From e9b5dc16ef2018814e69d9969a8b7ed3fd9e5aa6 Mon Sep 17 00:00:00 2001
From: Joseph Koshy <jkoshy@FreeBSD.org>
Date: Tue, 29 Dec 2009 02:35:50 +0000
Subject: [PATCH] Use VFS_{LOCK,UNLOCK}_GIANT() around the call to vrele().
Reviewed by: kib
---
sys/dev/hwpmc/hwpmc_mod.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/sys/dev/hwpmc/hwpmc_mod.c b/sys/dev/hwpmc/hwpmc_mod.c
index 6c7c587cb435..d331a85eafdd 100644
--- a/sys/dev/hwpmc/hwpmc_mod.c
+++ b/sys/dev/hwpmc/hwpmc_mod.c
@@ -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_owner *po, struct proc *p)
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)