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Subject[PATCH v2] powerpc: don't enable cpu hotplug on mpic-based pseries
Don't allow cpu hotplug on systems lacking XICS interrupt controller,
since current code is hardcoded for it.


Signed-off-by: Olof Johansson <olof@lixom.net>

---
On Wed, Oct 10, 2007 at 10:18:26AM +1000, Stephen Rothwell wrote:

> > + struct device_node *np;
> > + const char *typep;
> > +
> > + for (np = NULL; (np = of_find_node_by_name(np,
> > + "interrupt-controller"));) {
> > + typep = of_get_property(np, "compatible", NULL);
> > + if (strstr(typep, "open-pic")) {
> > + printk(KERN_INFO "CPU Hotplug not supported on "
> > + "systems using MPIC\n");
>
> You need an of_node_put(np) here.

Grmbl, you're right.

pseries_discover_pic() doesn't have one, that's where I took the above
logic from. So we're obviously already leaking device node references.

Still, no reason to make it worse.


-Olof

diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c
index 9711eb0..ae85fc0 100644
--- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
+++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
@@ -252,6 +252,21 @@ static struct notifier_block pseries_smp_nb = {

static int __init pseries_cpu_hotplug_init(void)
{
+ struct device_node *np;
+ const char *typep;
+
+ for (np = NULL; (np = of_find_node_by_name(np,
+ "interrupt-controller"));) {
+ typep = of_get_property(np, "compatible", NULL);
+ if (strstr(typep, "open-pic")) {
+ of_node_put(np);
+
+ printk(KERN_INFO "CPU Hotplug not supported on "
+ "systems using MPIC\n");
+ return 0;
+ }
+ }
+
rtas_stop_self_args.token = rtas_token("stop-self");
qcss_tok = rtas_token("query-cpu-stopped-state");

-
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