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drm/lease: look at ->universal_planes only once

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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).

v3: Actually add everything ... silly me.

Cc: Keith Packard <keithp@keithp.com>
Cc: Dave Airlie <airlied@gmail.com>
Acked-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181105101211.22737-1-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2018-11-05 11:12:11 +01:00
parent 078b7de412
commit 9680290571
1 changed files with 8 additions and 6 deletions
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14
drivers/gpu/drm/drm_lease.c
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@ -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 +423,7 @@ static int fill_object_idr(struct drm_device *dev,
}
}
ret = validate_lease(dev, lessor_priv, object_count, objects);
ret = validate_lease(dev, object_count, objects, universal_planes);
if (ret) {
DRM_DEBUG_LEASE("lease validation failed\n");
goto out_free_objects;
@ -448,7 +450,7 @@ 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) {