linux-kernel - Re: [PATCH v2 1/2] spi: spidev: fix a race condition when accessing spidev->spi

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Message-ID: <Y7hJbjnbcxZnh/9M@sirena.org.uk>
Date:   Fri, 6 Jan 2023 16:16:46 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v2 1/2] spi: spidev: fix a race condition when accessing
 spidev->spi

On Fri, Jan 06, 2023 at 03:27:57PM +0100, Bartosz Golaszewski wrote:

> IMO the complication of using an RW semaphore is insignificant and
> maybe a comment next to its declaration in struct spidev would
> suffice?

The complication is using a semaphore at all, it's a pretty unusual
locking construct and the whole up/down thing isn't clear to people
who aren't familiar with it.  Given that there's no clounting being
used rwlock would be a much more obvious choice if the microseconds
of extra concurrency is meaningful somehow.

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