powerpc: fix unbalanced node refcount in check_kvm_guest()

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[ Upstream commit 56537faf88 ]

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
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Nathan Lynch 2021-09-28 07:45:50 -05:00 • committed by Greg Kroah-Hartman

parent 2af070265d

commit ddd95eb01a

1 changed files with 3 additions and 4 deletions

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arch/powerpc/kernel/firmware.c

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