[PATCH] cros_ec: Use devm_kzalloc for private data

[PATCH] cros_ec: Use devm_kzalloc for private data

[Gwendal Grignou]

Use dev_kzmalloc, remove .release entry point.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
---
 drivers/mfd/cros_ec_dev.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
index eafd06f62a3a..45d42511a3e5 100644
--- a/drivers/mfd/cros_ec_dev.c
+++ b/drivers/mfd/cros_ec_dev.c
@@ -262,13 +262,6 @@ static const struct file_operations fops = {
 #endif
 };
 
-static void __remove(struct device *dev)
-{
-	struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev,
-					      class_dev);
-	kfree(ec);
-}
-
 static void cros_ec_sensors_register(struct cros_ec_dev *ec)
 {
 	/*
@@ -388,7 +381,7 @@ static int ec_device_probe(struct platform_device *pdev)
 	int retval = -ENOMEM;
 	struct device *dev = &pdev->dev;
 	struct cros_ec_platform *ec_platform = dev_get_platdata(dev);
-	struct cros_ec_dev *ec = kzalloc(sizeof(*ec), GFP_KERNEL);
+	struct cros_ec_dev *ec = devm_kzalloc(dev, sizeof(*ec), GFP_KERNEL);
 
 	if (!ec)
 		return retval;
@@ -410,7 +403,6 @@ static int ec_device_probe(struct platform_device *pdev)
 	ec->class_dev.devt = MKDEV(ec_major, pdev->id);
 	ec->class_dev.class = &cros_class;
 	ec->class_dev.parent = dev;
-	ec->class_dev.release = __remove;
 
 	retval = dev_set_name(&ec->class_dev, "%s", ec_platform->ec_name);
 	if (retval) {
-- 
2.17.0.441.gb46fe60e1d-goog

Re: [PATCH] cros_ec: Use devm_kzalloc for private data

[Enric Balletbo Serra]

Hi Gwendal,

2018-05-10 1:06 GMT+02:00 Gwendal Grignou <gwendal@chromium.org>:
> Use dev_kzmalloc, remove .release entry point.
>
> Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
> ---
>  drivers/mfd/cros_ec_dev.c | 10 +---------
>  1 file changed, 1 insertion(+), 9 deletions(-)
>
> diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
> index eafd06f62a3a..45d42511a3e5 100644
> --- a/drivers/mfd/cros_ec_dev.c
> +++ b/drivers/mfd/cros_ec_dev.c
> @@ -262,13 +262,6 @@ static const struct file_operations fops = {
>  #endif
>  };
>
> -static void __remove(struct device *dev)
> -{
> -       struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev,
> -                                             class_dev);
> -       kfree(ec);
> -}
> -
>  static void cros_ec_sensors_register(struct cros_ec_dev *ec)
>  {
>         /*
> @@ -388,7 +381,7 @@ static int ec_device_probe(struct platform_device *pdev)
>         int retval = -ENOMEM;
>         struct device *dev = &pdev->dev;
>         struct cros_ec_platform *ec_platform = dev_get_platdata(dev);
> -       struct cros_ec_dev *ec = kzalloc(sizeof(*ec), GFP_KERNEL);
> +       struct cros_ec_dev *ec = devm_kzalloc(dev, sizeof(*ec), GFP_KERNEL);
>
>         if (!ec)
>                 return retval;
> @@ -410,7 +403,6 @@ static int ec_device_probe(struct platform_device *pdev)
>         ec->class_dev.devt = MKDEV(ec_major, pdev->id);
>         ec->class_dev.class = &cros_class;
>         ec->class_dev.parent = dev;
> -       ec->class_dev.release = __remove;
>
>         retval = dev_set_name(&ec->class_dev, "%s", ec_platform->ec_name);
>         if (retval) {
> --
> 2.17.0.441.gb46fe60e1d-goog
>

The patch looks good to me, however, the patch doesn't apply cleanly
if you have [1] already applied, and if not, then is this patch ([2])
which doesn't apply cleanly. To not have interdependencies I'd suggest
apply first this patch and remove the following from [1]

diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
index eafd06f62a3a..cad12da7f884 100644
--- a/drivers/mfd/cros_ec_dev.c
+++ b/drivers/mfd/cros_ec_dev.c
@@ -264,8 +264,8 @@ static const struct file_operations fops = {

 static void __remove(struct device *dev)
 {
-       struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev,
-                                             class_dev);
+       struct cros_ec_dev *ec = to_cros_ec_dev(dev);
+
        kfree(ec);
 }

With this change, [1] can go through the Benson tree and [2] through
Lee tree independently. With the above change feel free to add my

Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>

If you want I can do this rework for you.

