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drm/atomic: Check for busy planes/connectors before setting the commit

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We still want to fail with -EBUSY if a plane or connector is part of
a commit, even if it will be assigned to a new commit.

This closes a small hole left open where we should return -EBUSY.
It's not severe, because wait_for_dependencies and swap_state helpers
still block. But it should return -EBUSY and not stall.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Fixes: 21a01abbe3 ("drm/atomic: Fix freeing connector/plane state too early by tracking commits, v3.")
Link: https://patchwork.freedesktop.org/patch/msgid/20171016132928.6498-2-maarten.lankhorst@linux.intel.com
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
This commit is contained in:
Maarten Lankhorst 2017-10-16 15:29:28 +02:00
parent 4edd608472
commit 080de2e5be
1 changed files with 8 additions and 9 deletions
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17
drivers/gpu/drm/drm_atomic_helper.c
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@ -1772,16 +1772,16 @@ int drm_atomic_helper_setup_commit(struct drm_atomic_state *state,
}
for_each_oldnew_connector_in_state(state, conn, old_conn_state, new_conn_state, i) {
/* commit tracked through new_crtc_state->commit, no need to do it explicitly */
if (new_conn_state->crtc)
continue;
/* Userspace is not allowed to get ahead of the previous
* commit with nonblocking ones. */
if (nonblock && old_conn_state->commit &&
!try_wait_for_completion(&old_conn_state->commit->flip_done))
return -EBUSY;
/* commit tracked through new_crtc_state->commit, no need to do it explicitly */
if (new_conn_state->crtc)
continue;
commit = crtc_or_fake_commit(state, old_conn_state->crtc);
if (!commit)
return -ENOMEM;
@ -1790,17 +1790,16 @@ int drm_atomic_helper_setup_commit(struct drm_atomic_state *state,
}
for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
/*
* Unlike connectors, always track planes explicitly for
* async pageflip support.
*/
/* Userspace is not allowed to get ahead of the previous
* commit with nonblocking ones. */
if (nonblock && old_plane_state->commit &&
!try_wait_for_completion(&old_plane_state->commit->flip_done))
return -EBUSY;
/*
* Unlike connectors, always track planes explicitly for
* async pageflip support.
*/
commit = crtc_or_fake_commit(state, new_plane_state->crtc ?: old_plane_state->crtc);
if (!commit)
return -ENOMEM;