On Wed, May 04, 2016 at 06:03:05AM +1000, Dave Airlie wrote:
> From: Dave Airlie <airlied@xxxxxxxxxx>
>
> Take a reference when setting a crtc on a connecter,
> also take one when duplicating if a crtc is set,
> and drop one on destroy if a crtc is set.
>
> v2: take Daniel Stone's advice and simplify the
> ref/unref dances, also take care of NULL as connector
> to state reset.
>
> v3: remove need for connector NULL check.
>
> Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
This patch series seems cursed with lots of embarrassement for reviewers.
I totally missed/forgot the FIXME in drm_atomic_state_default_clear(),
which this patch fixes. Anyway, I'm happy to burn my hands again ;-)
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> ---
> drivers/gpu/drm/drm_atomic.c | 14 +++++---------
> drivers/gpu/drm/drm_atomic_helper.c | 4 ++++
> 2 files changed, 9 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index 9d5e3c8..0df87a5 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -142,15 +142,7 @@ void drm_atomic_state_default_clear(struct drm_atomic_state *state)
> if (!connector)
> continue;
>
> - /*
> - * FIXME: Async commits can race with connector unplugging and
> - * there's currently nothing that prevents cleanup up state for
> - * deleted connectors. As long as the callback doesn't look at
> - * the connector we'll be fine though, so make sure that's the
> - * case by setting all connector pointers to NULL.
> - */
> - state->connector_states[i]->connector = NULL;
> - connector->funcs->atomic_destroy_state(NULL,
> + connector->funcs->atomic_destroy_state(connector,
> state->connector_states[i]);
> state->connectors[i] = NULL;
> state->connector_states[i] = NULL;
> @@ -1160,6 +1152,8 @@ drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
> {
> struct drm_crtc_state *crtc_state;
>
> + if (crtc)
> + drm_connector_reference(conn_state->connector);
> if (conn_state->crtc && conn_state->crtc != crtc) {
> crtc_state = drm_atomic_get_existing_crtc_state(conn_state->state,
> conn_state->crtc);
> @@ -1177,6 +1171,8 @@ drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
> 1 << drm_connector_index(conn_state->connector);
> }
>
> + if (conn_state->crtc)
> + drm_connector_unreference(conn_state->connector);
> conn_state->crtc = crtc;
>
> if (crtc)
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index d25abce..c48446d 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -2762,6 +2762,8 @@ __drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector,
> struct drm_connector_state *state)
> {
> memcpy(state, connector->state, sizeof(*state));
> + if (state->crtc)
> + drm_connector_reference(connector);
> }
> EXPORT_SYMBOL(__drm_atomic_helper_connector_duplicate_state);
>
> @@ -2889,6 +2891,8 @@ __drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
> * state will automatically do the right thing if code is ever added
> * to this function.
> */
> + if (state->crtc)
> + drm_connector_unreference(state->connector);
> }
> EXPORT_SYMBOL(__drm_atomic_helper_connector_destroy_state);
>
> --
> 2.5.5
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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