linux-kernel - Re: [PATCH 1/3] mtd: spi-nor: Export SFDP access to sysfs

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Date:   Wed, 28 Apr 2021 08:37:47 -0700
From:   Alexander Williams <awill@...gle.com>
To:     Michael Walle <michael@...le.cc>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Pratyush Yadav <p.yadav@...com>, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] mtd: spi-nor: Export SFDP access to sysfs

On Wed, Apr 28, 2021 at 12:58 AM Michael Walle <michael@...le.cc> wrote:
>
> Hi Alexander,
>
> Am 2021-04-28 07:27, schrieb Alexander Williams:
> > Add the ability to specify a technology-specific attribute_group, and
> > expose the SFDP through spi-nor's private group. This enables user
> > space
> > to have full access to the contents of the SFDP, so all information is
> > available without regard for whether the kernel supports parsing it.
>
> Please see:
> https://lore.kernel.org/linux-mtd/20210318092406.5340-1-michael@walle.cc/

Thanks for the pointer! Sorry I didn't see that patch series already: My search
skills need some work... In any case, there's no good reason for me to duplicate
work.

I should probably comment on that series directly, but I'll note that one thing
I tried to do with the sysfs attributes here was avoid racing with user space.
The uevent is suppressed until all the related files are created in sysfs. See
http://kroah.com/log/blog/2013/06/26/how-to-create-a-sysfs-file-correctly/ for
Greg's explanation of a scenario.

- Alex