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authorDaniel Lezcano <daniel.lezcano@linaro.org>2017-10-19 19:05:55 +0200
committerEduardo Valentin <edubezval@gmail.com>2017-10-31 19:32:16 -0700
commitcc1ab38d2b2ad3290426c2234cf83e7a323554c7 (patch)
tree563b08ab265824ad06a58153e369528b8b152906 /drivers/thermal
parent81d7cb7946f03d339244e1a822b7da246d8c79ff (diff)
downloadlinux-cc1ab38d2b2ad3290426c2234cf83e7a323554c7.tar.bz2
thermal/drivers/hisi: Remove mutex_lock in the code
The mutex is used to protect against writes in the configuration register. That happens at probe time, with no possible race yet. Then when the module is unloaded and at suspend/resume. When the module is unloaded, it is an userspace operation, thus via a process. Suspending the system goes through the freezer to suspend all the tasks synchronously before continuing. So it is not possible to hit the suspend ops in this driver while we are unloading it. The resume is the same situation than the probe. In other words, even if there are several places where we write the configuration register, there is no situation where we can write it at the same time, so far as I can judge Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Leo Yan <leo.yan@linaro.org> Tested-by: Leo Yan <leo.yan@linaro.org> Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Diffstat (limited to 'drivers/thermal')
-rw-r--r--drivers/thermal/hisi_thermal.c6
1 files changed, 0 insertions, 6 deletions
diff --git a/drivers/thermal/hisi_thermal.c b/drivers/thermal/hisi_thermal.c
index e09b52313ceb..90e91fedc76d 100644
--- a/drivers/thermal/hisi_thermal.c
+++ b/drivers/thermal/hisi_thermal.c
@@ -53,7 +53,6 @@ struct hisi_thermal_sensor {
};
struct hisi_thermal_data {
- struct mutex thermal_lock; /* protects register data */
struct platform_device *pdev;
struct clk *clk;
struct hisi_thermal_sensor sensor;
@@ -200,14 +199,10 @@ static inline void hisi_thermal_hdak_set(void __iomem *addr, int value)
static void hisi_thermal_disable_sensor(struct hisi_thermal_data *data)
{
- mutex_lock(&data->thermal_lock);
-
/* disable sensor module */
hisi_thermal_enable(data->regs, 0);
hisi_thermal_alarm_enable(data->regs, 0);
hisi_thermal_reset_enable(data->regs, 0);
-
- mutex_unlock(&data->thermal_lock);
}
static int hisi_thermal_get_temp(void *__data, int *temp)
@@ -344,7 +339,6 @@ static int hisi_thermal_probe(struct platform_device *pdev)
if (!data)
return -ENOMEM;
- mutex_init(&data->thermal_lock);
data->pdev = pdev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);