linux-kernel - [PATCH] iommu: Use of_property

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Message-ID: <20240731191312.1710417-6-robh@kernel.org>
Date: Wed, 31 Jul 2024 13:12:44 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>
Cc: iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH] iommu: Use of_property_present()

Use of_property_present() to test for property presence rather than
of_(find|get)_property(). 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/iommu/fsl_pamu_domain.c | 4 +---
 drivers/iommu/of_iommu.c        | 2 +-
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
index e9d2bff4659b..30be786bff11 100644
--- a/drivers/iommu/fsl_pamu_domain.c
+++ b/drivers/iommu/fsl_pamu_domain.c
@@ -416,14 +416,12 @@ static struct iommu_group *fsl_pamu_device_group(struct device *dev)
 
 static struct iommu_device *fsl_pamu_probe_device(struct device *dev)
 {
-	int len;
-
 	/*
 	 * uboot must fill the fsl,liodn for platform devices to be supported by
 	 * the iommu.
 	 */
 	if (!dev_is_pci(dev) &&
-	    !of_get_property(dev->of_node, "fsl,liodn", &len))
+	    !of_property_present(dev->of_node, "fsl,liodn"))
 		return ERR_PTR(-ENODEV);
 
 	return &pamu_iommu;
diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index 78d61da75257..e7a6a1611d19 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -214,7 +214,7 @@ void of_iommu_get_resv_regions(struct device *dev, struct list_head *list)
 		 * that represent reservations in the IOVA space, which are regions that should
 		 * not be mapped.
 		 */
-		if (of_find_property(it.node, "reg", NULL)) {
+		if (of_property_present(it.node, "reg")) {
 			err = of_address_to_resource(it.node, 0, &phys);
 			if (err < 0) {
 				dev_err(dev, "failed to parse memory region %pOF: %d\n",
-- 
2.43.0