linux-kernel - [PATCH] iommu/arm-smmu-v3: Fix a NULL vs IS

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Message-ID: <9208cd0d-8105-40df-93e9-bdcdf0d55eec@stanley.mountain>
Date: Thu, 15 Aug 2024 14:25:00 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
Cc: Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
	Joerg Roedel <joro@...tes.org>, Jason Gunthorpe <jgg@...pe.ca>,
	Nicolin Chen <nicolinc@...dia.com>,
	Michael Shavit <mshavit@...gle.com>,
	Mostafa Saleh <smostafa@...gle.com>,
	Lu Baolu <baolu.lu@...ux.intel.com>,
	Kevin Tian <kevin.tian@...el.com>,
	linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] iommu/arm-smmu-v3: Fix a NULL vs IS_ERR() check

The arm_smmu_domain_alloc() function returns error pointers on error.  It
doesn't return NULL.  Update the error checking to match.

Fixes: 52acd7d8a413 ("iommu/arm-smmu-v3: Add support for domain_alloc_user fn")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 9bc50bded5af..cf21d7d2e737 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3062,8 +3062,8 @@ arm_smmu_domain_alloc_user(struct device *dev, u32 flags,
 		return ERR_PTR(-EOPNOTSUPP);
 
 	smmu_domain = arm_smmu_domain_alloc();
-	if (!smmu_domain)
-		return ERR_PTR(-ENOMEM);
+	if (IS_ERR(smmu_domain))
+		return ERR_CAST(smmu_domain);
 
 	smmu_domain->domain.type = IOMMU_DOMAIN_UNMANAGED;
 	smmu_domain->domain.ops = arm_smmu_ops.default_domain_ops;
-- 
2.43.0