diff mbox series

[v3,3/4] soc: ti: knav_qmss_queue: do device_node auto cleanup

Message ID 20240707055341.3656-4-five231003@gmail.com (mailing list archive)
State New, archived
Headers show
Series Do device node auto cleanup in drivers/soc/ti/ | expand

Commit Message

Kousik Sanagavarapu July 7, 2024, 5:14 a.m. UTC 
Use scope based cleanup, instead of manual of_node_put() calls, which
automatically free()s "struct device_node".

While at it, refactor the code from knav_queue_probe() into the seperate
functions to make auto cleanup look more neat.

Doing the cleanup this way has the advantage of reducing the chance of
memory leaks in case we need to read from new OF nodes in the future
when we probe.

Suggested-by: Julia Lawall <julia.lawall@inria.fr>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Kousik Sanagavarapu <five231003@gmail.com>
---
 drivers/soc/ti/knav_qmss_queue.c | 100 ++++++++++++++++---------------
 1 file changed, 53 insertions(+), 47 deletions(-)
diff mbox series

Patch

diff --git a/drivers/soc/ti/knav_qmss_queue.c b/drivers/soc/ti/knav_qmss_queue.c
index 06fb5505c22c..f4b603719055 100644
--- a/drivers/soc/ti/knav_qmss_queue.c
+++ b/drivers/soc/ti/knav_qmss_queue.c
@@ -1076,14 +1076,20 @@  static const char *knav_queue_find_name(struct device_node *node)
 }
 
 static int knav_queue_setup_regions(struct knav_device *kdev,
-					struct device_node *regions)
+				    struct device_node *node)
 {
 	struct device *dev = kdev->dev;
+	struct device_node *regions __free(device_node) =
+			of_get_child_by_name(node, "descriptor-regions");
 	struct knav_region *region;
 	struct device_node *child;
 	u32 temp[2];
 	int ret;
 
+	if (!regions)
+		return dev_err_probe(dev, -ENODEV,
+				     "descriptor-regions not specified\n");
+
 	for_each_child_of_node(regions, child) {
 		region = devm_kzalloc(dev, sizeof(*region), GFP_KERNEL);
 		if (!region) {
@@ -1121,10 +1127,9 @@  static int knav_queue_setup_regions(struct knav_device *kdev,
 		INIT_LIST_HEAD(&region->pools);
 		list_add_tail(&region->list, &kdev->regions);
 	}
-	if (list_empty(&kdev->regions)) {
-		dev_err(dev, "no valid region information found\n");
-		return -ENODEV;
-	}
+	if (list_empty(&kdev->regions))
+		return dev_err_probe(dev, -ENODEV,
+				     "no valid region information found\n");
 
 	/* Next, we run through the regions and set things up */
 	for_each_region(kdev, region)
@@ -1306,10 +1311,16 @@  static int knav_setup_queue_range(struct knav_device *kdev,
 }
 
 static int knav_setup_queue_pools(struct knav_device *kdev,
-				   struct device_node *queue_pools)
+				  struct device_node *node)
 {
+	struct device_node *queue_pools __free(device_node) =
+			of_get_child_by_name(node, "queue-pools");
 	struct device_node *type, *range;
 
+	if (!queue_pools)
+		return dev_err_probe(kdev->dev, -ENODEV,
+				     "queue-pools not specified\n");
+
 	for_each_child_of_node(queue_pools, type) {
 		for_each_child_of_node(type, range) {
 			/* return value ignored, we init the rest... */
@@ -1318,10 +1329,9 @@  static int knav_setup_queue_pools(struct knav_device *kdev,
 	}
 
 	/* ... and barf if they all failed! */
-	if (list_empty(&kdev->queue_ranges)) {
-		dev_err(kdev->dev, "no valid queue range found\n");
-		return -ENODEV;
-	}
+	if (list_empty(&kdev->queue_ranges))
+		return dev_err_probe(kdev->dev, -ENODEV,
+				     "no valid queue range found\n");
 	return 0;
 }
 
