Author: mav
Date: Fri Dec 2 17:09:48 2011
New Revision: 228204
URL: http://svn.freebsd.org/changeset/base/228204
Log:
Close race between geom destruction on g_vfs_close() when softc destroyed
and g_vfs_orphan() call that tries to access softc, intruced at r227015.
PR: kern/162997
Modified:
head/sys/geom/geom_vfs.c
Modified: head/sys/geom/geom_vfs.c
==============================================================================
--- head/sys/geom/geom_vfs.c Fri Dec 2 15:47:05 2011 (r228203)
+++ head/sys/geom/geom_vfs.c Fri Dec 2 17:09:48 2011 (r228204)
@@ -169,8 +169,10 @@ g_vfs_orphan(struct g_consumer *cp)
g_topology_assert();
gp = cp->geom;
- sc = gp->softc;
g_trace(G_T_TOPOLOGY, "g_vfs_orphan(%p(%s))", cp, gp->name);
+ sc = gp->softc;
+ if (sc == NULL)
+ return;
mtx_lock(&sc->sc_mtx);
sc->sc_orphaned = 1;
destroy = (sc->sc_active == 0);
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