linux-kernel - Re: [PATCH v2 10/23] gpio: sysfs: release irq after class-device deregistration

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Date:	Tue, 12 May 2015 10:29:17 +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 10/23] gpio: sysfs: release irq after class-device deregistration

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

> Make sure to release any irq only after the class device has been
> deregistered.
>
> This avoids a race between gpiod_unexport and edge_store, where an irq
> could be allocated just before the gpio class device is deregistered
> without relying on FLAG_EXPORT and the global sysfs lock.
>
> Note that there is no need to hold the sysfs lock when releasing the irq
> after the class device is gone as kernfs will prevent further attribute
> operations.
>
> Signed-off-by: Johan Hovold <johan@...nel.org>

Patch applied.

Yours,
Linus Walleij
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