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powerpc: fix unbalanced node refcount in check_kvm_guest()

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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: 107c55005f ("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
This commit is contained in:
Nathan Lynch 2021-09-28 07:45:50 -05:00 committed by Michael Ellerman
parent f2719b26ae
commit 56537faf88
1 changed files with 3 additions and 4 deletions
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7
arch/powerpc/kernel/firmware.c
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@ -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()