[PATCH] regulator: Mark supply_name const and duplicate it as such

[PATCH] regulator: Mark supply_name const and duplicate it as such

[Stephen Boyd]

The supply_name member of struct regulator can be const as we
don't change it in the regulator core. Furthermore, when we copy
the supply name we can use kstrdup_const() here to avoid a copy
if the name is in the ro data section.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---
 drivers/regulator/core.c     | 4 ++--
 drivers/regulator/internal.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index f20ad0a8fc38..49a0b6a2e237 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1343,7 +1343,7 @@ static struct regulator *create_regulator(struct regulator_dev *rdev,
 			/* non-fatal */
 		}
 	} else {
-		regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
+		regulator->supply_name = kstrdup_const(supply_name, GFP_KERNEL);
 		if (regulator->supply_name == NULL)
 			goto overflow_err;
 	}
@@ -1799,7 +1799,7 @@ static void _regulator_put(struct regulator *regulator)
 	put_device(&rdev->dev);
 	mutex_unlock(&rdev->mutex);
 
-	kfree(regulator->supply_name);
+	kfree_const(regulator->supply_name);
 	kfree(regulator);
 
 	module_put(rdev->owner);
diff --git a/drivers/regulator/internal.h b/drivers/regulator/internal.h
index 1dd575b28564..66a8ea0c8386 100644
--- a/drivers/regulator/internal.h
+++ b/drivers/regulator/internal.h
@@ -29,7 +29,7 @@ struct regulator {
 	int uA_load;
 	int min_uV;
 	int max_uV;
-	char *supply_name;
+	const char *supply_name;
 	struct device_attribute dev_attr;
 	struct regulator_dev *rdev;
 	struct dentry *debugfs;
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

Applied "regulator: Mark supply_name const and duplicate it as such" to the regulator tree

[Mark Brown]

The patch

   regulator: Mark supply_name const and duplicate it as such

has been applied to the regulator tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 0630b614391f8cbc35e837b4645ec8faaaa6465e Mon Sep 17 00:00:00 2001
From: Stephen Boyd <sboyd@codeaurora.org>
Date: Thu, 16 Mar 2017 18:07:14 -0700
Subject: [PATCH] regulator: Mark supply_name const and duplicate it as such

The supply_name member of struct regulator can be const as we
don't change it in the regulator core. Furthermore, when we copy
the supply name we can use kstrdup_const() here to avoid a copy
if the name is in the ro data section.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/regulator/core.c     | 4 ++--
 drivers/regulator/internal.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index f20ad0a8fc38..49a0b6a2e237 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1343,7 +1343,7 @@ static struct regulator *create_regulator(struct regulator_dev *rdev,
 			/* non-fatal */
 		}
 	} else {
-		regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
+		regulator->supply_name = kstrdup_const(supply_name, GFP_KERNEL);
 		if (regulator->supply_name == NULL)
 			goto overflow_err;
 	}
@@ -1799,7 +1799,7 @@ static void _regulator_put(struct regulator *regulator)
 	put_device(&rdev->dev);
 	mutex_unlock(&rdev->mutex);
 
-	kfree(regulator->supply_name);
+	kfree_const(regulator->supply_name);
 	kfree(regulator);
 
 	module_put(rdev->owner);
diff --git a/drivers/regulator/internal.h b/drivers/regulator/internal.h
index 1dd575b28564..66a8ea0c8386 100644
--- a/drivers/regulator/internal.h
+++ b/drivers/regulator/internal.h
@@ -29,7 +29,7 @@ struct regulator {
 	int uA_load;
 	int min_uV;
 	int max_uV;
-	char *supply_name;
+	const char *supply_name;
 	struct device_attribute dev_attr;
 	struct regulator_dev *rdev;
 	struct dentry *debugfs;
-- 
2.11.0