[PATCH 3/5] drm/atomic: Convert pageflip ioctl locking to interruptible.

[Daniel Vetter]

On Thu, Jul 27, 2017 at 02:58:38PM +0200, Maarten Lankhorst wrote:
> Pass DRM_MODESET_ACQUIRE_INTERRUPTIBLE to acquire_init, and handle
> drm_modeset_backoff which can now fail by returning the error.
> 
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>

Same comment as the atomic ioctl. With the testcase added this gets my

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---
>  drivers/gpu/drm/drm_plane.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
> index 5dc8c4350602..4997229d397b 100644
> --- a/drivers/gpu/drm/drm_plane.c
> +++ b/drivers/gpu/drm/drm_plane.c
> @@ -866,7 +866,7 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
>  		return -EINVAL;
>  	}
>  
> -	drm_modeset_acquire_init(&ctx, 0);
> +	drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
>  retry:
>  	ret = drm_modeset_lock(&crtc->mutex, &ctx);
>  	if (ret)
> @@ -955,8 +955,9 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
>  	crtc->primary->old_fb = NULL;
>  
>  	if (ret == -EDEADLK) {
> -		drm_modeset_backoff(&ctx);
> -		goto retry;
> +		ret = drm_modeset_backoff(&ctx);
> +		if (!ret)
> +			goto retry;
>  	}
>  
>  	drm_modeset_drop_locks(&ctx);
> -- 
> 2.11.0
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch