linux-kernel - [PATCH] powerpc/kexec: fix for_each

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Date:   Tue, 3 Aug 2021 16:59:55 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
cc:     linux-kernel@...r.kernel.org, kbuild-all@...ts.01.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        kbuild-all@...ts.01.org,
        Sumera Priyadarsini <sylphrenadin@...il.com>
Subject: [PATCH] powerpc/kexec: fix for_each_child.cocci warning

From: kernel test robot <lkp@...el.com>

for_each_node_by_type should have of_node_put() before return.

Generated by: scripts/coccinelle/iterators/for_each_child.cocci

CC: Sumera Priyadarsini <sylphrenadin@...il.com>
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: kernel test robot <lkp@...el.com>
---

The code seems to have been this way since the beginning of time.  Perhaps
the of_node_put is a no op for this code?

 core_64.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/arch/powerpc/kexec/core_64.c
+++ b/arch/powerpc/kexec/core_64.c
@@ -64,8 +64,10 @@ int default_machine_kexec_prepare(struct
 			begin = image->segment[i].mem;
 			end = begin + image->segment[i].memsz;

-			if ((begin < high) && (end > low))
+			if ((begin < high) && (end > low)) {
+				of_node_put(node);
 				return -ETXTBSY;
+			}
 		}
 	}