drm/doc: Repleace LOCKING kerneldoc sections in drm_modes.c

There's not really any value in stating that no locking is needed. And
even if the comment is useful, a check for the right mutex at the
beginning of the function is better since that can't be ingored as
easily as a bit of documentation.

Note that drm_mode_probed_add in drm_crtc.c is also changed, the next
patch will move this into drm_modes.c

v2: Don't add locking WARN_ONs where it is not strictly required (i.e.
the two functions to validate/prune mode lists).

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index ea620f4cf6c7..353ff6398c36 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -730,6 +730,8 @@ EXPORT_SYMBOL(drm_crtc_index);
 void drm_mode_probed_add(struct drm_connector *connector,
                          struct drm_display_mode *mode)
 {
+        WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
+
         list_add_tail(&mode->head, &connector->probed_modes);
 }
 EXPORT_SYMBOL(drm_mode_probed_add);