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In pmap_page_protect(), don't reference a pmap we're unlocking via

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the PV entry we just freed (D'OH!)
This commit is contained in:
thorpej 1999-12-02 23:40:27 +00:00
parent a00a9ff012
commit d89260177d
1 changed files with 8 additions and 5 deletions
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13
sys/arch/alpha/alpha/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.121 1999/12/02 01:09:11 thorpej Exp $ */
/* $NetBSD: pmap.c,v 1.122 1999/12/02 23:40:27 thorpej Exp $ */
/*-
* Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
@ -154,7 +154,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.121 1999/12/02 01:09:11 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.122 1999/12/02 23:40:27 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -1432,6 +1432,7 @@ pmap_page_protect(pg, prot)
struct vm_page *pg;
vm_prot_t prot;
{
pmap_t pmap;
struct pv_head *pvh;
pv_entry_t pv, nextpv;
boolean_t needisync = FALSE;
@ -1477,14 +1478,16 @@ pmap_page_protect(pg, prot)
simple_lock(&pvh->pvh_slock);
for (pv = LIST_FIRST(&pvh->pvh_list); pv != NULL; pv = nextpv) {
nextpv = LIST_NEXT(pv, pv_list);
PMAP_LOCK(pv->pv_pmap);
pmap = pv->pv_pmap;
PMAP_LOCK(pmap);
#ifdef DEBUG
if (pmap_pte_v(pmap_l2pte(pv->pv_pmap, pv->pv_va, NULL)) == 0 ||
pmap_pte_pa(pv->pv_pte) != pa)
panic("pmap_page_protect: bad mapping");
#endif
if (pmap_pte_w(pv->pv_pte) == 0)
needisync |= pmap_remove_mapping(pv->pv_pmap,
needisync |= pmap_remove_mapping(pmap,
pv->pv_va, pv->pv_pte, FALSE, cpu_id, NULL);
#ifdef DEBUG
else {
@ -1496,7 +1499,7 @@ pmap_page_protect(pg, prot)
}
}
#endif
PMAP_UNLOCK(pv->pv_pmap);
PMAP_UNLOCK(pmap);
}
if (needisync)