kernel - MPSAFE work - Add missing token release

* Add a missing token release in a rare code path.

diff --git a/sys/platform/pc32/i386/pmap.c b/sys/platform/pc32/i386/pmap.c
index 78eb6ce..2d70cc2 100644 (file)
--- a/sys/platform/pc32/i386/pmap.c
+++ b/sys/platform/pc32/i386/pmap.c
@@ -1212,6 +1212,7 @@ pmap_puninit(pmap_t pmap)
        vm_page_t p;
 
        KKASSERT(pmap->pm_active == 0);
+       lwkt_gettoken(&vm_token);
        if ((p = pmap->pm_pdirm) != NULL) {
                KKASSERT(pmap->pm_pdir != NULL);
                pmap_kremove((vm_offset_t)pmap->pm_pdir);
@@ -1222,6 +1223,7 @@ pmap_puninit(pmap_t pmap)
                vm_page_free_zero(p);
                pmap->pm_pdirm = NULL;
        }
+       lwkt_reltoken(&vm_token);
        if (pmap->pm_pdir) {
                kmem_free(&kernel_map, (vm_offset_t)pmap->pm_pdir, PAGE_SIZE);
                pmap->pm_pdir = NULL;
@@ -2048,9 +2050,7 @@ pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
                return;
 
        if ((prot & VM_PROT_READ) == VM_PROT_NONE) {
-               lwkt_gettoken(&vm_token);
                pmap_remove(pmap, sva, eva);
-               lwkt_reltoken(&vm_token);
                return;
        }
 
@@ -2823,6 +2823,7 @@ pmap_page_exists_quick(pmap_t pmap, vm_page_t m)
        lwkt_gettoken(&vm_token);
        TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
                if (pv->pv_pmap == pmap) {
+                       lwkt_reltoken(&vm_token);
                        crit_exit();
                        return TRUE;
                }