[Xen-devel] [PATCH RFCv2 4/6] powerpc/powernv: hold device_hotplug_lock when calling device_online()

[David Hildenbrand <david@xxxxxxxxxx>]

device_online() should be called with device_hotplug_lock() held.

Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Rashmica Gupta <rashmica.g@xxxxxxxxx>
Cc: Balbir Singh <bsingharora@xxxxxxxxx>
Cc: Michael Neuling <mikey@xxxxxxxxxxx>
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
---
 arch/powerpc/platforms/powernv/memtrace.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/platforms/powernv/memtrace.c 
b/arch/powerpc/platforms/powernv/memtrace.c
index 8f1cd4f3bfd5..ef7181d4fe68 100644
--- a/arch/powerpc/platforms/powernv/memtrace.c
+++ b/arch/powerpc/platforms/powernv/memtrace.c
@@ -229,9 +229,11 @@ static int memtrace_online(void)
                 * we need to online the memory ourselves.
                 */
                if (!memhp_auto_online) {
+                       lock_device_hotplug();
                        walk_memory_range(PFN_DOWN(ent->start),
                                          PFN_UP(ent->start + ent->size - 1),
                                          NULL, online_mem_block);
+                       unlock_device_hotplug();
                }
 
                /*
-- 
2.17.1


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