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

From: Stephen Boyd
Date: Thu Mar 16 2017 - 21:07:14 EST


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@xxxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
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