From 1f7598245af7e73b34130a44fbaac230e29d7aad Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Thu, 6 Nov 2003 04:48:06 +0000 Subject: Return EBUSY when attempting to addmap a DRM_SHM area with a lock in it if dev->lock.hw_lock is already set. This fixes the case of two X Servers running on the same head on different VTs with interface 1.1, by making the 2nd head fail to inizialize like before. --- linux-core/drm_bufs.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'linux-core/drm_bufs.c') diff --git a/linux-core/drm_bufs.c b/linux-core/drm_bufs.c index 77573709..e30e6de8 100644 --- a/linux-core/drm_bufs.c +++ b/linux-core/drm_bufs.c @@ -161,6 +161,12 @@ int DRM(addmap)( struct inode *inode, struct file *filp, } map->offset = (unsigned long)map->handle; if ( map->flags & _DRM_CONTAINS_LOCK ) { + /* Prevent a 2nd X Server from creating a 2nd lock */ + if (dev->lock.hw_lock != NULL) { + vfree( map->handle ); + DRM(free)( map, sizeof(*map), DRM_MEM_MAPS ); + return -EBUSY; + } dev->sigdata.lock = dev->lock.hw_lock = map->handle; /* Pointer to lock */ } -- cgit v1.2.3