linux-kernel - [PATCH] regulator: pwm: No need to make a copy of regulator

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [day] [month] [year] [list]

Date:   Sat, 12 Jan 2019 12:30:13 +0800
From:   Axel Lin <axel.lin@...ics.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Laxman Dewangan <ldewangan@...dia.com>,
        Lee Jones <lee.jones@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        linux-kernel@...r.kernel.org, Axel Lin <axel.lin@...ics.com>
Subject: [PATCH] regulator: pwm: No need to make a copy of regulator_ops per instance

Having instance specific copy of desc is enough to support multiple
instance of pwm regulator.
The regulator_ops is never changed so no need to copy it per instance, make
pwm_regulator_voltage_table_ops and pwm_regulator_voltage_continuous_ops
const to ensure they won't be changed.
The pwm_regulator_desc is a template to be copied so also make it const.

Signed-off-by: Axel Lin <axel.lin@...ics.com>
---
 drivers/regulator/pwm-regulator.c | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c
index a2fd140eff81..3f53f9134b32 100644
--- a/drivers/regulator/pwm-regulator.c
+++ b/drivers/regulator/pwm-regulator.c
@@ -40,9 +40,6 @@ struct pwm_regulator_data {
 	/* regulator descriptor */
 	struct regulator_desc desc;
 
-	/* Regulator ops */
-	struct regulator_ops ops;
-
 	int state;
 
 	/* Enable GPIO */
@@ -231,7 +228,7 @@ static int pwm_regulator_set_voltage(struct regulator_dev *rdev,
 	return 0;
 }
 
-static struct regulator_ops pwm_regulator_voltage_table_ops = {
+static const struct regulator_ops pwm_regulator_voltage_table_ops = {
 	.set_voltage_sel = pwm_regulator_set_voltage_sel,
 	.get_voltage_sel = pwm_regulator_get_voltage_sel,
 	.list_voltage    = pwm_regulator_list_voltage,
@@ -241,7 +238,7 @@ static struct regulator_ops pwm_regulator_voltage_table_ops = {
 	.is_enabled      = pwm_regulator_is_enabled,
 };
 
-static struct regulator_ops pwm_regulator_voltage_continuous_ops = {
+static const struct regulator_ops pwm_regulator_voltage_continuous_ops = {
 	.get_voltage = pwm_regulator_get_voltage,
 	.set_voltage = pwm_regulator_set_voltage,
 	.enable          = pwm_regulator_enable,
@@ -249,7 +246,7 @@ static struct regulator_ops pwm_regulator_voltage_continuous_ops = {
 	.is_enabled      = pwm_regulator_is_enabled,
 };
 
-static struct regulator_desc pwm_regulator_desc = {
+static const struct regulator_desc pwm_regulator_desc = {
 	.name		= "pwm-regulator",
 	.type		= REGULATOR_VOLTAGE,
 	.owner		= THIS_MODULE,
@@ -287,9 +284,7 @@ static int pwm_regulator_init_table(struct platform_device *pdev,
 
 	drvdata->state			= -EINVAL;
 	drvdata->duty_cycle_table	= duty_cycle_table;
-	memcpy(&drvdata->ops, &pwm_regulator_voltage_table_ops,
-	       sizeof(drvdata->ops));
-	drvdata->desc.ops = &drvdata->ops;
+	drvdata->desc.ops = &pwm_regulator_voltage_table_ops;
 	drvdata->desc.n_voltages	= length / sizeof(*duty_cycle_table);
 
 	return 0;
@@ -301,9 +296,7 @@ static int pwm_regulator_init_continuous(struct platform_device *pdev,
 	u32 dutycycle_range[2] = { 0, 100 };
 	u32 dutycycle_unit = 100;
 
-	memcpy(&drvdata->ops, &pwm_regulator_voltage_continuous_ops,
-	       sizeof(drvdata->ops));
-	drvdata->desc.ops = &drvdata->ops;
+	drvdata->desc.ops = &pwm_regulator_voltage_continuous_ops;
 	drvdata->desc.continuous_voltage_range = true;
 
 	of_property_read_u32_array(pdev->dev.of_node,
-- 
2.17.1