This is a note to let you know that I've just added the patch titled power: supply: max17042: handle fails of reading status register to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: power-supply-max17042-handle-fails-of-reading-status-register.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 54784ffa5b267f57161eb8fbb811499f22a0a0bf Mon Sep 17 00:00:00 2001 From: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx> Date: Mon, 16 Aug 2021 10:27:14 +0200 Subject: power: supply: max17042: handle fails of reading status register From: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx> 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: 39e7213edc4f ("max17042_battery: Support regmap to access device's registers") Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx> Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx> Signed-off-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/power/supply/max17042_battery.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/drivers/power/supply/max17042_battery.c +++ b/drivers/power/supply/max17042_battery.c @@ -760,8 +760,12 @@ static irqreturn_t max17042_thread_handl { 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"); Patches currently in stable-queue which might be from krzysztof.kozlowski@xxxxxxxxxxxxx are queue-4.9/i2c-s3c2410-fix-irq-check.patch queue-4.9/arm64-dts-exynos-correct-gic-cpu-interfaces-address-.patch queue-4.9/power-supply-max17042-handle-fails-of-reading-status-register.patch