linux-kernel - Re: [5/6] i2c: Ignore the return value of i2c_del_mux

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Message-ID: <20130313060547.GA8607@roeck-us.net>
Date:	Tue, 12 Mar 2013 23:05:47 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Wolfram Sang <wsa@...-dreams.de>, Ben Dooks <ben-linux@...ff.org>,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	Guenter Roeck <guenter.roeck@...csson.com>
Subject: Re: [5/6] i2c: Ignore the return value of i2c_del_mux_adapter()

On Sat, Mar 09, 2013 at 06:16:48PM -0000, Lars-Peter Clausen wrote:
> i2c_del_mux_adapter() always returns 0. So all checks testing whether it will be
> non zero will always evaluate to false and the conditional code is dead code.
> This patch updates all callers of i2c_del_mux_adapter() to ignore its return
> value and assume that it will always succeed (which it will). A subsequent
> patch will make the return type of i2c_del_mux_adapter() void.
> 
> Cc: Guenter Roeck <guenter.roeck@...csson.com>

Acked-by: Guenter Roeck <linux@...ck-us.net>

> Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
> 
> ---
> drivers/i2c/muxes/i2c-mux-pca954x.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c
> index 8e43872..a531d80 100644
> --- a/drivers/i2c/muxes/i2c-mux-pca954x.c
> +++ b/drivers/i2c/muxes/i2c-mux-pca954x.c
> @@ -262,13 +262,11 @@ static int pca954x_remove(struct i2c_client *client)
>  {
>  	struct pca954x *data = i2c_get_clientdata(client);
>  	const struct chip_desc *chip = &chips[data->type];
> -	int i, err;
> +	int i;
>  
>  	for (i = 0; i < chip->nchans; ++i)
>  		if (data->virt_adaps[i]) {
> -			err = i2c_del_mux_adapter(data->virt_adaps[i]);
> -			if (err)
> -				return err;
> +			i2c_del_mux_adapter(data->virt_adaps[i]);
>  			data->virt_adaps[i] = NULL;
>  		}
>  
--
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