From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
To reduce the number of tracking going on, especially with drivers which
will not support any sort of control from the drm cgroup controller side,
lets express the funcionality as opt-in and use the presence of
drm_cgroup_ops as activation criteria.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
kernel/cgroup/drm.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/kernel/cgroup/drm.c b/kernel/cgroup/drm.c
index 68f31797c4f0..60e1f3861576 100644
--- a/kernel/cgroup/drm.c
+++ b/kernel/cgroup/drm.c
@@ -97,6 +97,9 @@ void drmcgroup_client_open(struct drm_file *file_priv)
{
struct drm_cgroup_state *drmcs;
+ if (!file_priv->minor->dev->driver->cg_ops)
+ return;
+
drmcs = css_to_drmcs(task_get_css(current, drm_cgrp_id));
mutex_lock(&drmcg_mutex);
@@ -112,6 +115,9 @@ void drmcgroup_client_close(struct drm_file *file_priv)
drmcs = css_to_drmcs(file_priv->__css);
+ if (!file_priv->minor->dev->driver->cg_ops)
+ return;
+
mutex_lock(&drmcg_mutex);
list_del(&file_priv->clink);
file_priv->__css = NULL;
@@ -126,6 +132,9 @@ void drmcgroup_client_migrate(struct drm_file *file_priv)
struct drm_cgroup_state *src, *dst;
struct cgroup_subsys_state *old;
+ if (!file_priv->minor->dev->driver->cg_ops)
+ return;
+
mutex_lock(&drmcg_mutex);
old = file_priv->__css;
--
2.39.2
