It's lockless, and userspace might chance it underneath us. That's not
really a problem, all userspace gets is a slightly dysfunctional
lease with the current code. But this might change, and gcc might
decide to reload a few too many times, and then boom. So better safe
than sorry.
v2: Remove the now unused lessor_priv argument from validate_lease()
(Keith).
Cc: Keith Packard <keithp@xxxxxxxxxx>
Cc: Dave Airlie <airlied@xxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
---
drivers/gpu/drm/drm_lease.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/drm_lease.c b/drivers/gpu/drm/drm_lease.c
index 3b0342a45ae9..739d3830173f 100644
--- a/drivers/gpu/drm/drm_lease.c
+++ b/drivers/gpu/drm/drm_lease.c
@@ -353,9 +353,9 @@ void drm_lease_revoke(struct drm_master *top)
}
static int validate_lease(struct drm_device *dev,
- struct drm_file *lessor_priv,
int object_count,
- struct drm_mode_object **objects)
+ struct drm_mode_object **objects,
+ bool universal_planes)
{
int o;
int has_crtc = -1;
@@ -372,14 +372,14 @@ static int validate_lease(struct drm_device *dev,
if (objects[o]->type == DRM_MODE_OBJECT_CONNECTOR && has_connector == -1)
has_connector = o;
- if (lessor_priv->universal_planes) {
+ if (universal_planes) {
if (objects[o]->type == DRM_MODE_OBJECT_PLANE && has_plane == -1)
has_plane = o;
}
}
if (has_crtc == -1 || has_connector == -1)
return -EINVAL;
- if (lessor_priv->universal_planes && has_plane == -1)
+ if (universal_planes && has_plane == -1)
return -EINVAL;
return 0;
}
@@ -393,6 +393,8 @@ static int fill_object_idr(struct drm_device *dev,
struct drm_mode_object **objects;
u32 o;
int ret;
+ bool universal_planes = READ_ONCE(lessor_priv->universal_planes);
+
objects = kcalloc(object_count, sizeof(struct drm_mode_object *),
GFP_KERNEL);
if (!objects)
@@ -421,7 +423,8 @@ static int fill_object_idr(struct drm_device *dev,
}
}
- ret = validate_lease(dev, lessor_priv, object_count, objects);
+ ret = validate_lease(dev, lessor_priv, object_count, objects,
+ universal_planes);
if (ret) {
DRM_DEBUG_LEASE("lease validation failed\n");
goto out_free_objects;
@@ -448,7 +451,7 @@ static int fill_object_idr(struct drm_device *dev,
object_id, ret);
goto out_free_objects;
}
- if (obj->type == DRM_MODE_OBJECT_CRTC && !lessor_priv->universal_planes) {
+ if (obj->type == DRM_MODE_OBJECT_CRTC && !universal_planes) {
struct drm_crtc *crtc = obj_to_crtc(obj);
ret = idr_alloc(leases, &drm_lease_idr_object, crtc->primary->base.id, crtc->primary->base.id + 1, GFP_KERNEL);
if (ret < 0) {
--
2.14.4
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