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power: supply: max17042: handle fails of reading status register 

commit 54784ffa5b267f57161eb8fbb811499f22a0a0bf upstream.

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: 39e7213edc ("max17042_battery: Support regmap to access device's registers")
Cc: <stable@vger.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Krzysztof Kozlowski 2021-08-16 10:27:14 +02:00 committed by Greg Kroah-Hartman
parent 668370dd4c
commit a6d4ac3f86
1 changed files with 5 additions and 1 deletions
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6
drivers/power/supply/max17042_battery.c
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@ -842,8 +842,12 @@ 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");