Best regards,
 Enric

[1] https://patchwork.kernel.org/patch/10390959/
[2] https://patchwork.kernel.org/patch/10390965/

[PATCH v2] platform/chrome: Use to_cros_ec_dev more broadly

[Gwendal Grignou]

Move to_cros_ec_dev macro to cros_ec.h and use it when the private ec
object is needed from device object.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
---
Change since v1:
   Remove changes in cros_ec_dev.c to avoid inter-dependencies.

 drivers/platform/chrome/cros_ec_lightbar.c | 21 +++++++--------------
 drivers/platform/chrome/cros_ec_sysfs.c    |  2 --
 drivers/platform/chrome/cros_ec_vbc.c      |  9 +++------
 include/linux/mfd/cros_ec.h                |  2 ++
 4 files changed, 12 insertions(+), 22 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_lightbar.c b/drivers/platform/chrome/cros_ec_lightbar.c
index 6ea79d495aa2..68193bb53383 100644
--- a/drivers/platform/chrome/cros_ec_lightbar.c
+++ b/drivers/platform/chrome/cros_ec_lightbar.c
@@ -170,8 +170,7 @@ static ssize_t version_show(struct device *dev,
 			    struct device_attribute *attr, char *buf)
 {
 	uint32_t version = 0, flags = 0;
-	struct cros_ec_dev *ec = container_of(dev,
-					      struct cros_ec_dev, class_dev);
+	struct cros_ec_dev *ec = to_cros_ec_dev(dev);
 	int ret;
 
 	ret = lb_throttle();
@@ -193,8 +192,7 @@ static ssize_t brightness_store(struct device *dev,
 	struct cros_ec_command *msg;
 	int ret;
 	unsigned int val;
-	struct cros_ec_dev *ec = container_of(dev,
-					      struct cros_ec_dev, class_dev);
+	struct cros_ec_dev *ec = to_cros_ec_dev(dev);
 
 	if (kstrtouint(buf, 0, &val))
 		return -EINVAL;
@@ -238,8 +236,7 @@ static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr,
 {
 	struct ec_params_lightbar *param;
 	struct cros_ec_command *msg;
-	struct cros_ec_dev *ec = container_of(dev,
-					      struct cros_ec_dev, class_dev);
+	struct cros_ec_dev *ec = to_cros_ec_dev(dev);
 	unsigned int val[4];
 	int ret, i = 0, j = 0, ok = 0;
 
@@ -311,8 +308,7 @@ static ssize_t sequence_show(struct device *dev,
 	struct ec_response_lightbar *resp;
 	struct cros_ec_command *msg;
 	int ret;
-	struct cros_ec_dev *ec = container_of(dev,
-					      struct cros_ec_dev, class_dev);
+	struct cros_ec_dev *ec = to_cros_ec_dev(dev);
 
 	msg = alloc_lightbar_cmd_msg(ec);
 	if (!msg)
@@ -439,8 +435,7 @@ static ssize_t sequence_store(struct device *dev, struct device_attribute *attr,
 	struct cros_ec_command *msg;
 	unsigned int num;
 	int ret, len;
-	struct cros_ec_dev *ec = container_of(dev,
-					      struct cros_ec_dev, class_dev);
+	struct cros_ec_dev *ec = to_cros_ec_dev(dev);
 
 	for (len = 0; len < count; len++)
 		if (!isalnum(buf[len]))
@@ -488,8 +483,7 @@ static ssize_t program_store(struct device *dev, struct device_attribute *attr,
 	int extra_bytes, max_size, ret;
 	struct ec_params_lightbar *param;
 	struct cros_ec_command *msg;
-	struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev,
-					      class_dev);
+	struct cros_ec_dev *ec = to_cros_ec_dev(dev);
 
