powerpc/pseries: Correct memory hotplug locking

Memory dlpar handling can return from dlpar_memory() without releasing the
device_hotplug lock. Correct this routine to ensure the lock is released.

Fixes: 5f97b2a0d176 ("powerpc/pseries: Implement memory hotplug add in the kernel")
Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
index 742ef88..5cefcad 100644 (file)
--- a/arch/powerpc/platforms/pseries/hotplug-memory.c
+++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
@@ -562,13 +562,15 @@ int dlpar_memory(struct pseries_hp_errorlog *hp_elog)
        lock_device_hotplug();
 
        dn = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
-       if (!dn)
-               return -EINVAL;
+       if (!dn) {
+               rc = -EINVAL;
+               goto dlpar_memory_out;
+       }
 
        prop = dlpar_clone_drconf_property(dn);
        if (!prop) {
-               of_node_put(dn);
-               return -EINVAL;
+               rc = -EINVAL;
+               goto dlpar_memory_out;
        }
 
        switch (hp_elog->action) {
@@ -599,6 +601,7 @@ int dlpar_memory(struct pseries_hp_errorlog *hp_elog)
        else
                dlpar_update_drconf_property(dn, prop);
 
+dlpar_memory_out:
        of_node_put(dn);
        unlock_device_hotplug();
        return rc;