From 2dc387620b85f2061fdcab172efdd9856999e987 Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Wed, 4 Sep 2024 13:55:07 -0700 Subject: [PATCH] Input: regulator-haptic - use guard notation when acquiring mutex Using guard notation makes the code more compact and error handling more robust by ensuring that mutexes are released in all code paths when control leaves critical section. Reviewed-by: Javier Carrasco Link: https://lore.kernel.org/r/ZtjJKxQRRzJE0aWZ@google.com Signed-off-by: Dmitry Torokhov --- drivers/input/misc/regulator-haptic.c | 24 ++++++++---------------- 1 file changed, 8 insertions(+), 16 deletions(-) diff --git a/drivers/input/misc/regulator-haptic.c b/drivers/input/misc/regulator-haptic.c index 02f73b7c0462..3666ba6d1f30 100644 --- a/drivers/input/misc/regulator-haptic.c +++ b/drivers/input/misc/regulator-haptic.c @@ -83,12 +83,10 @@ static void regulator_haptic_work(struct work_struct *work) struct regulator_haptic *haptic = container_of(work, struct regulator_haptic, work); - mutex_lock(&haptic->mutex); + guard(mutex)(&haptic->mutex); if (!haptic->suspended) regulator_haptic_set_voltage(haptic, haptic->magnitude); - - mutex_unlock(&haptic->mutex); } static int regulator_haptic_play_effect(struct input_dev *input, void *data, @@ -205,19 +203,15 @@ static int regulator_haptic_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct regulator_haptic *haptic = platform_get_drvdata(pdev); - int error; - error = mutex_lock_interruptible(&haptic->mutex); - if (error) - return error; - - regulator_haptic_set_voltage(haptic, 0); + scoped_guard(mutex_intr, &haptic->mutex) { + regulator_haptic_set_voltage(haptic, 0); + haptic->suspended = true; - haptic->suspended = true; - - mutex_unlock(&haptic->mutex); + return 0; + } - return 0; + return -EINTR; } static int regulator_haptic_resume(struct device *dev) @@ -226,7 +220,7 @@ static int regulator_haptic_resume(struct device *dev) struct regulator_haptic *haptic = platform_get_drvdata(pdev); unsigned int magnitude; - mutex_lock(&haptic->mutex); + guard(mutex)(&haptic->mutex); haptic->suspended = false; @@ -234,8 +228,6 @@ static int regulator_haptic_resume(struct device *dev) if (magnitude) regulator_haptic_set_voltage(haptic, magnitude); - mutex_unlock(&haptic->mutex); - return 0; } -- 2.25.1