linux-kernel - Re: [PATCH v2] iio: trigger: Print an error if there is no available irq

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Date:   Wed, 20 Feb 2019 16:56:19 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Mathieu Othacehe <m.othacehe@...il.com>
Cc:     knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] iio: trigger: Print an error if there is no
 available irq

On Wed, 20 Feb 2019 17:49:10 +0100
Mathieu Othacehe <m.othacehe@...il.com> wrote:

> If there are more trigger consumers than
> CONFIG_IIO_CONSUMERS_PER_TRIGGER, iio_trigger_attach_poll_func will
> silently fail. Add an error message to inform the user that
> CONFIG_IIO_CONSUMERS_PER_TRIGGER limit might be exceeded.
> 
> Signed-off-by: Mathieu Othacehe <m.othacehe@...il.com>
Applied to the togreg branch of iio.git and pushed out as
testing for the autobuilders to play with it.

Thanks,

Jonathan

> ---
>  drivers/iio/industrialio-trigger.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/industrialio-trigger.c b/drivers/iio/industrialio-trigger.c
> index ce66699c7fcc..e5b538379ed1 100644
> --- a/drivers/iio/industrialio-trigger.c
> +++ b/drivers/iio/industrialio-trigger.c
> @@ -254,8 +254,11 @@ static int iio_trigger_attach_poll_func(struct iio_trigger *trig,
>  
>  	/* Get irq number */
>  	pf->irq = iio_trigger_get_irq(trig);
> -	if (pf->irq < 0)
> +	if (pf->irq < 0) {
> +		pr_err("Could not find an available irq for trigger %s, CONFIG_IIO_CONSUMERS_PER_TRIGGER=%d limit might be exceeded\n",
> +			trig->name, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
>  		goto out_put_module;
> +	}
>  
>  	/* Request irq */
>  	ret = request_threaded_irq(pf->irq, pf->h, pf->thread,