linux-kernel - Re: [PATCH] counter: 104-quad-8: Return error when invalid mode during ceiling

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Message-ID: <CACG_h5o9gK45k3fNUFLMoDi+i5PAMWJssvfXR-pnj=fyCBjQtA@mail.gmail.com>
Date:   Sun, 20 Jun 2021 21:08:03 +0530
From:   Syed Nayyar Waris <syednwaris@...il.com>
To:     William Breathitt Gray <vilhelm.gray@...il.com>
Cc:     Jonathan Cameron <jic23@...nel.org>, linux-iio@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] counter: 104-quad-8: Return error when invalid mode
 during ceiling_write

On Thu, Jun 10, 2021 at 6:59 AM William Breathitt Gray
<vilhelm.gray@...il.com> wrote:
>
> The 104-QUAD-8 only has two count modes where a ceiling value makes
> sense: Range Limit and Modulo-N. Outside of these two modes, setting a
> ceiling value is an invalid operation -- so let's report it as such by
> returning -EINVAL.
>
> Fixes: fc069262261c ("counter: 104-quad-8: Add lock guards - generic interface")
> Cc: Syed Nayyar Waris <syednwaris@...il.com>
> Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
> ---
>  drivers/counter/104-quad-8.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c
> index 09a9a77cce06..81f9642777fb 100644
> --- a/drivers/counter/104-quad-8.c
> +++ b/drivers/counter/104-quad-8.c
> @@ -715,12 +715,13 @@ static ssize_t quad8_count_ceiling_write(struct counter_device *counter,
>         case 1:
>         case 3:
>                 quad8_preset_register_set(priv, count->id, ceiling);
> -               break;
> +               mutex_unlock(&priv->lock);
> +               return len;
>         }
>
>         mutex_unlock(&priv->lock);
>
> -       return len;
> +       return -EINVAL;
>  }
>
>  static ssize_t quad8_count_preset_enable_read(struct counter_device *counter,
> --
> 2.32.0
>

Acked-by: Syed Nayyar Waris <syednwaris@...il.com>

Thanks