diff options
Diffstat (limited to 'bsd-core')
| -rw-r--r-- | bsd-core/drm_bufs.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/bsd-core/drm_bufs.c b/bsd-core/drm_bufs.c index 0dc923d7..0915da84 100644 --- a/bsd-core/drm_bufs.c +++ b/bsd-core/drm_bufs.c @@ -136,6 +136,16 @@ int DRM(addmap)( DRM_IOCTL_ARGS ) } map->offset = (unsigned long)map->handle; if ( map->flags & _DRM_CONTAINS_LOCK ) { + /* Prevent a 2nd X Server from creating a 2nd lock */ + DRM_LOCK(); + if (dev->lock.hw_lock != NULL) { + DRM_UNLOCK(); + DRM(free)(map->handle, map->size, + DRM_MEM_SAREA); + DRM(free)(map, sizeof(*map), DRM_MEM_MAPS); + return DRM_ERR(EBUSY); + } + DRM_UNLOCK(); dev->lock.hw_lock = map->handle; /* Pointer to lock */ } break; |