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Correct a recursion on non-recursive mutex in drm_addmap from radeon's 

firstopen, by making drm_addmap require the drm device lock to be held.
    Also, make matching of kernel maps match linux by requiring shm matches
    to have the contains_lock flag set if the offset doesn't match.
main
Eric Anholt 2005-11-08 01:12:08 +00:00
parent 3fce085e13
commit 145b23b552
1 changed files with 6 additions and 5 deletions
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11
bsd-core/drm_bufs.c
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@ -127,17 +127,17 @@ int drm_addmap(drm_device_t * dev, unsigned long offset, unsigned long size,
*/
if (type == _DRM_REGISTERS || type == _DRM_FRAME_BUFFER ||
type == _DRM_SHM) {
DRM_LOCK();
TAILQ_FOREACH(map, &dev->maplist, link) {
if (map->type == type &&
(map->offset == offset || map->type == _DRM_SHM)) {
if (map->type == type && (map->offset == offset ||
(map->type == _DRM_SHM &&
map->flags == _DRM_CONTAINS_LOCK))) {
map->size = size;
DRM_DEBUG("Found kernel map %d\n", type);
goto done;
}
}
DRM_UNLOCK();
}
DRM_UNLOCK();
/* Allocate a new map structure, fill it in, and do any type-specific
* initialization necessary.
@ -236,7 +236,6 @@ int drm_addmap(drm_device_t * dev, unsigned long offset, unsigned long size,
done:
/* Jumped to, with lock held, when a kernel map is found. */
DRM_UNLOCK();
DRM_DEBUG("Added map %d 0x%lx/0x%lx\n", map->type, map->offset,
map->size);
@ -261,8 +260,10 @@ int drm_addmap_ioctl(DRM_IOCTL_ARGS)
if (!DRM_SUSER(p) && request.type != _DRM_AGP)
return DRM_ERR(EACCES);
DRM_LOCK();
err = drm_addmap(dev, request.offset, request.size, request.type,
request.flags, &map);
DRM_UNLOCK();
if (err != 0)
return err;