linux-kernel - Re: [PATCH 4/4] UBI: Implement bitrot checking

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Date:	Wed, 08 Apr 2015 23:02:23 +0200
From:	Andrea Scian <rnd4@...e-tech.it>
To:	Richard Weinberger <richard@....at>
CC:	linux-mtd@...ts.infradead.org, boris.brezillon@...e-electrons.com,
	linux-kernel@...r.kernel.org, dedekind1@...il.com
Subject: Re: [PATCH 4/4] UBI: Implement bitrot checking

Il 08/04/2015 12:34, Richard Weinberger ha scritto:
> Am 02.04.2015 um 21:19 schrieb Andrea Scian:
>> Il 02/04/2015 19:54, Richard Weinberger ha scritto:
>>> Hi!
>>>
>>> Am 02.04.2015 um 19:34 schrieb Andrea Scian:
>>>> Richard,
>>>>
>>>> Il 29/03/2015 14:13, Richard Weinberger ha scritto:
>>>>> +	mutex_lock(&ubi->buf_mutex);
>>>>> +	err = ubi_io_read(ubi, ubi->peb_buf, e->pnum, 0, ubi->peb_size);
>>>>> +	mutex_unlock(&ubi->buf_mutex);
>>>>> +	if (err == UBI_IO_BITFLIPS) {
>>>>> +		dbg_wl("found bitflips in PEB %d", e->pnum);
>>>>> +		spin_lock(&ubi->wl_lock);
>>>>> +
>>>> IIUC you trigger the action as soon as you have a bitflip error, is this
>>>> correct?
>>> I trigger it as soon UBI sees the bitflip. This depends on the configured MTD
>>> bitflip_threshold.
>>
>> ops.. I confused UBI bitflip error with MTD bitflip error ;-)
>> thanks for point this out and help me understanding the code
>>
>> now it's clear and it sounds good to me
> 
> Is this an implicit Reviewed-by? :)

Yes

Reviewed-by: Andrea Scian <andrea.scian@...e.eu>

(I have lot to learn about submitting kernel patches ;-) )

Unfortunately I cannot review it from a deep technical point of view
because some part of bitrot_check_worker() are not so clear to me (I'm
not an UBI expert and I need to dig a little bit further to have better
understanding), but the idea IMHO is right and it's worth having into UBI

Kind Regards,

-- 

Andrea SCIAN

DAVE Embedded Systems
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