diff mbox series

counter: Stop using dev_get_drvdata() to get the counter device

Message ID 20220218092031.167689-1-vilhelm.gray@gmail.com (mailing list archive)
State Handled Elsewhere
Headers show
Series counter: Stop using dev_get_drvdata() to get the counter device | expand

Commit Message

William Breathitt Gray Feb. 18, 2022, 9:20 a.m. UTC 
From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

dev_get_drvdata() returns NULL since commit b56346ddbd82 ("counter: Use
container_of instead of drvdata to track counter_device") which wrongly
claimed there were no users of drvdata. Convert to container_of() to
fix a null pointer dereference.

Reported-by: Oleksij Rempel <o.rempel@pengutronix.de>
Fixes: b56346ddbd82 ("counter: Use container_of instead of drvdata to track counter_device")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
---
 drivers/counter/counter-sysfs.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)


base-commit: e6cb9c167eeb8f90ab924666c573e69e85e700a0

Comments

Uwe Kleine-König Feb. 18, 2022, 10:07 a.m. UTC | #1 
Hello,

On Fri, Feb 18, 2022 at 06:20:31PM +0900, William Breathitt Gray wrote:
> From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> 
> dev_get_drvdata() returns NULL since commit b56346ddbd82 ("counter: Use
> container_of instead of drvdata to track counter_device") which wrongly
> claimed there were no users of drvdata. Convert to container_of() to
> fix a null pointer dereference.
> 
> Reported-by: Oleksij Rempel <o.rempel@pengutronix.de>
> Fixes: b56346ddbd82 ("counter: Use container_of instead of drvdata to track counter_device")
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
> ---

William didn't tell explicitly, so in case there are doubts: This patch
is targeted for v5.17.

Thanks
Uwe
diff mbox series

Patch

diff --git a/drivers/counter/counter-sysfs.c b/drivers/counter/counter-sysfs.c
index 7cc4d1d523ea..04eac41dad33 100644
--- a/drivers/counter/counter-sysfs.c
+++ b/drivers/counter/counter-sysfs.c
@@ -19,6 +19,11 @@ 
 
 #include "counter-sysfs.h"
 
+static inline struct counter_device *counter_from_dev(struct device *dev)
+{
+	return container_of(dev, struct counter_device, dev);
+}
+
 /**
  * struct counter_attribute - Counter sysfs attribute
  * @dev_attr:	device attribute for sysfs
@@ -90,7 +95,7 @@  static ssize_t counter_comp_u8_show(struct device *dev,
 				    struct device_attribute *attr, char *buf)
 {
 	const struct counter_attribute *const a = to_counter_attribute(attr);
-	struct counter_device *const counter = dev_get_drvdata(dev);
+	struct counter_device *const counter = counter_from_dev(dev);
 	int err;
 	u8 data = 0;
 
@@ -122,7 +127,7 @@  static ssize_t counter_comp_u8_store(struct device *dev,
 				     const char *buf, size_t len)
 {
 	const struct counter_attribute *const a = to_counter_attribute(attr);
-	struct counter_device *const counter = dev_get_drvdata(dev);
+	struct counter_device *const counter = counter_from_dev(dev);
 	int err;
 	bool bool_data = 0;
 	u8 data = 0;
@@ -158,7 +163,7 @@  static ssize_t counter_comp_u32_show(struct device *dev,
 				     struct device_attribute *attr, char *buf)
 {
 	const struct counter_attribute *const a = to_counter_attribute(attr);
-	struct counter_device *const counter = dev_get_drvdata(dev);
+	struct counter_device *const counter = counter_from_dev(dev);
 	const struct counter_available *const avail = a->comp.priv;
 	int err;
 	u32 data = 0;
@@ -221,7 +226,7 @@  static ssize_t counter_comp_u32_store(struct device *dev,
 				      const char *buf, size_t len)
 {
 	const struct counter_attribute *const a = to_counter_attribute(attr);
-	struct counter_device *const counter = dev_get_drvdata(dev);
+	struct counter_device *const counter = counter_from_dev(dev);
 	struct counter_count *const count = a->parent;
 	struct counter_synapse *const synapse = a->comp.priv;
 	const struct counter_available *const avail = a->comp.priv;
@@ -281,7 +286,7 @@  static ssize_t counter_comp_u64_show(struct device *dev,
 				     struct device_attribute *attr, char *buf)
 {
 	const struct counter_attribute *const a = to_counter_attribute(attr);
-	struct counter_device *const counter = dev_get_drvdata(dev);
+	struct counter_device *const counter = counter_from_dev(dev);
 	int err;
 	u64 data = 0;
 
@@ -309,7 +314,7 @@  static ssize_t counter_comp_u64_store(struct device *dev,
 				      const char *buf, size_t len)
 {
 	const struct counter_attribute *const a = to_counter_attribute(attr);
-	struct counter_device *const counter = dev_get_drvdata(dev);
+	struct counter_device *const counter = counter_from_dev(dev);
 	int err;
 	u64 data = 0;