linux-kernel - Re: [PATCH] power: charger-manager: fix adding of optional properties

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Date:   Fri, 1 May 2020 15:51:09 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Andrey Smirnov <andrew.smirnov@...il.com>,
        Guenter Roeck <linux@...ck-us.net>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] power: charger-manager: fix adding of optional properties

Hi,

On Fri, May 01, 2020 at 03:39:53PM +0200, Michał Mirosław wrote:
> Use num_properties to index added property.
> This will prevent overwriting POWER_SUPPLY_PROP_CHARGE_NOW with
> POWER_SUPPLY_PROP_CURRENT_NOW and leaving the latter entry
> uninitialized.
> 
> For clarity, num_properties is initialized with length of the copied
> array instead of relying on previously memcpy'd value.
> 
> Fixes: 0a46510addc7 ("power: supply: charger-manager: Prepare for const properties")
> Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> ---

I folded your fix directly into the charger-manager patch, which did
not yet reach linux-next. If you send the num_properties part as a
separate one, I will merge it.

-- Sebastian

>  drivers/power/supply/charger-manager.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/power/supply/charger-manager.c b/drivers/power/supply/charger-manager.c
> index a71e2ee81423..2ef53dc1f2fb 100644
> --- a/drivers/power/supply/charger-manager.c
> +++ b/drivers/power/supply/charger-manager.c
> @@ -1729,7 +1729,7 @@ static int charger_manager_probe(struct platform_device *pdev)
>  	memcpy(properties, default_charger_props,
>  		sizeof(enum power_supply_property) *
>  		ARRAY_SIZE(default_charger_props));
> -	num_properties = psy_default.num_properties;
> +	num_properties = ARRAY_SIZE(default_charger_props);
>  
>  	/* Find which optional psy-properties are available */
>  	fuel_gauge = power_supply_get_by_name(desc->psy_fuel_gauge);
> @@ -1740,14 +1740,14 @@ static int charger_manager_probe(struct platform_device *pdev)
>  	}
>  	if (!power_supply_get_property(fuel_gauge,
>  					  POWER_SUPPLY_PROP_CHARGE_NOW, &val)) {
> -		properties[cm->charger_psy_desc.num_properties] =
> +		properties[num_properties] =
>  				POWER_SUPPLY_PROP_CHARGE_NOW;
>  		num_properties++;
>  	}
>  	if (!power_supply_get_property(fuel_gauge,
>  					  POWER_SUPPLY_PROP_CURRENT_NOW,
>  					  &val)) {
> -		properties[cm->charger_psy_desc.num_properties] =
> +		properties[num_properties] =
>  				POWER_SUPPLY_PROP_CURRENT_NOW;
>  		num_properties++;
>  	}
> -- 
> 2.20.1
> 

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