linux-kernel - Re: [PATCH 6/7] mfd: twl4030-irq: set irq nested flag

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Date:	Mon, 12 Dec 2011 19:58:31 +0200
From:	Felipe Contreras <felipe.contreras@...il.com>
To:	Felipe Balbi <balbi@...com>
Cc:	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Tony Lindgren <tony@...mide.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 6/7] mfd: twl4030-irq: set irq nested flag

On Thu, Jun 30, 2011 at 12:51 PM, Felipe Balbi <balbi@...com> wrote:
> threads from twl4030's children will be called
> nested in the context of the demultiplexing
> handler on twl4030-irq.c.
>
> Signed-off-by: Felipe Balbi <balbi@...com>
> ---
>  drivers/mfd/twl4030-irq.c |   11 ++++++-----
>  1 files changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/mfd/twl4030-irq.c b/drivers/mfd/twl4030-irq.c
> index 1b9ab2f..ff16e9c 100644
> --- a/drivers/mfd/twl4030-irq.c
> +++ b/drivers/mfd/twl4030-irq.c
> @@ -304,7 +304,7 @@ static irqreturn_t handle_twl4030_pih(int irq, void *devid)
>                        pih_isr;
>                        pih_isr >>= 1, module_irq++) {
>                if (pih_isr & 0x1)
> -                       generic_handle_irq(module_irq);
> +                       handle_nested_irq(module_irq);

But handle_nested_irq calls action->thread_fn, which is NULL for the
sih handlers that are set-up below; handle_twl4030_sih will never be
called.

>        }
>
>        return IRQ_HANDLED;
> @@ -596,9 +596,7 @@ static void handle_twl4030_sih(unsigned irq, struct irq_desc *desc)
>        int isr;
>
>        /* reading ISR acks the IRQs, using clear-on-read mode */
> -       local_irq_enable();
>        isr = sih_read_isr(sih);
> -       local_irq_disable();

But handle_twl4030_sih is still not nested.

Fortunately, Neil Brown already fixed the issues in this patch by
making handle_twl4030_sih truly nested:
http://article.gmane.org/gmane.linux.kernel/1220708

Cheers.

-- 
Felipe Contreras
--
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