [PATCH 1/2] mtd: mtdconcat: Judge callback function existence getting from master for each partition Zhihao Cheng
2021-07-31  2:32   ` Zhihao Cheng
2021-08-06 19:28   ` Miquel Raynal
2021-08-06 19:28     ` Miquel Raynal
2021-08-07  2:15     ` Zhihao Cheng
2021-08-07  2:15       ` Zhihao Cheng
2021-08-07 10:32       ` Miquel Raynal
2021-08-07 10:32         ` Miquel Raynal
2021-08-10 11:35         ` Zhihao Cheng
2021-08-10 11:35           ` Zhihao Cheng
2021-08-16 13:43           ` Miquel Raynal
2021-08-16 13:43             ` Miquel Raynal
2021-08-16 14:27   ` Miquel Raynal
2021-08-16 14:27     ` Miquel Raynal
2021-07-31  2:32 ` [PATCH 2/2] mtd: mtdconcat: Remove concat_{read|write}_oob Zhihao Cheng
2021-07-31  2:32   ` Zhihao Cheng
2021-08-06 19:26   ` Miquel Raynal
2021-08-06 19:26     ` Miquel Raynal
2021-08-07  2:59     ` Zhihao Cheng
2021-08-07  2:59       ` Zhihao Cheng
2021-08-07 10:28       ` Miquel Raynal [this message]
2021-08-07 10:28         ` Miquel Raynal
2021-08-16 14:27   ` Miquel Raynal
2021-08-16 14:27     ` Miquel Raynal

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