linux-kernel - Re: [PATCH 1/3] power: supply: max17042: handle fails of reading status register

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Date:   Mon, 16 Aug 2021 10:42:01 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        stable@...r.kernel.org
Subject: Re: [PATCH 1/3] power: supply: max17042: handle fails of reading
 status register

Hi,

On 8/16/21 10:27 AM, Krzysztof Kozlowski wrote:
> Reading status register can fail in the interrupt handler.  In such
> case, the regmap_read() will not store anything useful under passed
> 'val' variable and random stack value will be used to determine type of
> interrupt.
> 
> Handle the regmap_read() failure to avoid handling interrupt type and
> triggering changed power supply event based on random stack value.
> 
> Fixes: 39e7213edc4f ("max17042_battery: Support regmap to access device's registers")
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>

Thanks, the entire series looks good to me:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

For the series.

Regards,

Hans

> ---
>  drivers/power/supply/max17042_battery.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/power/supply/max17042_battery.c b/drivers/power/supply/max17042_battery.c
> index ce2041b30a06..858ae97600d4 100644
> --- a/drivers/power/supply/max17042_battery.c
> +++ b/drivers/power/supply/max17042_battery.c
> @@ -869,8 +869,12 @@ static irqreturn_t max17042_thread_handler(int id, void *dev)
>  {
>  	struct max17042_chip *chip = dev;
>  	u32 val;
> +	int ret;
> +
> +	ret = regmap_read(chip->regmap, MAX17042_STATUS, &val);
> +	if (ret)
> +		return IRQ_HANDLED;
>  
> -	regmap_read(chip->regmap, MAX17042_STATUS, &val);
>  	if ((val & STATUS_INTR_SOCMIN_BIT) ||
>  		(val & STATUS_INTR_SOCMAX_BIT)) {
>  		dev_info(&chip->client->dev, "SOC threshold INTR\n");
>