 	/*
 	 * We might need to reject the program for size reasons. The EC
@@ -599,8 +593,7 @@ static umode_t cros_ec_lightbar_attrs_are_visible(struct kobject *kobj,
 						  struct attribute *a, int n)
 {
 	struct device *dev = container_of(kobj, struct device, kobj);
-	struct cros_ec_dev *ec = container_of(dev,
-					      struct cros_ec_dev, class_dev);
+	struct cros_ec_dev *ec = to_cros_ec_dev(dev);
 	struct platform_device *pdev = to_platform_device(ec->dev);
 	struct cros_ec_platform *pdata = pdev->dev.platform_data;
 	int is_cros_ec;
diff --git a/drivers/platform/chrome/cros_ec_sysfs.c b/drivers/platform/chrome/cros_ec_sysfs.c
index 5a6db3fe213a..f34a50121064 100644
--- a/drivers/platform/chrome/cros_ec_sysfs.c
+++ b/drivers/platform/chrome/cros_ec_sysfs.c
@@ -34,8 +34,6 @@
 #include <linux/types.h>
 #include <linux/uaccess.h>
 
-#define to_cros_ec_dev(dev)  container_of(dev, struct cros_ec_dev, class_dev)
-
 /* Accessor functions */
 
 static ssize_t reboot_show(struct device *dev,
diff --git a/drivers/platform/chrome/cros_ec_vbc.c b/drivers/platform/chrome/cros_ec_vbc.c
index 6d38e6b08334..5356f26bc022 100644
--- a/drivers/platform/chrome/cros_ec_vbc.c
+++ b/drivers/platform/chrome/cros_ec_vbc.c
@@ -29,8 +29,7 @@ static ssize_t vboot_context_read(struct file *filp, struct kobject *kobj,
 				  loff_t pos, size_t count)
 {
 	struct device *dev = container_of(kobj, struct device, kobj);
-	struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev,
-					      class_dev);
+	struct cros_ec_dev *ec = to_cros_ec_dev(dev);
 	struct cros_ec_device *ecdev = ec->ec_dev;
 	struct ec_params_vbnvcontext *params;
 	struct cros_ec_command *msg;
@@ -70,8 +69,7 @@ static ssize_t vboot_context_write(struct file *filp, struct kobject *kobj,
 				   loff_t pos, size_t count)
 {
 	struct device *dev = container_of(kobj, struct device, kobj);
-	struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev,
-					      class_dev);
+	struct cros_ec_dev *ec = to_cros_ec_dev(dev);
 	struct cros_ec_device *ecdev = ec->ec_dev;
 	struct ec_params_vbnvcontext *params;
 	struct cros_ec_command *msg;
@@ -111,8 +109,7 @@ static umode_t cros_ec_vbc_is_visible(struct kobject *kobj,
 				      struct bin_attribute *a, int n)
 {
 	struct device *dev = container_of(kobj, struct device, kobj);
-	struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev,
-					      class_dev);
+	struct cros_ec_dev *ec = to_cros_ec_dev(dev);
 	struct device_node *np = ec->ec_dev->dev->of_node;
 
 	if (IS_ENABLED(CONFIG_OF) && np) {
diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
index 4ff0cec979b0..4270972adb94 100644
--- a/include/linux/mfd/cros_ec.h
+++ b/include/linux/mfd/cros_ec.h
@@ -197,6 +197,8 @@ struct cros_ec_dev {
 	u32 features[2];
 };
 
+#define to_cros_ec_dev(dev)  container_of(dev, struct cros_ec_dev, class_dev)
+
 /**
  * cros_ec_suspend - Handle a suspend operation for the ChromeOS EC device
  *
-- 
2.17.0.921.gf22659ad46-goog

Re: [PATCH v2] platform/chrome: Use to_cros_ec_dev more broadly

[Enric Balletbo Serra]

