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drm: Reject DRI1 hw lock ioctl functions for kms drivers

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I've done some extensive history digging across libdrm, mesa and
xf86-video-{intel,nouveau,ati}. The only potential user of this with
kms drivers I could find was ttmtest, which once used drmGetLock
still. But that mistake was quickly fixed up. Even the intel xvmc
library (which otherwise was really good with using dri1 stuff in kms
mode) managed to never take the hw lock for dri2 (and hence kms).

Hence it should be save to unconditionally disallow this.

Cc: Peter Antoine <peter.antoine@intel.com>
Reviewed-by: Peter Antoine <peter.antoine@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
This commit is contained in:
Daniel Vetter 2015-06-23 11:34:21 +02:00
parent ba6976c129
commit da168d81b4
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/drm_lock.c
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@ -61,6 +61,9 @@ int drm_legacy_lock(struct drm_device *dev, void *data,
struct drm_master *master = file_priv->master;
int ret = 0;
if (drm_core_check_feature(dev, DRIVER_MODESET))
return -EINVAL;
++file_priv->lock_count;
if (lock->context == DRM_KERNEL_CONTEXT) {
@ -153,6 +156,9 @@ int drm_legacy_unlock(struct drm_device *dev, void *data, struct drm_file *file_
struct drm_lock *lock = data;
struct drm_master *master = file_priv->master;
if (drm_core_check_feature(dev, DRIVER_MODESET))
return -EINVAL;
if (lock->context == DRM_KERNEL_CONTEXT) {
DRM_ERROR("Process %d using kernel context %d\n",
task_pid_nr(current), lock->context);