[PATCH 2/2] drm/exynos: fix pending update handling

[Gustavo Padovan]

2016-09-23 Andrzej Hajda <a.hajda at samsung.com>:

> Exynos DRM devices update their registers at vblank time. Exynos-DRM uses
> custom mechanism to wait for vblank. This mechanism is error prone -
> variables are not updated atomically. As a result in certain circumstances
> user space can try to free buffers which are still in use by hardware,
> in such cases IOMMU can throw OOPS.
> The patch instead of fixing the mechanism replaces it with drm core helper.
> 
> Signed-off-by: Andrzej Hajda <a.hajda at samsung.com>
> ---
>  drivers/gpu/drm/exynos/exynos_drm_crtc.c | 16 +-----------
>  drivers/gpu/drm/exynos/exynos_drm_drv.c  | 44 +-------------------------------
>  drivers/gpu/drm/exynos/exynos_drm_drv.h  |  2 --
>  3 files changed, 2 insertions(+), 60 deletions(-)

Reviewed-by: Gustavo Padovan <gustavo.padovan at collabora.co.uk>

Gustavo