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When reading pr_securelevel from a prison, perform a lockless read,

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as it's an integer read operation and the resulting slight race is
acceptable.

MFC after:	1 week
This commit is contained in:
rwatson 2005-01-23 21:01:00 +00:00
parent 293a12c083
commit 1d8015ceb7
1 changed files with 0 additions and 4 deletions
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4
sys/kern/kern_prot.c
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@ -1276,10 +1276,8 @@ securelevel_gt(struct ucred *cr, int level)
active_securelevel = securelevel;
KASSERT(cr != NULL, ("securelevel_gt: null cr"));
if (cr->cr_prison != NULL) {
mtx_lock(&cr->cr_prison->pr_mtx);
active_securelevel = imax(cr->cr_prison->pr_securelevel,
active_securelevel);
mtx_unlock(&cr->cr_prison->pr_mtx);
}
return (active_securelevel > level ? EPERM : 0);
}
@ -1292,10 +1290,8 @@ securelevel_ge(struct ucred *cr, int level)
active_securelevel = securelevel;
KASSERT(cr != NULL, ("securelevel_ge: null cr"));
if (cr->cr_prison != NULL) {
mtx_lock(&cr->cr_prison->pr_mtx);
active_securelevel = imax(cr->cr_prison->pr_securelevel,
active_securelevel);
mtx_unlock(&cr->cr_prison->pr_mtx);
}
return (active_securelevel >= level ? EPERM : 0);
}