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From: Fabien Thomas <fabient@FreeBSD.org>
Date: Sun, 10 Jan 2010 16:08:14 +0000 (UTC)
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Subject: svn commit: r202012 - stable/8/sys/dev/hwpmc
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Author: fabient
Date: Sun Jan 10 16:08:14 2010
New Revision: 202012
URL: http://svn.freebsd.org/changeset/base/202012

Log:
  MFC 201151:
   Use VFS_{LOCK,UNLOCK}_GIANT() around the call to vrele().

Modified:
  stable/8/sys/dev/hwpmc/hwpmc_mod.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)
  stable/8/sys/dev/xen/xenpci/   (props changed)

Modified: stable/8/sys/dev/hwpmc/hwpmc_mod.c
==============================================================================
--- stable/8/sys/dev/hwpmc/hwpmc_mod.c	Sun Jan 10 16:05:05 2010	(r202011)
+++ stable/8/sys/dev/hwpmc/hwpmc_mod.c	Sun Jan 10 16:08:14 2010	(r202012)
@@ -41,6 +41,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/lock.h>
 #include <sys/malloc.h>
 #include <sys/module.h>
+#include <sys/mount.h>
 #include <sys/mutex.h>
 #include <sys/pmc.h>
 #include <sys/pmckern.h>
@@ -1625,6 +1626,7 @@ pmc_log_kernel_mappings(struct pmc *pm)
 static void
 pmc_log_process_mappings(struct pmc_owner *po, struct proc *p)
 {
+	int locked;
 	vm_map_t map;
 	struct vnode *vp;
 	struct vmspace *vm;
@@ -1733,7 +1735,11 @@ pmc_log_process_mappings(struct pmc_owne
 		freepath = NULL;
 		pmc_getfilename(vp, &fullpath, &freepath);
 		last_vp = vp;
+
+		locked = VFS_LOCK_GIANT(vp->v_mount);
 		vrele(vp);
+		VFS_UNLOCK_GIANT(locked);
+
 		vp = NULL;
 		pmclog_process_map_in(po, p->p_pid, start_addr, fullpath);
 		if (freepath)