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.

---
 drivers/regulator/core.c     | 4 ++--
 drivers/regulator/internal.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

index f20ad0a8fc38..49a0b6a2e237 100644
@@ -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);

index 1dd575b28564..66a8ea0c8386 100644
@@ -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;

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a Linux Foundation Collaborative Project

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: Stephen Boyd <[email protected]>
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.

---
 drivers/regulator/core.c     | 4 ++--
 drivers/regulator/internal.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

index f20ad0a8fc38..49a0b6a2e237 100644
@@ -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);

index 1dd575b28564..66a8ea0c8386 100644
@@ -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