linux-kernel - Re: [PATCH v2] UIO: uio_pdrv_genirq: allow custom irq

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Date:	Thu, 30 Oct 2008 00:13:16 +0100
From:	"Hans J. Koch" <hjk@...utronix.de>
To:	Mike Frysinger <vapier@...too.org>
Cc:	hjk@...utronix.de, gregkh@...e.de, damm@...l.co.jp,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] UIO: uio_pdrv_genirq: allow custom irq_flags

On Wed, Oct 29, 2008 at 06:35:52PM -0400, Mike Frysinger wrote:
> I can't think of a reason why the driver prevents people from setting any
> custom bits in their platform device, but I can think of some reasons for
> allowing custom flags.  Like setting the IRQF_TRIGGER_... bits.

We wanted to prevent users from setting IRQF_SHARED in their platform
code, because uio_pdrv_genirq.c explicitly relies on an interrupt not
being shared. This code explicitly checks for IRQF_SHARED and lets
uio_pdrv_genirq_probe() fail if it's set. This allows users to set other
IRQF_* flags. That's an improvement and looks alright to me.

> 
> Signed-off-by: Mike Frysinger <vapier@...too.org>

Signed-off-by: Hans J. Koch <hjk@...utronix.de>

> ---
> v2
> 	- disallow IRQF_SHARED in irq_flags
> 
>  drivers/uio/uio_pdrv_genirq.c |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/uio/uio_pdrv_genirq.c b/drivers/uio/uio_pdrv_genirq.c
> index 1f82c83..3f06818 100644
> --- a/drivers/uio/uio_pdrv_genirq.c
> +++ b/drivers/uio/uio_pdrv_genirq.c
> @@ -81,7 +81,8 @@ static int uio_pdrv_genirq_probe(struct platform_device *pdev)
>  		goto bad0;
>  	}
>  
> -	if (uioinfo->handler || uioinfo->irqcontrol || uioinfo->irq_flags) {
> +	if (uioinfo->handler || uioinfo->irqcontrol ||
> +	    uioinfo->irq_flags & IRQF_SHARED) {
>  		dev_err(&pdev->dev, "interrupt configuration error\n");
>  		goto bad0;
>  	}
> @@ -132,7 +133,7 @@ static int uio_pdrv_genirq_probe(struct platform_device *pdev)
>  	 * Interrupt sharing is not supported.
>  	 */
>  
> -	uioinfo->irq_flags = IRQF_DISABLED;
> +	uioinfo->irq_flags |= IRQF_DISABLED;
>  	uioinfo->handler = uio_pdrv_genirq_handler;
>  	uioinfo->irqcontrol = uio_pdrv_genirq_irqcontrol;
>  	uioinfo->priv = priv;
> -- 
> 1.6.0.2
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