linux-kernel - Re: [RESEND PATCH] mtd: spi-nor: core: Check written SR value in spi_nor_write_16bit_sr_and

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Date:   Wed, 27 Apr 2022 07:14:09 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <p.yadav@...com>, <chentsung@...omium.org>
CC:     <michael@...le.cc>, <miquel.raynal@...tlin.com>, <richard@....at>,
        <vigneshr@...com>, <linux-kernel@...r.kernel.org>,
        <linux-mtd@...ts.infradead.org>
Subject: Re: [RESEND PATCH] mtd: spi-nor: core: Check written SR value in
 spi_nor_write_16bit_sr_and_check()

On 4/27/22 10:11, Tudor Ambarus wrote:
> On 1/31/22 19:19, Pratyush Yadav wrote:
>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>>
>> On 26/01/22 03:32PM, Chen-Tsung Hsieh wrote:
>>> Read back Status Register 1 to ensure that the written byte match the
>>> received value and return -EIO if read back test failed.
>>>
>>> Without this patch, spi_nor_write_16bit_sr_and_check() only check the
>>> second half of the 16bit. It causes errors like spi_nor_sr_unlock()
>>> return success incorrectly when spi_nor_write_16bit_sr_and_check()
>>> doesn't write SR successfully.
>>>

cc to stable please

>>> Fixes: 39d1e3340c73 ("mtd: spi-nor: Fix clearing of QE bit on lock()/unlock()")
>>> Signed-off-by: Chen-Tsung Hsieh <chentsung@...omium.org>
>>
>> I don't know much about this bit of code but this patch looks fine to me
>> from the surface. Would be nice to hear from Tudor about this too since
>> he added the function.
> 
> Reviewed-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
>>
>> Acked-by: Pratyush Yadav <p.yadav@...com>