powerpc: fix unbalanced node refcount in check_kvm_guest()

[ Upstream commit 56537faf8821e361d739fc5ff58c9c40f54a1d4c ]

When check_kvm_guest() succeeds in looking up a /hypervisor OF node, it
returns without performing a matching put for the lookup, leaving the
node's reference count elevated.

Add the necessary call to of_node_put(), rearranging the code slightly to
avoid repetition or goto.

Fixes: 107c55005fbd ("powerpc/pseries: Add KVM guest doorbell restrictions")
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Reviewed-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210928124550.132020-1-nathanl@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/powerpc/kernel/firmware.c b/arch/powerpc/kernel/firmware.c
index c7022c4..20328f7 100644 (file)
--- a/arch/powerpc/kernel/firmware.c
+++ b/arch/powerpc/kernel/firmware.c
@@ -31,11 +31,10 @@ int __init check_kvm_guest(void)
        if (!hyper_node)
                return 0;
 
-       if (!of_device_is_compatible(hyper_node, "linux,kvm"))
-               return 0;
-
-       static_branch_enable(&kvm_guest);
+       if (of_device_is_compatible(hyper_node, "linux,kvm"))
+               static_branch_enable(&kvm_guest);
 
+       of_node_put(hyper_node);
        return 0;
 }
 core_initcall(check_kvm_guest); // before kvm_guest_init()