Op 30-07-18 om 08:14 schreef Satendra Singh Thakur:
> a. Used drm_atomic_get_crtc_state instead of drm_atomic_get_new_crtc_state.
> Anyway new_state and state are same, this should make no difference.
> This change will make the code of this func and the func
> drm_atomic_set_crtc_for_plane similar.
> b. Added error checking after this func call
> c. Currently conn_state->crtc is getting assigned a value at two places
> We can just reduce this assignment to one
>
> Signed-off-by: Satendra Singh Thakur <satendra.t@xxxxxxxxxxx>
> ---
> drivers/gpu/drm/drm_atomic.c | 9 ++++-----
> 1 file changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index 895741e..907fb2d 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -1552,16 +1552,16 @@ drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
> return 0;
>
> if (conn_state->crtc) {
> - crtc_state = drm_atomic_get_new_crtc_state(conn_state->state,
> + crtc_state = drm_atomic_get_crtc_state(conn_state->state,
> conn_state->crtc);
> + if (IS_ERR(crtc_state))
> + return PTR_ERR(crtc_state);
The error checking is not required when using drm_atomic_get_new_crtc_state,
because the end of drm_atomic_get_connector_state() will fetch it for us.
The other place where conn_state->crtc is assigned is in drm_atomic_set_crtc_for_connector(),
which also makes sure we have the crtc_state part of the commit.
It would be a bug if we would have a conn_state without conn_state->crtc's state.
Did you hit a crash here?
> crtc_state->connector_mask &=
> ~(1 << drm_connector_index(conn_state->connector));
>
> drm_connector_put(conn_state->connector);
> - conn_state->crtc = NULL;
> }
> -
> if (crtc) {
> crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc);
> if (IS_ERR(crtc_state))
> @@ -1571,7 +1571,6 @@ drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
> 1 << drm_connector_index(conn_state->connector);
>
> drm_connector_get(conn_state->connector);
> - conn_state->crtc = crtc;
>
> DRM_DEBUG_ATOMIC("Link connector state %p to [CRTC:%d:%s]\n",
> conn_state, crtc->base.id, crtc->name);
> @@ -1579,7 +1578,7 @@ drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
> DRM_DEBUG_ATOMIC("Link connector state %p to [NOCRTC]\n",
> conn_state);
> }
> -
> + conn_state->crtc = crtc;
> return 0;
> }
> EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
~Maarten
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