linux-kernel - Re: [PATCH v2 20/23] gpio: sysfs: fix race between gpiod export and unexport

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Message-ID: <CACRpkdbqu178r9fp8SjVOv=QkdxBDBbRhymN_YJr-rErGn8ZBw@mail.gmail.com>
Date:	Tue, 12 May 2015 10:42:49 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Johan Hovold <johan@...nel.org>
Cc:	Alexandre Courbot <gnurou@...il.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 20/23] gpio: sysfs: fix race between gpiod export and unexport

On Mon, May 4, 2015 at 5:10 PM, Johan Hovold <johan@...nel.org> wrote:

> Make sure to deregister the class device (and release the irq) while
> holding the sysfs lock in gpio_unexport to prevent racing with
> gpio_export.
>
> Note that this requires the recently introduced per-gpio locking to
> avoid a deadlock with the kernfs active protection when waiting for the
> attribute operations to drain during deregistration.
>
> Signed-off-by: Johan Hovold <johan@...nel.org>

Patch applied.

Yours,
Linus Walleij
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