linux-kernel - Re: [PATCH] spi: Unlock a spinlock before calling into the controller driver.

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Date:	Tue, 26 Jun 2012 03:01:58 +0800
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Bryan Freed <bfreed@...omium.org>
Cc:	spi-devel-general@...ts.sourceforge.net, grant.likely@...retlab.ca,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] spi: Unlock a spinlock before calling into the controller driver.

On Sat, Jun 23, 2012 at 7:53 AM, Bryan Freed <bfreed@...omium.org> wrote:

> spi_pump_messages() calls into a controller driver with
> unprepare_transfer_hardware() which is documented as "This may sleep".
> As in the prepare_transfer_hardware() call below, we should release the
> queue_lock spinlock before making the call.
> Rework the logic a bit to hold queue_lock to protect the 'busy' flag,
> then release it to call unprepare_transfer_hardware().
>
> Signed-off-by: Bryan Freed <bfreed@...omium.org>

Yes, this looks correct to me! Good catch.
Acked-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij
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