powerpc: use device_online/offline() instead of cpu_up/down()

In powerpc pseries platform dlpar operations, use device_online() and
device_offline() instead of cpu_up() and cpu_down().

Calling cpu_up/down() directly does not update the cpu device offline
field, which is used to online/offline a cpu from sysfs. Calling
device_online/offline() instead keeps the sysfs cpu online value
correct. The hotplug lock, which is required to be held when calling
device_online/offline(), is already held when dlpar_online/offline_cpu()
are called, since they are called only from cpu_probe|release_store().

This patch fixes errors on phyp (PowerVM) systems that have cpu(s)
added/removed using dlpar operations; without this patch, the
/sys/devices/system/cpu/cpuN/online nodes do not correctly show the
online state of added/removed cpus.

Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Cc: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Fixes: 0902a9044fa5 ("Driver core: Use generic offline/online for CPU offline/online")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c
index 6ad83bd11fe2..c22bb1b4beb8 100644
--- a/arch/powerpc/platforms/pseries/dlpar.c
+++ b/arch/powerpc/platforms/pseries/dlpar.c
@@ -382,7 +382,7 @@ static int dlpar_online_cpu(struct device_node *dn)
                         BUG_ON(get_cpu_current_state(cpu)
                                         != CPU_STATE_OFFLINE);
                         cpu_maps_update_done();
-                        rc = cpu_up(cpu);
+                        rc = device_online(get_cpu_device(cpu));
                         if (rc)
                                 goto out;
                         cpu_maps_update_begin();
@@ -467,7 +467,7 @@ static int dlpar_offline_cpu(struct device_node *dn)
                         if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) {
                                 set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
                                 cpu_maps_update_done();
-                                rc = cpu_down(cpu);
+                                rc = device_offline(get_cpu_device(cpu));
                                 if (rc)
                                         goto out;
                                 cpu_maps_update_begin();