Re: [Intel-gfx] [PATCH v2 02/12] drm/atomic: Change drm_atomic_helper_swap_state to return an error.

[Daniel Vetter]

On Tue, Jul 11, 2017 at 04:33:04PM +0200, Maarten Lankhorst wrote:
> We want to change swap_state to wait indefinitely, but to do this
> swap_state should wait interruptibly. This requires propagating
> the error to each driver.
> 
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>

Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>

> ---
>  drivers/gpu/drm/drm_atomic_helper.c | 22 ++++++++++++++++------
>  include/drm/drm_atomic_helper.h     |  3 +--
>  2 files changed, 17 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index 667ec97d4efb..bfb98fbd0e0e 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -1510,10 +1510,8 @@ int drm_atomic_helper_commit(struct drm_device *dev,
>  
>  	if (!nonblock) {
>  		ret = drm_atomic_helper_wait_for_fences(dev, state, true);
> -		if (ret) {
> -			drm_atomic_helper_cleanup_planes(dev, state);
> -			return ret;
> -		}
> +		if (ret)
> +			goto err;
>  	}
>  
>  	/*
> @@ -1522,7 +1520,9 @@ int drm_atomic_helper_commit(struct drm_device *dev,
>  	 * the software side now.
>  	 */
>  
> -	drm_atomic_helper_swap_state(state, true);
> +	ret = drm_atomic_helper_swap_state(state, true);
> +	if (ret)
> +		goto err;
>  
>  	/*
>  	 * Everything below can be run asynchronously without the need to grab
> @@ -1551,6 +1551,10 @@ int drm_atomic_helper_commit(struct drm_device *dev,
>  		commit_tail(state);
>  
>  	return 0;
> +
> +err:
> +	drm_atomic_helper_cleanup_planes(dev, state);
> +	return ret;
>  }
>  EXPORT_SYMBOL(drm_atomic_helper_commit);
>  
> @@ -2254,8 +2258,12 @@ EXPORT_SYMBOL(drm_atomic_helper_cleanup_planes);
>   * the &drm_plane.state, &drm_crtc.state or &drm_connector.state pointer. With
>   * the current atomic helpers this is almost always the case, since the helpers
>   * don't pass the right state structures to the callbacks.
> + *
> + * Returns:
> + *
> + * Always returns 0, cannot fail yet.
>   */
> -void drm_atomic_helper_swap_state(struct drm_atomic_state *state,
> +int drm_atomic_helper_swap_state(struct drm_atomic_state *state,
>  				  bool stall)
>  {
>  	int i;
> @@ -2332,6 +2340,8 @@ void drm_atomic_helper_swap_state(struct drm_atomic_state *state,
>  
>  	__for_each_private_obj(state, obj, obj_state, i, funcs)
>  		funcs->swap_state(obj, &state->private_objs[i].obj_state);
> +
> +	return 0;
>  }
>  EXPORT_SYMBOL(drm_atomic_helper_swap_state);
>  
> diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
> index dd196cc0afd7..37c9534ff691 100644
> --- a/include/drm/drm_atomic_helper.h
> +++ b/include/drm/drm_atomic_helper.h
> @@ -84,8 +84,7 @@ void
>  drm_atomic_helper_disable_planes_on_crtc(struct drm_crtc_state *old_crtc_state,
>  					 bool atomic);
>  
> -void drm_atomic_helper_swap_state(struct drm_atomic_state *state,
> -				  bool stall);
> +int drm_atomic_helper_swap_state(struct drm_atomic_state *state, bool stall);
>  
>  /* nonblocking commit helpers */
>  int drm_atomic_helper_setup_commit(struct drm_atomic_state *state,
> -- 
> 2.11.0
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch