diff mbox

[v2,2/7] thermal: rcar_gen3_thermal: remove unneeded mutex

Message ID 20170317155300.21566-3-niklas.soderlund+renesas@ragnatech.se (mailing list archive)
State Superseded, archived
Delegated to: Eduardo Valentin
Headers show

Commit Message

Niklas Söderlund March 17, 2017, 3:52 p.m. UTC 
There is no point in protecting a register read with a lock. This is
most likely a leftover from when the driver was reworked before submitted
for upstream.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---
 drivers/thermal/rcar_gen3_thermal.c | 7 -------
 1 file changed, 7 deletions(-)

Comments

Sergei Shtylyov March 18, 2017, 9:30 a.m. UTC | #1 
On 3/17/2017 6:52 PM, Niklas Söderlund wrote:

> There is no point in protecting a register read with a lock. This is

    Register I/O is usually protected with spinlock...

> most likely a leftover from when the driver was reworked before submitted
> for upstream.

    Before being submitted?

> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
[...]

MBR, Sergei
diff mbox

Patch

diff --git a/drivers/thermal/rcar_gen3_thermal.c b/drivers/thermal/rcar_gen3_thermal.c
index ec477d47d0bae8e5..cb5c362c00009921 100644
--- a/drivers/thermal/rcar_gen3_thermal.c
+++ b/drivers/thermal/rcar_gen3_thermal.c
@@ -20,7 +20,6 @@ 
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/module.h>
-#include <linux/mutex.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
@@ -72,7 +71,6 @@  struct rcar_gen3_thermal_tsc {
 	void __iomem *base;
 	struct thermal_zone_device *zone;
 	struct equation_coefs coef;
-	struct mutex lock;
 };
 
 struct rcar_gen3_thermal_priv {
@@ -163,16 +161,12 @@  static int rcar_gen3_thermal_get_temp(void *devdata, int *temp)
 	u32 reg;
 
 	/* Read register and convert to mili Celsius */
-	mutex_lock(&tsc->lock);
-
 	reg = rcar_gen3_thermal_read(tsc, REG_GEN3_TEMP) & CTEMP_MASK;
 
 	val1 = FIXPT_DIV(FIXPT_INT(reg) - tsc->coef.b1, tsc->coef.a1);
 	val2 = FIXPT_DIV(FIXPT_INT(reg) - tsc->coef.b2, tsc->coef.a2);
 	mcelsius = FIXPT_TO_MCELSIUS((val1 + val2) / 2);
 
-	mutex_unlock(&tsc->lock);
-
 	/* Make sure we are inside specifications */
 	if ((mcelsius < MCELSIUS(-40)) || (mcelsius > MCELSIUS(125)))
 		return -EIO;
@@ -299,7 +293,6 @@  static int rcar_gen3_thermal_probe(struct platform_device *pdev)
 		}
 
 		priv->tscs[i] = tsc;
-		mutex_init(&tsc->lock);
 
 		match_data->thermal_init(tsc);
 		rcar_gen3_thermal_calc_coefs(&tsc->coef, ptat, thcode[i]);