* [RESEND PATCH 1/1] counter: Stop using dev_get_drvdata() to get the counter device
2022-03-15 19:43 [RESEND PATCH 0/1] First set of Counter fixes for the 5.17 cycle William Breathitt Gray
@ 2022-03-15 19:43 ` William Breathitt Gray
0 siblings, 0 replies; 2+ messages in thread
From: William Breathitt Gray @ 2022-03-15 19:43 UTC (permalink / raw)
To: gregkh
Cc: linux-kernel, linux-iio, Uwe Kleine-König, Oleksij Rempel,
Jarkko Nikula, William Breathitt Gray
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>
Link: https://lore.kernel.org/all/20220204082556.370348-1-u.kleine-koenig@pengutronix.de/
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
---
drivers/counter/counter-sysfs.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)
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;
--
2.35.1
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