@@ -1389,14 +1399,20 @@  static void __iomem *knav_queue_map_reg(struct knav_device *kdev,
 }
 
 static int knav_queue_init_qmgrs(struct knav_device *kdev,
-					struct device_node *qmgrs)
+				 struct device_node *node)
 {
 	struct device *dev = kdev->dev;
+	struct device_node *qmgrs __free(device_node) =
+			of_get_child_by_name(node, "qmgrs");
 	struct knav_qmgr_info *qmgr;
 	struct device_node *child;
 	u32 temp[2];
 	int ret;
 
+	if (!qmgrs)
+		return dev_err_probe(dev, -ENODEV,
+				     "queue manager info not specified\n");
+
 	for_each_child_of_node(qmgrs, child) {
 		qmgr = devm_kzalloc(dev, sizeof(*qmgr), GFP_KERNEL);
 		if (!qmgr) {
@@ -1668,6 +1684,26 @@  static int knav_queue_start_pdsps(struct knav_device *kdev)
 	return 0;
 }
 
+static int knav_queue_setup_pdsps(struct knav_device *kdev,
+				  struct device_node *node)
+{
+	struct device_node *pdsps __free(device_node) =
+			of_get_child_by_name(node, "pdsps");
+
+	if (pdsps) {
+		int ret;
+
+		ret = knav_queue_init_pdsps(kdev, pdsps);
+		if (ret)
+			return ret;
+
+		ret = knav_queue_start_pdsps(kdev);
+		if (ret)
+			return ret;
+	}
+	return 0;
+}
+
 static inline struct knav_qmgr_info *knav_find_qmgr(unsigned id)
 {
 	struct knav_qmgr_info *qmgr;
@@ -1755,7 +1791,6 @@  MODULE_DEVICE_TABLE(of, keystone_qmss_of_match);
 static int knav_queue_probe(struct platform_device *pdev)
 {
 	struct device_node *node = pdev->dev.of_node;
-	struct device_node *qmgrs, *queue_pools, *regions, *pdsps;
 	struct device *dev = &pdev->dev;
 	u32 temp[2];
 	int ret;
@@ -1799,39 +1834,17 @@  static int knav_queue_probe(struct platform_device *pdev)
 	kdev->num_queues = temp[1];
 
 	/* Initialize queue managers using device tree configuration */
-	qmgrs =  of_get_child_by_name(node, "qmgrs");
-	if (!qmgrs) {
-		dev_err(dev, "queue manager info not specified\n");
-		ret = -ENODEV;
-		goto err;
-	}
-	ret = knav_queue_init_qmgrs(kdev, qmgrs);
-	of_node_put(qmgrs);
+	ret = knav_queue_init_qmgrs(kdev, node);
 	if (ret)
 		goto err;
 
 	/* get pdsp configuration values from device tree */
-	pdsps =  of_get_child_by_name(node, "pdsps");
-	if (pdsps) {
-		ret = knav_queue_init_pdsps(kdev, pdsps);
-		if (ret)
-			goto err;
-
-		ret = knav_queue_start_pdsps(kdev);
-		if (ret)
-			goto err;
-	}
-	of_node_put(pdsps);
+	ret = knav_queue_setup_pdsps(kdev, node);
+	if (ret)
+		goto err;
 
 	/* get usable queue range values from device tree */
-	queue_pools = of_get_child_by_name(node, "queue-pools");
-	if (!queue_pools) {
-		dev_err(dev, "queue-pools not specified\n");
-		ret = -ENODEV;
-		goto err;
-	}
-	ret = knav_setup_queue_pools(kdev, queue_pools);
-	of_node_put(queue_pools);
+	ret = knav_setup_queue_pools(kdev, node);
 	if (ret)
 		goto err;
 
@@ -1853,14 +1866,7 @@  static int knav_queue_probe(struct platform_device *pdev)
 	if (ret)
 		goto err;
 
-	regions = of_get_child_by_name(node, "descriptor-regions");
-	if (!regions) {
-		dev_err(dev, "descriptor-regions not specified\n");
-		ret = -ENODEV;
-		goto err;
-	}
-	ret = knav_queue_setup_regions(kdev, regions);
-	of_node_put(regions);
+	ret = knav_queue_setup_regions(kdev, node);
 	if (ret)
 		goto err;