Hi Gwendal,

2018-05-30 18:04 GMT+02:00 Gwendal Grignou <gwendal@chromium.org>:
> Move to_cros_ec_dev macro to cros_ec.h and use it when the private ec
> object is needed from device object.
>
> Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
> ---
> Change since v1:
>    Remove changes in cros_ec_dev.c to avoid inter-dependencies.
>
>  drivers/platform/chrome/cros_ec_lightbar.c | 21 +++++++--------------
>  drivers/platform/chrome/cros_ec_sysfs.c    |  2 --
>  drivers/platform/chrome/cros_ec_vbc.c      |  9 +++------
>  include/linux/mfd/cros_ec.h                |  2 ++
>  4 files changed, 12 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/platform/chrome/cros_ec_lightbar.c b/drivers/platform/chrome/cros_ec_lightbar.c
> index 6ea79d495aa2..68193bb53383 100644
> --- a/drivers/platform/chrome/cros_ec_lightbar.c
> +++ b/drivers/platform/chrome/cros_ec_lightbar.c
> @@ -170,8 +170,7 @@ static ssize_t version_show(struct device *dev,
>                             struct device_attribute *attr, char *buf)
>  {
>         uint32_t version = 0, flags = 0;
> -       struct cros_ec_dev *ec = container_of(dev,
> -                                             struct cros_ec_dev, class_dev);
> +       struct cros_ec_dev *ec = to_cros_ec_dev(dev);
>         int ret;
>
>         ret = lb_throttle();
> @@ -193,8 +192,7 @@ static ssize_t brightness_store(struct device *dev,
>         struct cros_ec_command *msg;
>         int ret;
>         unsigned int val;
> -       struct cros_ec_dev *ec = container_of(dev,
> -                                             struct cros_ec_dev, class_dev);
> +       struct cros_ec_dev *ec = to_cros_ec_dev(dev);
>
>         if (kstrtouint(buf, 0, &val))
>                 return -EINVAL;
> @@ -238,8 +236,7 @@ static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr,
>  {
>         struct ec_params_lightbar *param;
>         struct cros_ec_command *msg;
> -       struct cros_ec_dev *ec = container_of(dev,
> -                                             struct cros_ec_dev, class_dev);
> +       struct cros_ec_dev *ec = to_cros_ec_dev(dev);
>         unsigned int val[4];
>         int ret, i = 0, j = 0, ok = 0;
>
> @@ -311,8 +308,7 @@ static ssize_t sequence_show(struct device *dev,
>         struct ec_response_lightbar *resp;
>         struct cros_ec_command *msg;
>         int ret;
> -       struct cros_ec_dev *ec = container_of(dev,
> -                                             struct cros_ec_dev, class_dev);
> +       struct cros_ec_dev *ec = to_cros_ec_dev(dev);
>
>         msg = alloc_lightbar_cmd_msg(ec);
>         if (!msg)
> @@ -439,8 +435,7 @@ static ssize_t sequence_store(struct device *dev, struct device_attribute *attr,
>         struct cros_ec_command *msg;
>         unsigned int num;
>         int ret, len;
> -       struct cros_ec_dev *ec = container_of(dev,
> -                                             struct cros_ec_dev, class_dev);
> +       struct cros_ec_dev *ec = to_cros_ec_dev(dev);
>
>         for (len = 0; len < count; len++)
>                 if (!isalnum(buf[len]))
> @@ -488,8 +483,7 @@ static ssize_t program_store(struct device *dev, struct device_attribute *attr,
>         int extra_bytes, max_size, ret;
>         struct ec_params_lightbar *param;
>         struct cros_ec_command *msg;
> -       struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev,
> -                                             class_dev);
> +       struct cros_ec_dev *ec = to_cros_ec_dev(dev);
>
>         /*
