[PATCH v3 4/4] drivers/thermal/exymos: Use guard notation when acquiring mutex
Anand Moon
linux.amoon at gmail.com
Sun Feb 16 11:58:37 PST 2025
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.
Signed-off-by: Anand Moon <linux.amoon at gmail.com>
---
v3: new patch
---
drivers/thermal/samsung/exynos_tmu.c | 21 +++++++--------------
1 file changed, 7 insertions(+), 14 deletions(-)
diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index fe090c1a93ab..a34ba3858d64 100644
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -256,7 +256,7 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
unsigned int status;
int ret = 0;
- mutex_lock(&data->lock);
+ guard(mutex)(&data->lock);
clk_enable(data->clk);
clk_enable(data->clk_sec);
@@ -270,7 +270,6 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
clk_disable(data->clk_sec);
clk_disable(data->clk);
- mutex_unlock(&data->lock);
return ret;
}
@@ -292,13 +291,12 @@ static int exynos_thermal_zone_configure(struct platform_device *pdev)
return ret;
}
- mutex_lock(&data->lock);
+ guard(mutex)(&data->lock);
clk_enable(data->clk);
data->tmu_set_crit_temp(data, temp / MCELSIUS);
clk_disable(data->clk);
- mutex_unlock(&data->lock);
return 0;
}
@@ -325,12 +323,11 @@ static void exynos_tmu_control(struct platform_device *pdev, bool on)
{
struct exynos_tmu_data *data = platform_get_drvdata(pdev);
- mutex_lock(&data->lock);
+ guard(mutex)(&data->lock);
clk_enable(data->clk);
data->tmu_control(pdev, on);
data->enabled = on;
clk_disable(data->clk);
- mutex_unlock(&data->lock);
}
static void exynos_tmu_update_bit(struct exynos_tmu_data *data, int reg_off,
@@ -645,7 +642,7 @@ static int exynos_get_temp(struct thermal_zone_device *tz, int *temp)
*/
return -EAGAIN;
- mutex_lock(&data->lock);
+ guard(mutex)(&data->lock);
clk_enable(data->clk);
value = data->tmu_read(data);
@@ -655,7 +652,6 @@ static int exynos_get_temp(struct thermal_zone_device *tz, int *temp)
*temp = code_to_temp(data, value) * MCELSIUS;
clk_disable(data->clk);
- mutex_unlock(&data->lock);
return ret;
}
@@ -720,11 +716,10 @@ static int exynos_tmu_set_emulation(struct thermal_zone_device *tz, int temp)
if (temp && temp < MCELSIUS)
goto out;
- mutex_lock(&data->lock);
+ guard(mutex)(&data->lock);
clk_enable(data->clk);
data->tmu_set_emulation(data, temp);
clk_disable(data->clk);
- mutex_unlock(&data->lock);
return 0;
out:
return ret;
@@ -760,14 +755,13 @@ static irqreturn_t exynos_tmu_threaded_irq(int irq, void *id)
thermal_zone_device_update(data->tzd, THERMAL_EVENT_UNSPECIFIED);
- mutex_lock(&data->lock);
+ guard(mutex)(&data->lock);
clk_enable(data->clk);
/* TODO: take action based on particular interrupt */
data->tmu_clear_irqs(data);
clk_disable(data->clk);
- mutex_unlock(&data->lock);
return IRQ_HANDLED;
}
@@ -987,7 +981,7 @@ static int exynos_set_trips(struct thermal_zone_device *tz, int low, int high)
{
struct exynos_tmu_data *data = thermal_zone_device_priv(tz);
- mutex_lock(&data->lock);
+ guard(mutex)(&data->lock);
clk_enable(data->clk);
if (low > INT_MIN)
@@ -1000,7 +994,6 @@ static int exynos_set_trips(struct thermal_zone_device *tz, int low, int high)
data->tmu_disable_high(data);
clk_disable(data->clk);
- mutex_unlock(&data->lock);
return 0;
}
--
2.48.1
More information about the linux-arm-kernel
mailing list