linux-kernel - Re: [PATCH v2 next] driver core: auxiliary bus: Fix IS_ERR() vs NULL mixup in __devm_auxiliary_device

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Message-ID: <1jtt6fnhiz.fsf@starbuckisacylon.baylibre.com>
Date: Wed, 23 Apr 2025 15:17:56 +0200
From: Jerome Brunet <jbrunet@...libre.com>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,  Dave Ertman
 <david.m.ertman@...el.com>,  Ira Weiny <ira.weiny@...el.com>,  Leon
 Romanovsky <leon@...nel.org>,  "Rafael J. Wysocki" <rafael@...nel.org>,
  Danilo Krummrich <dakr@...nel.org>,  linux-kernel@...r.kernel.org,
  kernel-janitors@...r.kernel.org
Subject: Re: [PATCH v2 next] driver core: auxiliary bus: Fix IS_ERR() vs
 NULL mixup in __devm_auxiliary_device_create()

On Wed 23 Apr 2025 at 13:04, Dan Carpenter <dan.carpenter@...aro.org> wrote:

> This code was originally going to use error pointers but we decided it
> should return NULL instead.  The error pointer code in
> __devm_auxiliary_device_create() was left over from the first version.
> Update it to use NULL.  No callers have been merged yet, so that makes
> this change simple and self contained.
>
> Fixes: eaa0d30216c1 ("driver core: auxiliary bus: add device creation helpers")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>

Thanks !

Reviewed-by: Jerome Brunet <jbrunet@...libre.com>

> ---
> v2: Originally I just updated the check for auxiliary_device_create()
>     failure and returned ERR_PTR(-ENOMEM) but obviously the
>     auxiliary_device_create() and devm_auxiliary_device_create()
>     functions should return the same thing, NULL.
>
>  drivers/base/auxiliary.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/base/auxiliary.c b/drivers/base/auxiliary.c
> index 810b6105a75d..dba7c8e13a53 100644
> --- a/drivers/base/auxiliary.c
> +++ b/drivers/base/auxiliary.c
> @@ -491,13 +491,13 @@ struct auxiliary_device *__devm_auxiliary_device_create(struct device *dev,
>  	int ret;
>  
>  	auxdev = auxiliary_device_create(dev, modname, devname, platform_data, id);
> -	if (IS_ERR(auxdev))
> -		return auxdev;
> +	if (!auxdev)
> +		return NULL;
>  
>  	ret = devm_add_action_or_reset(dev, auxiliary_device_destroy,
>  				       auxdev);
>  	if (ret)
> -		return ERR_PTR(ret);
> +		return NULL;
>  
>  	return auxdev;
>  }

-- 
Jerome