linux-kernel - [PATCH] virt: sev-guest: Pass the appropriate argument type to iounmap()

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Date:   Tue, 19 Jul 2022 12:12:52 -0500
From:   Tom Lendacky <thomas.lendacky@....com>
To:     <linux-kernel@...r.kernel.org>, <x86@...nel.org>
CC:     Borislav Petkov <bp@...e.de>, Michael Roth <michael.roth@....com>,
        "Ashish Kalra" <ashish.kalra@....com>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH] virt: sev-guest: Pass the appropriate argument type to iounmap()

Fix a sparse warning in sev_guest_probe() where the wrong argument type is
provided to iounmap().

Reported-by: kernel test robot <lkp@...el.com>
Fixes: fce96cf04430 ("virt: Add SEV-SNP guest driver")
Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
---
 drivers/virt/coco/sev-guest/sev-guest.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/virt/coco/sev-guest/sev-guest.c b/drivers/virt/coco/sev-guest/sev-guest.c
index 90ce16b6e05f..f422f9c58ba7 100644
--- a/drivers/virt/coco/sev-guest/sev-guest.c
+++ b/drivers/virt/coco/sev-guest/sev-guest.c
@@ -632,16 +632,19 @@ static int __init sev_guest_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct snp_guest_dev *snp_dev;
 	struct miscdevice *misc;
+	void __iomem *mapping;
 	int ret;
 
 	if (!dev->platform_data)
 		return -ENODEV;
 
 	data = (struct sev_guest_platform_data *)dev->platform_data;
-	layout = (__force void *)ioremap_encrypted(data->secrets_gpa, PAGE_SIZE);
-	if (!layout)
+	mapping = ioremap_encrypted(data->secrets_gpa, PAGE_SIZE);
+	if (!mapping)
 		return -ENODEV;
 
+	layout = (__force void *)mapping;
+
 	ret = -ENOMEM;
 	snp_dev = devm_kzalloc(&pdev->dev, sizeof(struct snp_guest_dev), GFP_KERNEL);
 	if (!snp_dev)
@@ -706,7 +709,7 @@ static int __init sev_guest_probe(struct platform_device *pdev)
 e_free_request:
 	free_shared_pages(snp_dev->request, sizeof(struct snp_guest_msg));
 e_unmap:
-	iounmap(layout);
+	iounmap(mapping);
 	return ret;
 }
 
-- 
2.36.1