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softint_overlay: disable kernel preemption before curlwp->l_cpu use.

This commit is contained in:
rmind 2010-01-09 19:02:17 +00:00
parent 77e2006c9f
commit a4c32a06f6
1 changed files with 10 additions and 6 deletions
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16
sys/kern/kern_softint.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_softint.c,v 1.30 2010/01/08 12:10:46 rmind Exp $ */
/* $NetBSD: kern_softint.c,v 1.31 2010/01/09 19:02:17 rmind Exp $ */
/*-
* Copyright (c) 2007, 2008 The NetBSD Foundation, Inc.
@ -176,7 +176,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_softint.c,v 1.30 2010/01/08 12:10:46 rmind Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_softint.c,v 1.31 2010/01/09 19:02:17 rmind Exp $");
#include <sys/param.h>
#include <sys/malloc.h>
@ -721,17 +721,21 @@ softint_overlay(void)
int s;
l = curlwp;
KASSERT((l->l_pflag & LP_INTR) == 0);
/*
* Arrange to elevate priority if the LWP blocks. Also, bind LWP
* to the CPU. Note: disable kernel preemption before doing that.
*/
s = splhigh();
ci = l->l_cpu;
si = ((softcpu_t *)ci->ci_data.cpu_softcpu)->sc_int;
KASSERT((l->l_pflag & LP_INTR) == 0);
/* Arrange to elevate priority if the LWP blocks. */
s = splhigh();
obase = l->l_kpribase;
l->l_kpribase = PRI_KERNEL_RT;
oflag = l->l_pflag;
l->l_pflag = oflag | LP_INTR | LP_BOUND;
while ((softints = ci->ci_data.cpu_softints) != 0) {
if ((softints & (1 << SOFTINT_SERIAL)) != 0) {
ci->ci_data.cpu_softints &= ~(1 << SOFTINT_SERIAL);