linux-kernel - Re: [PATCH] mtd: spi-nor: Prefer asynchronous probe

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Message-ID: <23aa87ccb6ae4133a17885b809194161@walle.cc>
Date:   Sun, 04 Oct 2020 16:10:46 +0200
From:   Michael Walle <michael@...le.cc>
To:     Doug Anderson <dianders@...omium.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, linux-mtd@...ts.infradead.org,
        miquel.raynal@...tlin.com, richard@....at,
        tudor.ambarus@...rochip.com, vigneshr@...com
Subject: Re: [PATCH] mtd: spi-nor: Prefer asynchronous probe

Hi,

Am 2020-10-03 19:00, schrieb Doug Anderson:
> On Sat, Oct 3, 2020 at 9:54 AM Michael Walle <michael@...le.cc> wrote:
>> While debugging another issue I also noticed that sometimes my
>> /dev/mtdN devices were reordered. Note that I have two SPI flashes.
>> Might this also be connected to the async probe?
> 
> It's likely.  My guess is that you shouldn't really be depending on
> the numbering.  If you need to depend on the numbering, there should
> be something that guarantees it like a device tree alias.  We have
> struggled with similar things on MMC for years and I guess Ulf finally
> decided that we weren't going to get a better solution than the device
> tree aliases.

But this has to be supported by spi-nor first, right? So that would also
be something which has to be added before we can make the probe async.
And as far as I know there is no such mechanism like /dev/disk/by-X for
/dev/mtdN.

-michael