linux-kernel - Re: [PATCH v2 03/14] iio: sx9310: Fix irq handling

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Date:   Wed, 29 Jul 2020 01:40:59 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Daniel Campello <campello@...omium.org>,
        LKML <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Daniel Campello <campello@...omium.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Douglas Anderson <dianders@...omium.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org
Subject: Re: [PATCH v2 03/14] iio: sx9310: Fix irq handling

Quoting Daniel Campello (2020-07-28 16:05:09)
> Fixes enable/disable irq handling at various points. The driver needs to
> only enable/disable irqs if there is an actual irq handler installed.
> 
> Signed-off-by: Daniel Campello <campello@...omium.org>
> ---
> 
> Changes in v2:
>  - Reordered error handling on sx9310_resume()
> 
>  drivers/iio/proximity/sx9310.c | 26 ++++++++++++++++----------
>  1 file changed, 16 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
> index 07895d4b935d12..108d82ba81146e 100644
> --- a/drivers/iio/proximity/sx9310.c
> +++ b/drivers/iio/proximity/sx9310.c
> @@ -376,13 +376,15 @@ static int sx9310_read_proximity(struct sx9310_data *data,
>         if (ret < 0)
>                 goto out;
>  
> -       ret = sx9310_enable_irq(data, SX9310_CONVDONE_IRQ);
> -       if (ret < 0)
> -               goto out_put_channel;
> +       if (data->client->irq) {
> +               ret = sx9310_enable_irq(data, SX9310_CONVDONE_IRQ);

I still think it makes more sense to push the if condition inside the
enable/disable irq functions so that the call sites read simpler.

> +               if (ret)
> +                       goto out_put_channel;
> +       }
>  
>         mutex_unlock(&data->mutex);
>  
> -       if (data->client->irq > 0) {
> +       if (data->client->irq) {
>                 ret = wait_for_completion_interruptible(&data->completion);
>                 reinit_completion(&data->completion);
>         } else {
> @@ -401,9 +403,11 @@ static int sx9310_read_proximity(struct sx9310_data *data,
>         *val = sign_extend32(be16_to_cpu(rawval),
>                              (chan->address == SX9310_REG_DIFF_MSB ? 11 : 15));
>  
> -       ret = sx9310_disable_irq(data, SX9310_CONVDONE_IRQ);
> -       if (ret < 0)
> -               goto out_put_channel;
> +       if (data->client->irq) {
> +               ret = sx9310_disable_irq(data, SX9310_CONVDONE_IRQ);
> +               if (ret)
> +                       goto out_put_channel;
> +       }
>  
>         ret = sx9310_put_read_channel(data, chan->channel);
>         if (ret < 0)
> @@ -414,7 +418,8 @@ static int sx9310_read_proximity(struct sx9310_data *data,
>         return IIO_VAL_INT;
>  
>  out_disable_irq:
> -       sx9310_disable_irq(data, SX9310_CONVDONE_IRQ);
> +       if (data->client->irq)
> +               sx9310_disable_irq(data, SX9310_CONVDONE_IRQ);

And so this isn't duplicated check.

>  out_put_channel:
>         sx9310_put_read_channel(data, chan->channel);
>  out: