linux-kernel - [PATCH v3 1/5] iommu/mediatek-v1: Clean up redundant fwspec checks

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Message-Id: <7d6ebec135483f889af00eb376aa31c012efc3b2.1719919669.git.robin.murphy@arm.com>
Date: Tue,  2 Jul 2024 12:40:47 +0100
From: Robin Murphy <robin.murphy@....com>
To: Will Deacon <will@...nel.org>,
	Joerg Roedel <joro@...tes.org>
Cc: linux-acpi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	iommu@...ts.linux.dev,
	devicetree@...r.kernel.org,
	Rob Herring <robh@...nel.org>,
	Saravana Kannan <saravanak@...gle.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Hanjun Guo <guohanjun@...wei.com>,
	Sudeep Holla <sudeep.holla@....com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>,
	Jean-Philippe Brucker <jean-philippe@...aro.org>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	Yong Wu <yong.wu@...iatek.com>,
	kernel test robot <lkp@...el.com>
Subject: [PATCH v3 1/5] iommu/mediatek-v1: Clean up redundant fwspec checks

The driver explicitly clears any existing fwspec before calling
mtk_iommu_v1_create_mapping(), but even if it didn't, the checks it's
doing there duplicate what iommu_fwspec_init() would do anyway. Clean
them up.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202407020415.KKnhPTUj-lkp@intel.com/
Signed-off-by: Robin Murphy <robin.murphy@....com>
---
 drivers/iommu/mtk_iommu_v1.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
index d6e4002200bd..2b64ea46318f 100644
--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -401,7 +401,6 @@ static const struct iommu_ops mtk_iommu_v1_ops;
 static int mtk_iommu_v1_create_mapping(struct device *dev,
 				       const struct of_phandle_args *args)
 {
-	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct mtk_iommu_v1_data *data;
 	struct platform_device *m4updev;
 	struct dma_iommu_mapping *mtk_mapping;
@@ -413,14 +412,9 @@ static int mtk_iommu_v1_create_mapping(struct device *dev,
 		return -EINVAL;
 	}
 
-	if (!fwspec) {
-		ret = iommu_fwspec_init(dev, &args->np->fwnode, &mtk_iommu_v1_ops);
-		if (ret)
-			return ret;
-		fwspec = dev_iommu_fwspec_get(dev);
-	} else if (dev_iommu_fwspec_get(dev)->ops != &mtk_iommu_v1_ops) {
-		return -EINVAL;
-	}
+	ret = iommu_fwspec_init(dev, &args->np->fwnode, &mtk_iommu_v1_ops);
+	if (ret)
+		return ret;
 
 	if (!dev_iommu_priv_get(dev)) {
 		/* Get the m4u device */
-- 
2.39.2.101.g768bb238c484.dirty