[PATCH v05 8/9] hotplug/rtas: No rtas_event_scan during PMT update

[Michael Bringmann]

hotplug/rtas: Disable rtas_event_scan during device-tree property
updates after migration to reduce conflicts with changes propagated
to other parts of the kernel configuration, such as CPUs or memory.

Signed-off-by: Michael Bringmann <m...@linux.vnet.ibm.com>
---
 arch/powerpc/platforms/pseries/hotplug-cpu.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c 
b/arch/powerpc/platforms/pseries/hotplug-cpu.c
index 6267b53..f5c9e8f 100644
--- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
+++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
@@ -686,14 +686,18 @@ static int dlpar_cpu_readd_by_index(u32 drc_index)
 
        pr_info("Attempting to re-add CPU, drc index %x\n", drc_index);
 
+       rtas_event_scan_disable();
        arch_update_cpu_topology_suspend();
        rc = dlpar_cpu_remove_by_index(drc_index, false);
        arch_update_cpu_topology_resume();
+       rtas_event_scan_enable();
 
        if (!rc) {
+               rtas_event_scan_disable();
                arch_update_cpu_topology_suspend();
                rc = dlpar_cpu_add(drc_index, false);
                arch_update_cpu_topology_resume();
+               rtas_event_scan_enable();
        }
 
        if (rc)