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drm/atomic: Check old_plane_state->crtc in drm_atomic_helper_async_check()

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Async plane update is supposed to work only when updating the FB or FB
position of an already enabled plane. That does not apply to requests
where the plane was previously disabled or assigned to a different
CTRC.

Check old_plane_state->crtc value to make sure async plane update is
allowed.

Fixes: fef9df8b5945 ("drm/atomic: initial support for asynchronous plane update")
Cc: <stable@vger.kernel.org>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20180724133215.31917-1-boris.brezillon@bootlin.com
This commit is contained in:
Boris Brezillon 2018-07-24 15:32:15 +02:00
parent d530b5f1ca
commit 603ba2dfb3
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/drm_atomic_helper.c
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@ -1527,7 +1527,8 @@ int drm_atomic_helper_async_check(struct drm_device *dev,
if (n_planes != 1)
return -EINVAL;
if (!new_plane_state->crtc)
if (!new_plane_state->crtc ||
old_plane_state->crtc != new_plane_state->crtc)
return -EINVAL;
funcs = plane->helper_private;