linux-kernel - [PATCH] soc: ti: knav: Use of_property_read_variable_u32

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Message-ID: <20240731201407.1838385-3-robh@kernel.org>
Date: Wed, 31 Jul 2024 14:13:58 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Nishanth Menon <nm@...com>,
	Santosh Shilimkar <ssantosh@...nel.org>
Cc: linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] soc: ti: knav: Use of_property_read_variable_u32_array()

There's no need to get the length of an DT array property before
parsing the array. of_property_read_variable_u32_array() takes a minimum
and maximum length and returns the actual length (or error code).

This is part of a larger effort to remove callers of of_find_property()
and similar functions. of_find_property() leaks the DT struct property
and data pointers which is a problem for dynamically allocated nodes
which may be freed.

Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
---
 drivers/soc/ti/knav_dma.c | 22 +++++-----------------
 1 file changed, 5 insertions(+), 17 deletions(-)

diff --git a/drivers/soc/ti/knav_dma.c b/drivers/soc/ti/knav_dma.c
index 6023006685fc..fb0746d8caad 100644
--- a/drivers/soc/ti/knav_dma.c
+++ b/drivers/soc/ti/knav_dma.c
@@ -602,7 +602,7 @@ static int dma_init(struct device_node *cloud, struct device_node *dma_node)
 	unsigned max_tx_chan, max_rx_chan, max_rx_flow, max_tx_sched;
 	struct device_node *node = dma_node;
 	struct knav_dma_device *dma;
-	int ret, len, num_chan = 0;
+	int ret, num_chan = 0;
 	resource_size_t size;
 	u32 timeout;
 	u32 i;
@@ -615,25 +615,13 @@ static int dma_init(struct device_node *cloud, struct device_node *dma_node)
 	INIT_LIST_HEAD(&dma->list);
 	INIT_LIST_HEAD(&dma->chan_list);
 
-	if (!of_find_property(cloud, "ti,navigator-cloud-address", &len)) {
-		dev_err(kdev->dev, "unspecified navigator cloud addresses\n");
-		return -ENODEV;
-	}
-
-	dma->logical_queue_managers = len / sizeof(u32);
-	if (dma->logical_queue_managers > DMA_MAX_QMS) {
-		dev_warn(kdev->dev, "too many queue mgrs(>%d) rest ignored\n",
-			 dma->logical_queue_managers);
-		dma->logical_queue_managers = DMA_MAX_QMS;
-	}
-
-	ret = of_property_read_u32_array(cloud, "ti,navigator-cloud-address",
-					dma->qm_base_address,
-					dma->logical_queue_managers);
-	if (ret) {
+	ret = of_property_read_variable_u32_array(cloud, "ti,navigator-cloud-address",
+						  dma->qm_base_address, 1, DMA_MAX_QMS);
+	if (ret < 0) {
 		dev_err(kdev->dev, "invalid navigator cloud addresses\n");
 		return -ENODEV;
 	}
+	dma->logical_queue_managers = ret;
 
 	dma->reg_global	 = pktdma_get_regs(dma, node, 0, &size);
 	if (IS_ERR(dma->reg_global))
-- 
2.43.0