linux-kernel - Re: [PATCH v5 1/5] GPIO: pca953x.c: Fix IRQ support.

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Date:	Thu, 16 Jun 2011 13:45:23 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	David Jander <david@...tonic.nl>
Cc:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/5] GPIO: pca953x.c: Fix IRQ support.

On Tue, Jun 14, 2011 at 11:00:54AM +0200, David Jander wrote:
> It seems that in the normal case, IRQ_NOREQUEST needs to be explicitly
> cleared, otherwise claiming the interrupt fails.
> In the case of sparse interrupts, the descriptor needs to be allocated
> first.
> 
> Signed-off-by: David Jander <david@...tonic.nl>

Merged, thanks.

g.

> ---
>  drivers/gpio/pca953x.c |   10 ++++++++--
>  1 files changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpio/pca953x.c b/drivers/gpio/pca953x.c
> index 0451d7a..5f6940a 100644
> --- a/drivers/gpio/pca953x.c
> +++ b/drivers/gpio/pca953x.c
> @@ -474,12 +474,16 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
>  		 * this purpose.
>  		 */
>  		chip->irq_stat &= chip->reg_direction;
> -		chip->irq_base = pdata->irq_base;
>  		mutex_init(&chip->irq_lock);
>  
> +		chip->irq_base = irq_alloc_descs(-1, pdata->irq_base, chip->gpio_chip.ngpio, -1);
> +		if (chip->irq_base < 0)
> +			goto out_failed;
> +
>  		for (lvl = 0; lvl < chip->gpio_chip.ngpio; lvl++) {
>  			int irq = lvl + chip->irq_base;
>  
> +			irq_clear_status_flags(irq, IRQ_NOREQUEST);
>  			irq_set_chip_data(irq, chip);
>  			irq_set_chip_and_handler(irq, &pca953x_irq_chip,
>  						 handle_simple_irq);
> @@ -514,8 +518,10 @@ out_failed:
>  
>  static void pca953x_irq_teardown(struct pca953x_chip *chip)
>  {
> -	if (chip->irq_base != -1)
> +	if (chip->irq_base != -1) {
> +		irq_free_descs(chip->irq_base, chip->gpio_chip.ngpio);
>  		free_irq(chip->client->irq, chip);
> +	}
>  }
>  #else /* CONFIG_GPIO_PCA953X_IRQ */
>  static int pca953x_irq_setup(struct pca953x_chip *chip,
> -- 
> 1.7.4.1
> 
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