[PATCH] ppc32: fix powersave with interrupts disabled

Kumar Gala galak at freescale.com
Tue Jan 25 08:51:42 EST 2005

It looks like the problem has to do with entering the powersave routine 
with irqs disabled. Here is a patch that will only enter powersave if irqs 
are enabled.

Entering powersave on PPC while irqs are disabled causes a hang. Only 
enter powersave if irqs are disabled.

Signed-off-by: Brian Waite <waite at skycomputers.com> 
Signed-off-by: Kumar Gala <kumar.gala at freescale.com>

diff -Nru a/arch/ppc/kernel/idle.c b/arch/ppc/kernel/idle.c
--- a/arch/ppc/kernel/idle.c	2005-01-24 15:48:24 -06:00
+++ b/arch/ppc/kernel/idle.c	2005-01-24 15:48:24 -06:00
@@ -39,7 +39,7 @@
 	powersave = ppc_md.power_save;
 	if (!need_resched()) {
-		if (powersave != NULL)
+		if (powersave != NULL && !irqs_disabled())
 		else {
 #ifdef CONFIG_SMP

More information about the Linuxppc-dev mailing list