linux-kernel - Re: [PATCH 09/69] leds: lp5523: check return value of lp5xx

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Date:   Mon, 3 May 2021 21:36:14 +0200
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     Phillip Potter <phil@...lpotter.co.uk>,
        stable <stable@...r.kernel.org>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        Pavel Machek <pavel@....cz>
Subject: Re: [PATCH 09/69] leds: lp5523: check return value of lp5xx_read and
 jump to cleanup code

On 5/3/21 1:56 PM, Greg Kroah-Hartman wrote:
> From: Phillip Potter <phil@...lpotter.co.uk>
> 
> Check return value of lp5xx_read and if non-zero, jump to code at end of
> the function, causing lp5523_stop_all_engines to be executed before
> returning the error value up the call chain. This fixes the original
> commit (248b57015f35) which was reverted due to the University of Minnesota
> problems.
> 
> Cc: Jacek Anaszewski <jacek.anaszewski@...il.com>
> Cc: stable <stable@...r.kernel.org>
> Signed-off-by: Phillip Potter <phil@...lpotter.co.uk>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>   drivers/leds/leds-lp5523.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/leds/leds-lp5523.c b/drivers/leds/leds-lp5523.c
> index 5036d7d5f3d4..b1590cb4a188 100644
> --- a/drivers/leds/leds-lp5523.c
> +++ b/drivers/leds/leds-lp5523.c
> @@ -305,7 +305,9 @@ static int lp5523_init_program_engine(struct lp55xx_chip *chip)
>   
>   	/* Let the programs run for couple of ms and check the engine status */
>   	usleep_range(3000, 6000);
> -	lp55xx_read(chip, LP5523_REG_STATUS, &status);
> +	ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
> +	if (ret)
> +		goto out;
>   	status &= LP5523_ENG_STATUS_MASK;
>   
>   	if (status != LP5523_ENG_STATUS_MASK) {
> 

Acked-by: Jacek Anaszewski <jacek.anaszewski@...il.com>

Cc: Pavel Machek <pavel@....cz>, linux-leds@...r.kernel.org

-- 
Best regards,
Jacek Anaszewski