linux-kernel - Re: [PATCH 1/2] FIX: engine

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Date:	Mon, 18 Apr 2011 13:21:25 +0200
From:	Jonathan Neuschäfer <j.neuschaefer@....net>
To:	Raghavendra D Prabhu <rprabhu@...hang.net>
Cc:	Richard Purdie <rpurdie@...ys.net>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] FIX: engine_state is uninitialized

On Sat, Apr 16, 2011 at 02:13:13PM +0530, Raghavendra D Prabhu wrote:
> In case lp5521_read() returns EIO, engine_state is in an uninitialized state. This
> adds checks to fix that.
>
> Signed-off-by: Raghavendra D Prabhu <rprabhu@...hang.net>
> ---
>  drivers/leds/leds-lp5521.c |   10 ++++++----
>  1 files changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c
> index c0cff64..6c5eac0 100644
> --- a/drivers/leds/leds-lp5521.c
> +++ b/drivers/leds/leds-lp5521.c
> @@ -176,11 +176,13 @@ static int lp5521_set_engine_mode(struct lp5521_engine *engine, u8 mode)
>  	ret = lp5521_read(client, LP5521_REG_OP_MODE, &engine_state);
> +	if (ret == 0){
>  	/* set mode only for this engine */
> -	engine_state &= ~(engine->engine_mask);
> -	mode &= engine->engine_mask;
> -	engine_state |= mode;
> -	ret |= lp5521_write(client, LP5521_REG_OP_MODE, engine_state);
> +		engine_state &= ~(engine->engine_mask);
> +		mode &= engine->engine_mask;
> +		engine_state |= mode;
> +		ret |= lp5521_write(client, LP5521_REG_OP_MODE, engine_state);
> +	}
>  	return ret;
>  }
> --
> 1.7.4.4

Usually something like

	if (ret < 0)
		goto out;

	/* some code here */

out:
	return ret;

is preferred to avoid unnecessary nesting/indentation. Anyway, thanks for the
patch (although I'm not the maintainer, but just commenting).

Thanks,
	Jonathan Neuschäfer
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