linux-kernel - Re: [PATCH] platform/mellanox: mlxreg-lc: fix error code in mlxreg_lc_create_static

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Message-ID: <20211110223147.GA16388@T470>
Date:   Wed, 10 Nov 2021 14:31:47 -0800
From:   Mark Gross <markgross@...nel.org>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Vadim Pasternak <vadimp@...dia.com>,
        Mark Gross <markgross@...nel.org>,
        Michael Shych <michaelsh@...dia.com>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] platform/mellanox: mlxreg-lc: fix error code in
 mlxreg_lc_create_static_devices()

On Wed, Nov 10, 2021 at 10:43:46AM +0300, Dan Carpenter wrote:
> This code should be using PTR_ERR() instead of IS_ERR().  And because
> it's using the wrong "dev->client" pointer, the IS_ERR() check will be
> false, meaning the function returns success.
> 
> Fixes: 62f9529b8d5c ("platform/mellanox: mlxreg-lc: Add initial support for Nvidia line card devices")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
>  drivers/platform/mellanox/mlxreg-lc.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/platform/mellanox/mlxreg-lc.c b/drivers/platform/mellanox/mlxreg-lc.c
> index 0b7f58feb701..c897a2f15840 100644
> --- a/drivers/platform/mellanox/mlxreg-lc.c
> +++ b/drivers/platform/mellanox/mlxreg-lc.c
> @@ -413,7 +413,7 @@ mlxreg_lc_create_static_devices(struct mlxreg_lc *mlxreg_lc, struct mlxreg_hotpl
>  				int size)
>  {
>  	struct mlxreg_hotplug_device *dev = devs;
> -	int i;
> +	int i, ret;
>  
>  	/* Create static I2C device feeding by auxiliary or main power. */
>  	for (i = 0; i < size; i++, dev++) {
> @@ -423,6 +423,7 @@ mlxreg_lc_create_static_devices(struct mlxreg_lc *mlxreg_lc, struct mlxreg_hotpl
>  				dev->brdinfo->type, dev->nr, dev->brdinfo->addr);
>  
>  			dev->adapter = NULL;
> +			ret = PTR_ERR(dev->client);
ret is only set on this error path.
can we get to the return without setting ret?

--mark

>  			goto fail_create_static_devices;
>  		}
>  	}
> @@ -435,7 +436,7 @@ mlxreg_lc_create_static_devices(struct mlxreg_lc *mlxreg_lc, struct mlxreg_hotpl
>  		i2c_unregister_device(dev->client);
>  		dev->client = NULL;
>  	}
> -	return IS_ERR(dev->client);
> +	return ret;
>  }
>  
>  static void
> -- 
> 2.20.1
>