On Wed, Jun 28, 2017 at 03:28:12PM +0200, Maarten Lankhorst wrote:
> Without waiting for hw_done, previous atomic updates may dereference
> the wrong state and cause a lot of confusion. The real fix is fixing
> all obj->state to use the accessor macros, but for now wait
> indefinitely and interruptibly.
> 
> Cc: Boris Brezillon <boris.brezil...@free-electrons.com>
> Cc: David Airlie <airl...@linux.ie>
> Cc: Daniel Vetter <daniel.vet...@intel.com>
> Cc: Jani Nikula <jani.nik...@linux.intel.com>
> Cc: Sean Paul <seanp...@chromium.org>
> Cc: CK Hu <ck...@mediatek.com>
> Cc: Philipp Zabel <p.za...@pengutronix.de>
> Cc: Matthias Brugger <matthias....@gmail.com>
> Cc: Rob Clark <robdcl...@gmail.com>
> Cc: Ben Skeggs <bske...@redhat.com>
> Cc: Thierry Reding <thierry.red...@gmail.com>
> Cc: Jonathan Hunter <jonath...@nvidia.com>
> Cc: Jyri Sarha <jsa...@ti.com>
> Cc: Tomi Valkeinen <tomi.valkei...@ti.com>
> Cc: Eric Anholt <e...@anholt.net>
> Cc: dri-de...@lists.freedesktop.org
> Cc: linux-ker...@vger.kernel.org
> Cc: intel-...@lists.freedesktop.org
> Cc: linux-arm-ker...@lists.infradead.org
> Cc: linux-media...@lists.infradead.org
> Cc: linux-arm-...@vger.kernel.org
> Cc: freedreno@lists.freedesktop.org
> Cc: nouv...@lists.freedesktop.org
> Cc: linux-te...@vger.kernel.org
> Signed-off-by: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
> ---
>  drivers/gpu/drm/drm_atomic_helper.c | 12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c 
> b/drivers/gpu/drm/drm_atomic_helper.c
> index f66b6c45cdd0..56e7729d993d 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -2144,8 +2144,7 @@ EXPORT_SYMBOL(drm_atomic_helper_cleanup_planes);
>  int drm_atomic_helper_swap_state(struct drm_atomic_state *state,
>                                 bool stall)

Needs improved kernel-doc:

 * Returns:
 * 
 * 0 on success. Can return -EINTR when @stall is true and the waiting for
 * the previous commits has been interrupted.

With that Reviewed-by: Daniel Vetter <daniel.vet...@ffwll.ch>

>  {
> -     int i;
> -     long ret;
> +     int i, ret;
>       struct drm_connector *connector;
>       struct drm_connector_state *old_conn_state, *new_conn_state;
>       struct drm_crtc *crtc;
> @@ -2168,12 +2167,11 @@ int drm_atomic_helper_swap_state(struct 
> drm_atomic_state *state,
>                       if (!commit)
>                               continue;
>  
> -                     ret = wait_for_completion_timeout(&commit->hw_done,
> -                                                       10*HZ);
> -                     if (ret == 0)
> -                             DRM_ERROR("[CRTC:%d:%s] hw_done timed out\n",
> -                                       crtc->base.id, crtc->name);
> +                     ret = 
> wait_for_completion_interruptible(&commit->hw_done);
>                       drm_crtc_commit_put(commit);
> +
> +                     if (ret)
> +                             return ret;
>               }
>       }
>  
> -- 
> 2.11.0
> 
> _______________________________________________
> dri-devel mailing list
> dri-de...@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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