linux-kernel - Re: [PATCH 1/1] [media] ite-cir: postpone ISR registration

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Message-ID: <20120419150813.GA22948@zeus>
Date:	Thu, 19 Apr 2012 16:08:13 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>
Cc:	Jarod Wilson <jarod@...hat.com>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/1] [media] ite-cir: postpone ISR registration

On Wed, Apr 18, 2012 at 09:54:07PM +0100, Luis Henriques wrote:
> An early registration of an ISR was causing a crash to several users (for
> example here: http://bugs.launchpad.net/bugs/972723  The reason was that
> IRQs were being triggered before the driver initialisation was completed.
> 
> This patch fixes this by moving the invocation to request_irq() to a later
> stage on the driver probe function.
> 
> Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
> ---
>  drivers/media/rc/ite-cir.c |    8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/media/rc/ite-cir.c b/drivers/media/rc/ite-cir.c
> index 682009d..98d8ccf 100644
> --- a/drivers/media/rc/ite-cir.c
> +++ b/drivers/media/rc/ite-cir.c
> @@ -1521,10 +1521,6 @@ static int ite_probe(struct pnp_dev *pdev, const struct pnp_device_id
>  				dev_desc->io_region_size, ITE_DRIVER_NAME))
>  		goto failure;
>  
> -	if (request_irq(itdev->cir_irq, ite_cir_isr, IRQF_SHARED,
> -			ITE_DRIVER_NAME, (void *)itdev))
> -		goto failure;
> -
>  	/* set driver data into the pnp device */
>  	pnp_set_drvdata(pdev, itdev);
>  	itdev->pdev = pdev;
> @@ -1600,6 +1596,10 @@ static int ite_probe(struct pnp_dev *pdev, const struct pnp_device_id
>  	rdev->driver_name = ITE_DRIVER_NAME;
>  	rdev->map_name = RC_MAP_RC6_MCE;
>  
> +	if (request_irq(itdev->cir_irq, ite_cir_isr, IRQF_SHARED,
> +			ITE_DRIVER_NAME, (void *)itdev))
> +		goto failure;
> +
>  	ret = rc_register_device(rdev);
>  	if (ret)
>  		goto failure;
> -- 
> 1.7.9.5

I completely forgot to add:

Cc: <stable@...r.kernel.org>

to my email.

Cheers,
--
Luis
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