>          * We might need to reject the program for size reasons. The EC
> @@ -599,8 +593,7 @@ static umode_t cros_ec_lightbar_attrs_are_visible(struct kobject *kobj,
>                                                   struct attribute *a, int n)
>  {
>         struct device *dev = container_of(kobj, struct device, kobj);
> -       struct cros_ec_dev *ec = container_of(dev,
> -                                             struct cros_ec_dev, class_dev);
> +       struct cros_ec_dev *ec = to_cros_ec_dev(dev);
>         struct platform_device *pdev = to_platform_device(ec->dev);
>         struct cros_ec_platform *pdata = pdev->dev.platform_data;
>         int is_cros_ec;
> diff --git a/drivers/platform/chrome/cros_ec_sysfs.c b/drivers/platform/chrome/cros_ec_sysfs.c
> index 5a6db3fe213a..f34a50121064 100644
> --- a/drivers/platform/chrome/cros_ec_sysfs.c
> +++ b/drivers/platform/chrome/cros_ec_sysfs.c
> @@ -34,8 +34,6 @@
>  #include <linux/types.h>
>  #include <linux/uaccess.h>
>
> -#define to_cros_ec_dev(dev)  container_of(dev, struct cros_ec_dev, class_dev)
> -
>  /* Accessor functions */
>
>  static ssize_t reboot_show(struct device *dev,
> diff --git a/drivers/platform/chrome/cros_ec_vbc.c b/drivers/platform/chrome/cros_ec_vbc.c
> index 6d38e6b08334..5356f26bc022 100644
> --- a/drivers/platform/chrome/cros_ec_vbc.c
> +++ b/drivers/platform/chrome/cros_ec_vbc.c
> @@ -29,8 +29,7 @@ static ssize_t vboot_context_read(struct file *filp, struct kobject *kobj,
>                                   loff_t pos, size_t count)
>  {
>         struct device *dev = container_of(kobj, struct device, kobj);
> -       struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev,
> -                                             class_dev);
> +       struct cros_ec_dev *ec = to_cros_ec_dev(dev);
>         struct cros_ec_device *ecdev = ec->ec_dev;
>         struct ec_params_vbnvcontext *params;
>         struct cros_ec_command *msg;
> @@ -70,8 +69,7 @@ static ssize_t vboot_context_write(struct file *filp, struct kobject *kobj,
>                                    loff_t pos, size_t count)
>  {
>         struct device *dev = container_of(kobj, struct device, kobj);
> -       struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev,
> -                                             class_dev);
> +       struct cros_ec_dev *ec = to_cros_ec_dev(dev);
>         struct cros_ec_device *ecdev = ec->ec_dev;
>         struct ec_params_vbnvcontext *params;
>         struct cros_ec_command *msg;
> @@ -111,8 +109,7 @@ static umode_t cros_ec_vbc_is_visible(struct kobject *kobj,
>                                       struct bin_attribute *a, int n)
>  {
>         struct device *dev = container_of(kobj, struct device, kobj);
> -       struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev,
> -                                             class_dev);
> +       struct cros_ec_dev *ec = to_cros_ec_dev(dev);
>         struct device_node *np = ec->ec_dev->dev->of_node;
>
>         if (IS_ENABLED(CONFIG_OF) && np) {
> diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
> index 4ff0cec979b0..4270972adb94 100644
> --- a/include/linux/mfd/cros_ec.h
> +++ b/include/linux/mfd/cros_ec.h
> @@ -197,6 +197,8 @@ struct cros_ec_dev {
>         u32 features[2];
>  };
>
> +#define to_cros_ec_dev(dev)  container_of(dev, struct cros_ec_dev, class_dev)
> +
>  /**
>   * cros_ec_suspend - Handle a suspend operation for the ChromeOS EC device
>   *
> --
> 2.17.0.921.gf22659ad46-goog
>

