linux-kernel - Re: [patch] leds: leds-lp5521: return an error code on error in probe()

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Message-ID: <CAK5ve-Li0O5b7WL6R+RL6+=4FAV=NSLfMt99rG+k7ruTEPNVEg@mail.gmail.com>
Date:	Mon, 3 Dec 2012 11:18:52 -0800
From:	Bryan Wu <cooloney@...il.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Richard Purdie <rpurdie@...ys.net>, linux-leds@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] leds: leds-lp5521: return an error code on error in probe()

On Sun, Dec 2, 2012 at 9:29 AM, Dan Carpenter <dan.carpenter@...cle.com> wrote:
> If "buf" wasn't equal to LP5521_REG_R_CURR_DEFAULT the probe fails but
> we still return zero.  I've changed it to print an error message and
> return -EINVAL.
>

Looks fine with me, I applied it to my for-next branch.

-Bryan

> Reported-by: Ben Hutchings <ben@...adent.org.uk>
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
>
> diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c
> index 2bee6b9..cb8a522 100644
> --- a/drivers/leds/leds-lp5521.c
> +++ b/drivers/leds/leds-lp5521.c
> @@ -788,10 +788,17 @@ static int lp5521_probe(struct i2c_client *client,
>          * LP5521_REG_ENABLE register will not have any effect - strange!
>          */
>         ret = lp5521_read(client, LP5521_REG_R_CURRENT, &buf);
> -       if (ret || buf != LP5521_REG_R_CURR_DEFAULT) {
> +       if (ret) {
>                 dev_err(&client->dev, "error in resetting chip\n");
>                 goto fail2;
>         }
> +       if (buf != LP5521_REG_R_CURR_DEFAULT) {
> +               dev_err(&client->dev,
> +                       "unexpected data in register (expected 0x%x got 0x%x)\n",
> +                       LP5521_REG_R_CURR_DEFAULT, buf);
> +               ret = -EINVAL;
> +               goto fail2;
> +       }
>         usleep_range(10000, 20000);
>
>         ret = lp5521_detect(client);
--
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