linux-kernel - Re: [PATCH] iio: Fix return value check for set_trigger

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Date:   Sat, 15 Jul 2023 18:29:19 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Waqar Hameed <waqar.hameed@...s.com>
Cc:     Lars-Peter Clausen <lars@...afoo.de>, <kernel@...s.com>,
        <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iio: Fix return value check for set_trigger_state()

On Thu, 13 Jul 2023 12:47:31 +0200
Waqar Hameed <waqar.hameed@...s.com> wrote:

> In `iio_trigger_detach_poll_func()` the return value from
> `trig->ops->set_trigger_state(trig, false)` is checked with `if (ret)`.
> However, in `iio_trigger_attach_poll_func()` it is checked with
> `if (ret < 0)`. Fix this mismatch by only checking for `if (ret)` in
> both places.

I wouldn't have used fix in the title unless you have a case where this
causes problems (so a driver returns > 0 for this callback).

I have no problem with it as a consistency improvement but I don't
really want to see it backported (which will happen with fix in the
title ;)

I'll tweak that and with that done, applied to the togreg branch
of iio.git and pushed out initially as testing to let 0-day see if
it can find anything we missed.

Thanks,

Jonathan


> 
> Signed-off-by: Waqar Hameed <waqar.hameed@...s.com>
> ---
>  drivers/iio/industrialio-trigger.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/industrialio-trigger.c b/drivers/iio/industrialio-trigger.c
> index f207e36b12cc..18f83158f637 100644
> --- a/drivers/iio/industrialio-trigger.c
> +++ b/drivers/iio/industrialio-trigger.c
> @@ -313,7 +313,7 @@ int iio_trigger_attach_poll_func(struct iio_trigger *trig,
>  	/* Enable trigger in driver */
>  	if (trig->ops && trig->ops->set_trigger_state && notinuse) {
>  		ret = trig->ops->set_trigger_state(trig, true);
> -		if (ret < 0)
> +		if (ret)
>  			goto out_free_irq;
>  	}
>