ctrl_alt_del() is called from hard interrupt context.
It traverses the reboot_notifier_list. Many of the
callouts on that list are not designed to be called
in this context.
DAC960_Finalise()
Calls remove_proc_entry() within interrupt context.
remove_proc_entry uses spin_lock()s.
Can deadlock.
drivers/char/sbc60xxwdt.c:sbc60xxwdt_unload()
Calls misc_deregister which calls down().
drivers/i2o/i2o_core.c
calls i2o_post_wait()
calls i2o_reset_controller()
Both of these schedule(). Crashes every time.
drivers/scsi/gdth.c
gdth_halt()
calls gdth_do_cmd
does down().
This patch makes keventd do the callout.
--- linux-2.4.3-pre1/kernel/sys.c Tue Oct 17 06:58:51 2000
+++ linux-akpm/kernel/sys.c Sun Mar 4 22:04:57 2001
@@ -330,6 +330,12 @@
return 0;
}
+static void deferred_cad(void *dummy)
+{
+ notifier_call_chain(&reboot_notifier_list, SYS_RESTART, NULL);
+ machine_restart(NULL);
+}
+
/*
* This function gets called by ctrl-alt-del - ie the keyboard interrupt.
* As it's called within an interrupt, it may NOT sync: the only choice
@@ -337,10 +343,13 @@
*/
void ctrl_alt_del(void)
{
- if (C_A_D) {
- notifier_call_chain(&reboot_notifier_list, SYS_RESTART, NULL);
- machine_restart(NULL);
- } else
+ static struct tq_struct cad_tq = {
+ routine: deferred_cad,
+ };
+
+ if (C_A_D)
+ schedule_task(&cad_tq);
+ else
kill_proc(1, SIGINT, 1);
}