linux-kernel - [PATCH v2 05/12] iommu: Change the return value of dev_iommu

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Message-Id: <20230727054837.147050-6-baolu.lu@linux.intel.com>
Date:   Thu, 27 Jul 2023 13:48:30 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Kevin Tian <kevin.tian@...el.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Nicolin Chen <nicolinc@...dia.com>
Cc:     Yi Liu <yi.l.liu@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        iommu@...ts.linux.dev, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH v2 05/12] iommu: Change the return value of dev_iommu_get()

Make dev_iommu_get() return 0 for success and error numbers for failure.
This will make the code neat and readable. No functionality changes.

Reviewed-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/iommu.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 00309f66153b..4ba3bb692993 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -290,20 +290,20 @@ void iommu_device_unregister(struct iommu_device *iommu)
 }
 EXPORT_SYMBOL_GPL(iommu_device_unregister);
 
-static struct dev_iommu *dev_iommu_get(struct device *dev)
+static int dev_iommu_get(struct device *dev)
 {
 	struct dev_iommu *param = dev->iommu;
 
 	if (param)
-		return param;
+		return 0;
 
 	param = kzalloc(sizeof(*param), GFP_KERNEL);
 	if (!param)
-		return NULL;
+		return -ENOMEM;
 
 	mutex_init(&param->lock);
 	dev->iommu = param;
-	return param;
+	return 0;
 }
 
 static void dev_iommu_free(struct device *dev)
@@ -346,8 +346,9 @@ static int iommu_init_device(struct device *dev, const struct iommu_ops *ops)
 	struct iommu_group *group;
 	int ret;
 
-	if (!dev_iommu_get(dev))
-		return -ENOMEM;
+	ret = dev_iommu_get(dev);
+	if (ret)
+		return ret;
 
 	if (!try_module_get(ops->owner)) {
 		ret = -EINVAL;
@@ -2743,12 +2744,14 @@ int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
 		      const struct iommu_ops *ops)
 {
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
+	int ret;
 
 	if (fwspec)
 		return ops == fwspec->ops ? 0 : -EINVAL;
 
-	if (!dev_iommu_get(dev))
-		return -ENOMEM;
+	ret = dev_iommu_get(dev);
+	if (ret)
+		return ret;
 
 	/* Preallocate for the overwhelmingly common case of 1 ID */
 	fwspec = kzalloc(struct_size(fwspec, ids, 1), GFP_KERNEL);
-- 
2.34.1