On Tue, 28 Apr 2020, Michal Orzel <michalorzel.eng@xxxxxxxxx> wrote:
> As suggested by the TODO list for the kernel DRM subsystem, replace
> the deprecated functions that take/drop modeset locks with new helpers.
>
> Signed-off-by: Michal Orzel <michalorzel.eng@xxxxxxxxx>
> ---
> drivers/gpu/drm/drm_mode_object.c | 10 ++++++----
> 1 file changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_mode_object.c b/drivers/gpu/drm/drm_mode_object.c
> index 35c2719..901b078 100644
> --- a/drivers/gpu/drm/drm_mode_object.c
> +++ b/drivers/gpu/drm/drm_mode_object.c
> @@ -402,12 +402,13 @@ int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
> {
> struct drm_mode_obj_get_properties *arg = data;
> struct drm_mode_object *obj;
> + struct drm_modeset_acquire_ctx ctx;
> int ret = 0;
>
> if (!drm_core_check_feature(dev, DRIVER_MODESET))
> return -EOPNOTSUPP;
>
> - drm_modeset_lock_all(dev);
> + DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
I cry a little every time I look at the DRM_MODESET_LOCK_ALL_BEGIN and
DRM_MODESET_LOCK_ALL_END macros. :(
Currently only six users... but there are ~60 calls to
drm_modeset_lock_all{,_ctx} that I presume are to be replaced. I wonder
if this will come back and haunt us.
BR,
Jani.
>
> obj = drm_mode_object_find(dev, file_priv, arg->obj_id, arg->obj_type);
> if (!obj) {
> @@ -427,7 +428,7 @@ int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
> out_unref:
> drm_mode_object_put(obj);
> out:
> - drm_modeset_unlock_all(dev);
> + DRM_MODESET_LOCK_ALL_END(ctx, ret);
> return ret;
> }
>
> @@ -449,12 +450,13 @@ static int set_property_legacy(struct drm_mode_object *obj,
> {
> struct drm_device *dev = prop->dev;
> struct drm_mode_object *ref;
> + struct drm_modeset_acquire_ctx ctx;
> int ret = -EINVAL;
>
> if (!drm_property_change_valid_get(prop, prop_value, &ref))
> return -EINVAL;
>
> - drm_modeset_lock_all(dev);
> + DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
> switch (obj->type) {
> case DRM_MODE_OBJECT_CONNECTOR:
> ret = drm_connector_set_obj_prop(obj, prop, prop_value);
> @@ -468,7 +470,7 @@ static int set_property_legacy(struct drm_mode_object *obj,
> break;
> }
> drm_property_change_valid_put(prop, ref);
> - drm_modeset_unlock_all(dev);
> + DRM_MODESET_LOCK_ALL_END(ctx, ret);
>
> return ret;
> }
--
Jani Nikula, Intel Open Source Graphics Center
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