linux-kernel - [PATCH] soc: ti: knav_qmss: Put refcount for dev node in failure case

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Date:   Wed, 16 Dec 2020 13:26:52 +0100
From:   Vasyl Gomonovych <gomonovych@...il.com>
To:     ssantosh@...nel.org
Cc:     Vasyl Gomonovych <gomonovych@...il.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] soc: ti: knav_qmss: Put refcount for dev node in failure case

for_each_child_of_node increases refcount for each device_node and decreases previous one
in a loop, but in case jump out of a loop current node refcount has no chnase for decreases
so requires an of_node_put for jupm out cases.

Fix based on raport from
scripts/coccinelle/iterators/for_each_child.cocci

Signed-off-by: Vasyl Gomonovych <gomonovych@...il.com>
---
 drivers/soc/ti/knav_dma.c        | 1 +
 drivers/soc/ti/knav_qmss_queue.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/drivers/soc/ti/knav_dma.c b/drivers/soc/ti/knav_dma.c
index 8c863ecb1c60..9d25546e4d96 100644
--- a/drivers/soc/ti/knav_dma.c
+++ b/drivers/soc/ti/knav_dma.c
@@ -757,6 +757,7 @@ static int knav_dma_probe(struct platform_device *pdev)
 	for_each_child_of_node(node, child) {
 		ret = dma_init(node, child);
 		if (ret) {
+			of_node_put(child);
 			dev_err(&pdev->dev, "init failed with %d\n", ret);
 			break;
 		}
diff --git a/drivers/soc/ti/knav_qmss_queue.c b/drivers/soc/ti/knav_qmss_queue.c
index a460f201bf8e..f9fc639abad2 100644
--- a/drivers/soc/ti/knav_qmss_queue.c
+++ b/drivers/soc/ti/knav_qmss_queue.c
@@ -1086,6 +1086,7 @@ static int knav_queue_setup_regions(struct knav_device *kdev,
 	for_each_child_of_node(regions, child) {
 		region = devm_kzalloc(dev, sizeof(*region), GFP_KERNEL);
 		if (!region) {
+			of_node_put(child);
 			dev_err(dev, "out of memory allocating region\n");
 			return -ENOMEM;
 		}
@@ -1399,6 +1400,7 @@ static int knav_queue_init_qmgrs(struct knav_device *kdev,
 	for_each_child_of_node(qmgrs, child) {
 		qmgr = devm_kzalloc(dev, sizeof(*qmgr), GFP_KERNEL);
 		if (!qmgr) {
+			of_node_put(child);
 			dev_err(dev, "out of memory allocating qmgr\n");
 			return -ENOMEM;
 		}
@@ -1498,6 +1500,7 @@ static int knav_queue_init_pdsps(struct knav_device *kdev,
 	for_each_child_of_node(pdsps, child) {
 		pdsp = devm_kzalloc(dev, sizeof(*pdsp), GFP_KERNEL);
 		if (!pdsp) {
+			of_node_put(child);
 			dev_err(dev, "out of memory allocating pdsp\n");
 			return -ENOMEM;
 		}
-- 
2.17.1