linux-kernel - Re: [PATCH] power: twl4030: fix a missing check of return value

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Date:   Sun, 20 Jan 2019 22:38:53 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     Kangjie Lu <kjlu@....edu>
Cc:     pakki001@....edu, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] power: twl4030: fix a missing check of return value

Hi,

On Thu, Dec 20, 2018 at 01:51:24PM -0600, Kangjie Lu wrote:
> If twl4030_bci_read() fails, the read data in "s" is incorrect,
> which is however used in the following execution. The fix checks
> the return value of twl4030_bci_read() and returns an error code
> upstream upon the failure of twl4030_bci_read().
> 
> Signed-off-by: Kangjie Lu <kjlu@....edu>
> ---

Thanks, queued to power-supply-next.

-- Sebastian

>  drivers/power/supply/twl4030_charger.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/power/supply/twl4030_charger.c b/drivers/power/supply/twl4030_charger.c
> index 0e202d4273fb..4299873a1118 100644
> --- a/drivers/power/supply/twl4030_charger.c
> +++ b/drivers/power/supply/twl4030_charger.c
> @@ -809,7 +809,9 @@ static int twl4030_bci_get_property(struct power_supply *psy,
>  		is_charging = state & TWL4030_MSTATEC_AC;
>  	if (!is_charging) {
>  		u8 s;
> -		twl4030_bci_read(TWL4030_BCIMDEN, &s);
> +		ret = twl4030_bci_read(TWL4030_BCIMDEN, &s);
> +		if (ret < 0)
> +			return ret;
>  		if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
>  			is_charging = s & 1;
>  		else
> -- 
> 2.17.1
> 

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