0f0f1b400c
Voyager fiddles with current->signal.tty without locking. It turns out that the code in question has already cleared current->signal.tty correctly because daemonize() does the right thing already. The signal handling also appears to be incorrect as it does an unprotected sigfillset that also appears unneccessary. As I don't have a bowtie and am therefore not a qualified voyager maintainer I leave that to James. Signed-off-by: Alan Cox <alan@redhat.com> Acked-by: James Bottomley <James.Bottomley@steeleye.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
163 lines
3.5 KiB
C
163 lines
3.5 KiB
C
/* -*- mode: c; c-basic-offset: 8 -*- */
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/* Copyright (C) 2001
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*
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* Author: J.E.J.Bottomley@HansenPartnership.com
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*
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* linux/arch/i386/kernel/voyager_thread.c
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*
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* This module provides the machine status monitor thread for the
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* voyager architecture. This allows us to monitor the machine
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* environment (temp, voltage, fan function) and the front panel and
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* internal UPS. If a fault is detected, this thread takes corrective
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* action (usually just informing init)
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* */
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/kernel_stat.h>
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#include <linux/delay.h>
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#include <linux/mc146818rtc.h>
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#include <linux/smp_lock.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/kmod.h>
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#include <linux/completion.h>
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#include <linux/sched.h>
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#include <asm/desc.h>
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#include <asm/voyager.h>
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#include <asm/vic.h>
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#include <asm/mtrr.h>
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#include <asm/msr.h>
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#define THREAD_NAME "kvoyagerd"
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/* external variables */
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int kvoyagerd_running = 0;
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DECLARE_MUTEX_LOCKED(kvoyagerd_sem);
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static int thread(void *);
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static __u8 set_timeout = 0;
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/* Start the machine monitor thread. Return 1 if OK, 0 if fail */
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static int __init
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voyager_thread_start(void)
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{
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if(kernel_thread(thread, NULL, CLONE_KERNEL) < 0) {
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/* This is serious, but not fatal */
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printk(KERN_ERR "Voyager: Failed to create system monitor thread!!!\n");
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return 1;
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}
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return 0;
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}
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static int
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execute(const char *string)
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{
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int ret;
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char *envp[] = {
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"HOME=/",
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"TERM=linux",
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"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
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NULL,
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};
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char *argv[] = {
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"/bin/bash",
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"-c",
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(char *)string,
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NULL,
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};
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if ((ret = call_usermodehelper(argv[0], argv, envp, 1)) != 0) {
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printk(KERN_ERR "Voyager failed to run \"%s\": %i\n",
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string, ret);
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}
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return ret;
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}
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static void
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check_from_kernel(void)
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{
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if(voyager_status.switch_off) {
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/* FIXME: This should be configureable via proc */
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execute("umask 600; echo 0 > /etc/initrunlvl; kill -HUP 1");
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} else if(voyager_status.power_fail) {
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VDEBUG(("Voyager daemon detected AC power failure\n"));
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/* FIXME: This should be configureable via proc */
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execute("umask 600; echo F > /etc/powerstatus; kill -PWR 1");
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set_timeout = 1;
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}
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}
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static void
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check_continuing_condition(void)
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{
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if(voyager_status.power_fail) {
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__u8 data;
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voyager_cat_psi(VOYAGER_PSI_SUBREAD,
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VOYAGER_PSI_AC_FAIL_REG, &data);
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if((data & 0x1f) == 0) {
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/* all power restored */
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printk(KERN_NOTICE "VOYAGER AC power restored, cancelling shutdown\n");
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/* FIXME: should be user configureable */
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execute("umask 600; echo O > /etc/powerstatus; kill -PWR 1");
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set_timeout = 0;
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}
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}
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}
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static void
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wakeup(unsigned long unused)
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{
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up(&kvoyagerd_sem);
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}
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static int
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thread(void *unused)
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{
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struct timer_list wakeup_timer;
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kvoyagerd_running = 1;
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daemonize(THREAD_NAME);
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set_timeout = 0;
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init_timer(&wakeup_timer);
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sigfillset(¤t->blocked);
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printk(KERN_NOTICE "Voyager starting monitor thread\n");
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for(;;) {
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down_interruptible(&kvoyagerd_sem);
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VDEBUG(("Voyager Daemon awoken\n"));
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if(voyager_status.request_from_kernel == 0) {
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/* probably awoken from timeout */
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check_continuing_condition();
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} else {
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check_from_kernel();
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voyager_status.request_from_kernel = 0;
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}
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if(set_timeout) {
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del_timer(&wakeup_timer);
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wakeup_timer.expires = HZ + jiffies;
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wakeup_timer.function = wakeup;
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add_timer(&wakeup_timer);
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}
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}
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}
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static void __exit
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voyager_thread_stop(void)
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{
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/* FIXME: do nothing at the moment */
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}
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module_init(voyager_thread_start);
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//module_exit(voyager_thread_stop);
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