[RFC 1/2] drm: add devm release action

[Aravind Iddamsetty]

On 21/03/24 12:17, Jani Nikula wrote:
> On Thu, 21 Mar 2024, Aravind Iddamsetty <aravind.iddamsetty at linux.intel.com> wrote:
>> On 21/03/24 02:23, Rodrigo Vivi wrote:
>>> On Wed, Mar 20, 2024 at 04:14:25PM +0530, Aravind Iddamsetty wrote:
>>>> In scenarios where drm_dev_put is directly called by driver we want to
>>>> release devm_drm_dev_init_release action associated with struct
>>>> drm_device.
>>>>
>>>> Cc: Thomas Hellstr_m <thomas.hellstrom at linux.intel.com>
>>>>
>>>> Signed-off-by: Aravind Iddamsetty <aravind.iddamsetty at linux.intel.com>
>>>> ---
>>>>  drivers/gpu/drm/drm_drv.c | 6 ++++++
>>>>  include/drm/drm_drv.h     | 4 ++++
>>>>  2 files changed, 10 insertions(+)
>>>>
>>>> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
>>>> index 243cacb3575c..b23c5081812b 100644
>>>> --- a/drivers/gpu/drm/drm_drv.c
>>>> +++ b/drivers/gpu/drm/drm_drv.c
>>>> @@ -714,6 +714,12 @@ static int devm_drm_dev_init(struct device *parent,
>>>>  					devm_drm_dev_init_release, dev);
>>>>  }
>>>>  
>>>> +void __devm_drm_dev_release_action(struct drm_device *dev)
>>>> +{
>>>> +	devm_release_action(dev->dev, devm_drm_dev_init_release, dev);
>>>> +}
>>>> +EXPORT_SYMBOL(__devm_drm_dev_release_action);
>>>> +
>>>>  void *__devm_drm_dev_alloc(struct device *parent,
>>>>  			   const struct drm_driver *driver,
>>>>  			   size_t size, size_t offset)
>>>> diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
>>>> index 8878260d7529..a1d12cb72088 100644
>>>> --- a/include/drm/drm_drv.h
>>>> +++ b/include/drm/drm_drv.h
>>>> @@ -444,6 +444,8 @@ struct drm_driver {
>>>>  	const struct file_operations *fops;
>>>>  };
>>>>  
>>>> +void __devm_drm_dev_release_action(struct drm_device *dev);
>>>> +
>>>>  void *__devm_drm_dev_alloc(struct device *parent,
>>>>  			   const struct drm_driver *driver,
>>>>  			   size_t size, size_t offset);
>>>> @@ -477,6 +479,8 @@ void *__devm_drm_dev_alloc(struct device *parent,
>>>>  #define devm_drm_dev_alloc(parent, driver, type, member) \
>>>>  	((type *) __devm_drm_dev_alloc(parent, driver, sizeof(type), \
>>>>  				       offsetof(type, member)))
>>>> +#define devm_drm_release_action(drm_dev) \
>>>> +	__devm_drm_dev_release_action(drm_dev)
>>> why not simply renaming the original function?
>> didn't get you which function are you referring to?
> Why add a function with double-underscores, and then wrap it in a macro
> without the underscores?
>
> devm_drm_dev_alloc() is that way only because it needs sizeof and
> offsetof on the arguments, not to set a general example.

Oh ok got it Rodrigo was referring to _devm_drm_dev_release_action.

right, I took the reference of devm_drm_dev_alloc, thanks for the explanation
will change it.
Regards,
Aravind.
>
> BR,
> Jani.
>
>> Thanks,
>> Aravind.
>>>>  
>>>>  struct drm_device *drm_dev_alloc(const struct drm_driver *driver,
>>>>  				 struct device *parent);
>>>> -- 
>>>> 2.25.1
>>>>
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