Re: [PATCH] drm/atomic: cleanup debugfs entries on un-registering the driver.

[Brian Starkey]

On Thu, Nov 17, 2016 at 11:41:29AM +0000, Liviu Dudau wrote:
> Cleanup the debugfs entries created by commit 6559c901cb48 when
> the driver's minor gets un-registered. Without it, DRM drivers
> compiled as modules cannot be rmmod-ed and modprobed again.
>
> Signed-off-by: Liviu Dudau <Liviu.Dudau@xxxxxxx>

Works for me,

Tested-by: Brian Starkey <brian.starkey@xxxxxxx>

> ---
> drivers/gpu/drm/drm_atomic.c  | 7 +++++++
> drivers/gpu/drm/drm_debugfs.c | 9 +++++++++
> include/drm/drm_atomic.h      | 1 +
> 3 files changed, 17 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index 6773b35..dddf37a 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -1681,6 +1681,13 @@ int drm_atomic_debugfs_init(struct drm_minor *minor)
> 			ARRAY_SIZE(drm_atomic_debugfs_list),
> 			minor->debugfs_root, minor);
> }
> +
> +int drm_atomic_debugfs_cleanup(struct drm_minor *minor)
> +{
> +	return drm_debugfs_remove_files(drm_atomic_debugfs_list,
> +					ARRAY_SIZE(drm_atomic_debugfs_list),
> +					minor);
> +}
> #endif
>
> /*
> diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
> index 206a4fe..2e3e46a 100644
> --- a/drivers/gpu/drm/drm_debugfs.c
> +++ b/drivers/gpu/drm/drm_debugfs.c
> @@ -228,6 +228,7 @@ EXPORT_SYMBOL(drm_debugfs_remove_files);
> int drm_debugfs_cleanup(struct drm_minor *minor)
> {
> 	struct drm_device *dev = minor->dev;
> +	int ret;
>
> 	if (!minor->debugfs_root)
> 		return 0;
> @@ -235,6 +236,14 @@ int drm_debugfs_cleanup(struct drm_minor *minor)
> 	if (dev->driver->debugfs_cleanup)
> 		dev->driver->debugfs_cleanup(minor);
>
> +	if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
> +		ret = drm_atomic_debugfs_cleanup(minor);
> +		if (ret) {
> +			DRM_ERROR("DRM: Failed to remove atomic debugfs entries\n");
> +			return ret;
> +		}
> +	}
> +
> 	drm_debugfs_remove_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES, minor);
>
> 	debugfs_remove(minor->debugfs_root);
> diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
> index 2409144..6400df0 100644
> --- a/include/drm/drm_atomic.h
> +++ b/include/drm/drm_atomic.h
> @@ -374,6 +374,7 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
> #ifdef CONFIG_DEBUG_FS
> struct drm_minor;
> int drm_atomic_debugfs_init(struct drm_minor *minor);
> +int drm_atomic_debugfs_cleanup(struct drm_minor *minor);
> #endif
>
> #define for_each_connector_in_state(__state, connector, connector_state, __i) \
> --
> 2.10.0