[PATCH 13/25] thermal/drivers/hisi: Remove mutex_lock in the code

From: Daniel Lezcano <daniel.lezcano@linaro.org>
To: edubezval@gmail.com, rui.zhang@intel.com
Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
	kevin.wangtao@linaro.org, Leo Yan <leo.yan@linaro.org>
Subject: [PATCH 13/25] thermal/drivers/hisi: Remove mutex_lock in the code
Date: Tue, 10 Oct 2017 20:02:38 +0200	[thread overview]
Message-ID: <1507658570-32675-13-git-send-email-daniel.lezcano@linaro.org> (raw)
In-Reply-To: <1507658570-32675-1-git-send-email-daniel.lezcano@linaro.org>

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>
---
 drivers/thermal/hisi_thermal.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/thermal/hisi_thermal.c b/drivers/thermal/hisi_thermal.c
index 5b0b5be..241d42c 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);
-- 
2.7.4
