linux-kernel - [PATCH][next] iommu/mediatek: Fix unsigned domid comparison with less than zero

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Date:   Wed,  3 Feb 2021 13:59:36 +0000
From:   Colin King <colin.king@...onical.com>
To:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Anan sun <anan.sun@...iatek.com>,
        Yong Wu <yong.wu@...iatek.com>,
        Chao Hao <chao.hao@...iatek.com>,
        Tomasz Figa <tfiga@...omium.org>,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] iommu/mediatek: Fix unsigned domid comparison with less than zero

From: Colin Ian King <colin.king@...onical.com>

Currently the check for domid < 0 is always false because domid
is unsigned.  Fix this by making it signed.

Addresses-CoverityL ("Unsigned comparison against 0")
Fixes: ab1d5281a62b ("iommu/mediatek: Add iova reserved function")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/iommu/mtk_iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 0ad14a7604b1..823d719945b2 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -640,7 +640,7 @@ static void mtk_iommu_get_resv_regions(struct device *dev,
 				       struct list_head *head)
 {
 	struct mtk_iommu_data *data = dev_iommu_priv_get(dev);
-	unsigned int domid = mtk_iommu_get_domain_id(dev, data->plat_data), i;
+	int domid = mtk_iommu_get_domain_id(dev, data->plat_data), i;
 	const struct mtk_iommu_iova_region *resv, *curdom;
 	struct iommu_resv_region *region;
 	int prot = IOMMU_WRITE | IOMMU_READ;
-- 
2.29.2