From: Maarten Lankhorst Date: Mon, 16 Oct 2017 13:29:28 +0000 (+0200) Subject: drm/atomic: Check for busy planes/connectors before setting the commit X-Git-Tag: v4.15-rc1~19^2~34^2~25 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=080de2e5be2d4b396b6792cde4cb2048fcdb4ce9;p=linux-2.6-block.git drm/atomic: Check for busy planes/connectors before setting the commit 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 Fixes: 21a01abbe32a ("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 --- diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index aec73f4c70c6..3472d9ae8b95 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -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;