On Wed, Apr 29, 2020 at 4:57 AM Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx> wrote:
>
> 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.
>
What's the alternative? Seems like the options without the macros is
to use incorrect scope or have a bunch of retry/backoff cargo-cult
everywhere (and hope the copy source is done correctly).
Sean
> 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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