The patch looks good to me.

Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>

Thanks,
 Enric

[PATCH v2] cros_ec: Use devm_kzalloc for private data

[Gwendal Grignou]

Use dev_kzmalloc, remove .release entry point.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
---
Change sinc v1:
- Readd __remove to avoid a warning when loaded as a module.

 drivers/mfd/cros_ec_dev.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
index 1d6dc5c7a19d..81466264f7fc 100644
--- a/drivers/mfd/cros_ec_dev.c
+++ b/drivers/mfd/cros_ec_dev.c
@@ -262,12 +262,7 @@ static const struct file_operations fops = {
 #endif
 };
 
-static void __remove(struct device *dev)
-{
-	struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev,
-					      class_dev);
-	kfree(ec);
-}
+static void __remove(struct device *dev) { }
 
 static void cros_ec_sensors_register(struct cros_ec_dev *ec)
 {
@@ -392,7 +387,7 @@ static int ec_device_probe(struct platform_device *pdev)
 	int retval = -ENOMEM;
 	struct device *dev = &pdev->dev;
 	struct cros_ec_platform *ec_platform = dev_get_platdata(dev);
-	struct cros_ec_dev *ec = kzalloc(sizeof(*ec), GFP_KERNEL);
+	struct cros_ec_dev *ec = devm_kzalloc(dev, sizeof(*ec), GFP_KERNEL);
 
 	if (!ec)
 		return retval;
@@ -414,7 +409,6 @@ static int ec_device_probe(struct platform_device *pdev)
 	ec->class_dev.devt = MKDEV(ec_major, pdev->id);
 	ec->class_dev.class = &cros_class;
 	ec->class_dev.parent = dev;
-	ec->class_dev.release = __remove;
 
 	retval = dev_set_name(&ec->class_dev, "%s", ec_platform->ec_name);
 	if (retval) {
-- 
2.17.0.921.gf22659ad46-goog

Re: [PATCH v2] platform/chrome: Use to_cros_ec_dev more broadly

[Benson Leung]

[-- Attachment #1: Type: text/plain, Size: 571 bytes --]

Hi Gwendal,

On Wed, May 30, 2018 at 09:04:13AM -0700, Gwendal Grignou wrote:
> Move to_cros_ec_dev macro to cros_ec.h and use it when the private ec
> object is needed from device object.
> 
> Signed-off-by: Gwendal Grignou <gwendal@chromium.org>

Applied to platform/chrome for v4.18.

FYI, Lee, I'll add the new macro in cros_ec.h through my tree. Looks to
merge clean with mfd's changes this time.

Thanks,
Benson

-- 
Benson Leung
Staff Software Engineer
Chrome OS Kernel
Google Inc.
bleung@google.com
Chromium OS Project
bleung@chromium.org

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]

Re: [PATCH v2] cros_ec: Use devm_kzalloc for private data

[Lee Jones]

On Wed, 30 May 2018, Gwendal Grignou wrote:

> Use dev_kzmalloc, remove .release entry point.
> 
> Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
> ---
> Change sinc v1:
> - Readd __remove to avoid a warning when loaded as a module.
> 
>  drivers/mfd/cros_ec_dev.c | 10 ++--------
>  1 file changed, 2 insertions(+), 8 deletions(-)

Applied, thanks.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [PATCH v2] cros_ec: Use devm_kzalloc for private data

[Lee Jones]

On Wed, 30 May 2018, Gwendal Grignou wrote:

> Use dev_kzmalloc, remove .release entry point.
> 
> Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
> ---
> Change sinc v1:
> - Readd __remove to avoid a warning when loaded as a module.
> 
>  drivers/mfd/cros_ec_dev.c | 10 ++--------
>  1 file changed, 2 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
> index 1d6dc5c7a19d..81466264f7fc 100644
> --- a/drivers/mfd/cros_ec_dev.c
> +++ b/drivers/mfd/cros_ec_dev.c
> @@ -262,12 +262,7 @@ static const struct file_operations fops = {
>  #endif
>  };
>  
> -static void __remove(struct device *dev)
> -{
> -	struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev,
> -					      class_dev);
> -	kfree(ec);
> -}
> +static void __remove(struct device *dev) { }

I missed this line when reviewing.

Why are you keeping the function around?

As a result, we now suffer with a build warning:

  drivers/mfd/cros_ec_dev.c:265:13: warning: '__remove' defined but not used [-Wunused-function]
   static void __remove(struct device *dev) { }

Can I just remove the line?  What are the ramifications of doing so?

Please reply swiftly, so resolve this issue in good time.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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