linux-kernel - Re: [PATCH] gpio/langwell: re-read the IRQ status register after each iteration

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Message-ID: <CACRpkda7=kaN53yHT0JML_QQZMYKESEPSh0D5D-3m7hHups6kw@mail.gmail.com>
Date:	Fri, 11 May 2012 13:57:42 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Julia Lawall <julia.lawall@...6.fr>
Cc:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	linux-kernel@...r.kernel.org, grant.likely@...retlab.ca,
	linus.walleij@...ricsson.com
Subject: Re: [PATCH] gpio/langwell: re-read the IRQ status register after each iteration

On Thu, May 10, 2012 at 10:34 PM, Julia Lawall <julia.lawall@...6.fr> wrote:

> I tried the following:
>
> @@
> expression pending,gedr,e1;
> statement S;
> @@
>
> *pending = readl(gedr);
> ... when != pending = e1
> while (pending) S
>
> That is, a readl call followed by a while loop with no reassignment of
> pending.
>
> Perhaps the following are suspicious:
>
> arch/arm/mach-msm/dma.c, function msm_datamover_irq_handler
> drivers/gpio/gpio-msm-v1.c, function msm_gpio_irq_handler
>
> But I am not completely sure to understand what is wanted (or not wanted).

No problem, I will look at them.
Thanks Julia!

Yours,
Linus Walleij
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