linux-kernel - Re: [PATCH 0/2] Fix double counting of S/W ECC engines' ECC stat

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Date:   Thu, 13 May 2021 10:11:02 +0800
From:   ycllin@...c.com.tw
To:     "Miquel Raynal" <miquel.raynal@...tlin.com>
Cc:     juliensu@...c.com.tw, linux-kernel@...r.kernel.org,
        linux-mtd@...ts.infradead.org, richard@....at, vigneshr@...com
Subject: Re: [PATCH 0/2] Fix double counting of S/W ECC engines' ECC stat

> "Miquel Raynal" <miquel.raynal@...tlin.com> 
<deleted>
> 
> Good catch!
> 
> However I don't think the current fix is valid because these engines
> are meant to be used by the raw NAND core as well, I propose something
> like the below, can you please tell me if it works as expected? (not
> even build tested)
> 
> Thanks,
> Miquèl
> 
> 
<deleted>

Thanks for your work.

I tested the two patches(yours and mine) separately in our environment: 
1) MXIC NFC(&raw NAND),2) MXIC SPI host(&SPI-NAND) with S/W BCH engine. 
Both patches are valid(using nandtest/nandbiterrs, values of ecc_stats are 
normal).

This seems to be because the function(nand_ecc_sw_bch_finish_io_req() 
in ecc-sw-bch.c) that would increase the ecc_stats counter is not used 
in the raw NAND world. Am I misunderstanding or is it platform dependency?

BTW, I think your modification should be more in line with the design 
spirit 
of generic ECC engine framework.

Thanks,
YouChing

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