linux-kernel - Re: [PATCH] counter: Stop using dev_get

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Date:   Tue, 8 Feb 2022 10:42:18 +0900
From:   William Breathitt Gray <vilhelm.gray@...il.com>
To:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc:     linux-iio@...r.kernel.org,
        Robin van der Gracht <robin@...tonic.nl>,
        linux-kernel@...r.kernel.org,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        David Jander <david@...tonic.nl>,
        Jonathan Cameron <jic23@...nel.org>
Subject: Re: [PATCH] counter: Stop using dev_get_drvdata() to get the counter
 device

On Fri, Feb 04, 2022 at 09:25:56AM +0100, Uwe Kleine-König wrote:
> 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@...gutronix.de>
> Fixes: b56346ddbd82 ("counter: Use container_of instead of drvdata to track counter_device")
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

I'll pick this up and apply it to my tree.

Thanks,

William Breathitt Gray

> ---
>  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;
>  
> 
> base-commit: e783362eb54cd99b2cac8b3a9aeac942e6f6ac07
> -- 
> 2.34.1
> 

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