Author: gonzo
Date: Mon Jun 25 17:50:11 2012
New Revision: 237566
URL: http://svn.freebsd.org/changeset/base/237566
Log:
Handle case when result of pmap_pte is NULL. This issue was uncovered
by r237367
Modified:
head/sys/mips/mips/pmap.c
Modified: head/sys/mips/mips/pmap.c
==============================================================================
--- head/sys/mips/mips/pmap.c Mon Jun 25 17:15:09 2012 (r237565)
+++ head/sys/mips/mips/pmap.c Mon Jun 25 17:50:11 2012 (r237566)
@@ -765,6 +765,7 @@ pmap_extract(pmap_t pmap, vm_offset_t va
vm_page_t
pmap_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot)
{
+ pt_entry_t *ptep;
pt_entry_t pte;
vm_page_t m;
vm_paddr_t pa;
@@ -773,8 +774,9 @@ pmap_extract_and_hold(pmap_t pmap, vm_of
pa = 0;
PMAP_LOCK(pmap);
retry:
- pte = *pmap_pte(pmap, va);
- if (pte != 0 && pte_test(&pte, PTE_V) &&
+ ptep = pmap_pte(pmap, va);
+ if ((ptep != NULL) && ((pte = *ptep) != 0) &&
+ pte_test(&pte, PTE_V) &&
(pte_test(&pte, PTE_D) || (prot & VM_PROT_WRITE) == 0)) {
if (vm_page_pa_tryrelock(pmap, TLBLO_PTE_TO_PA(pte), &pa))
goto retry;
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