From c93a1be72bccb1fe439910ab62060fbd513b94c2 Mon Sep 17 00:00:00 2001
From: alfred <alfred@FreeBSD.org>
Date: Wed, 23 May 2001 22:17:28 +0000
Subject: pmap_mapdev needs the vm_mtx, aquire it if not already locked

---
 sys/amd64/amd64/pmap.c | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'sys/amd64')

diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
index fd4fed3..c6db00b 100644
--- a/sys/amd64/amd64/pmap.c
+++ b/sys/amd64/amd64/pmap.c
@@ -3135,10 +3135,15 @@ pmap_mapdev(pa, size)
 {
 	vm_offset_t va, tmpva, offset;
 	unsigned *pte;
+	int hadvmlock;
 
 	offset = pa & PAGE_MASK;
 	size = roundup(offset + size, PAGE_SIZE);
 
+	hadvmlock = mtx_owned(&vm_mtx);
+	if (!hadvmlock)
+		mtx_lock(&vm_mtx);
+
 	va = kmem_alloc_pageable(kernel_map, size);
 	if (!va)
 		panic("pmap_mapdev: Couldn't alloc kernel virtual memory");
@@ -3153,6 +3158,9 @@ pmap_mapdev(pa, size)
 	}
 	invltlb();
 
+	if (!hadvmlock)
+		mtx_unlock(&vm_mtx);
+
 	return ((void *)(va + offset));
 }
 
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