linux-kernel - [PATCH] bus: arm-cci: release node before breaking child_of

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Message-ID: <Y+kFyUVMkfuugwit@ubun2204.myguest.virtualbox.org>
Date:   Sun, 12 Feb 2023 20:59:13 +0530
From:   Deepak R Varma <drv@...lo.com>
To:     linux-kernel@...r.kernel.org
Cc:     Saurabh Singh Sengar <ssengar@...rosoft.com>,
        Praveen Kumar <kumarpraveen@...ux.microsoft.com>,
        Deepak R Varma <drv@...lo.com>
Subject: [PATCH] bus: arm-cci: release node before breaking child_of_node loop

The iterator for_each_available_child_of_node() increments the refcount
of the child node it is processing. Release such a reference when the
loop needs to break due to an error during its execution.
Issue identified using for_each_child.cocci Coccinelle semantic patch.

Signed-off-by: Deepak R Varma <drv@...lo.com>
---
Please note: The proposed change is compile tested only. I do not have the
necessary hardware to perform additional testing. Please suggest if there is an
alternate means available to further test this change.

 drivers/bus/arm-cci.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
index b8184a903583..1f84a5528073 100644
--- a/drivers/bus/arm-cci.c
+++ b/drivers/bus/arm-cci.c
@@ -461,8 +461,10 @@ static int cci_probe_ports(struct device_node *np)
 
 		i = nb_ace + nb_ace_lite;
 
-		if (i >= nb_cci_ports)
+		if (i >= nb_cci_ports) {
+			of_node_put(cp);
 			break;
+		}
 
 		if (of_property_read_string(cp, "interface-type",
 					&match_str)) {
-- 
2.34.1