drm/exynos: fix pending update handling

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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@samsung.com>
Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

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Andrzej Hajda 2016-09-26 16:50:21 +09:00 • committed by Inki Dae

parent 8574e927b4

commit 14e022f304

3 changed files with 2 additions and 60 deletions

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16

drivers/gpu/drm/exynos/exynos_drm_crtc.c

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44

drivers/gpu/drm/exynos/exynos_drm_drv.c

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2

drivers/gpu/drm/exynos/exynos_drm_drv.h

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