linux-kernel - [PATCH v2] iommu/dma: Fix IOVA reserve dma ranges

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Message-Id: <20200911102534.25218-1-srinath.mannam@broadcom.com>
Date:   Fri, 11 Sep 2020 15:55:34 +0530
From:   Srinath Mannam <srinath.mannam@...adcom.com>
To:     Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, poza@...eaurora.org
Cc:     bcm-kernel-feedback-list@...adcom.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Srinath Mannam <srinath.mannam@...adcom.com>
Subject: [PATCH v2] iommu/dma: Fix IOVA reserve dma ranges

Fix IOVA reserve failure in the case when address of first memory region
listed in dma-ranges is equal to 0x0.

Fixes: aadad097cd46f ("iommu/dma: Reserve IOVA for PCIe inaccessible DMA address")
Signed-off-by: Srinath Mannam <srinath.mannam@...adcom.com>
---
Changes from v1:
   Removed unnecessary changes based on Robin's review comments.

 drivers/iommu/dma-iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 5141d49a046b..682068a9aae7 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -217,7 +217,7 @@ static int iova_reserve_pci_windows(struct pci_dev *dev,
 			lo = iova_pfn(iovad, start);
 			hi = iova_pfn(iovad, end);
 			reserve_iova(iovad, lo, hi);
-		} else {
+		} else if (end < start) {
 			/* dma_ranges list should be sorted */
 			dev_err(&dev->dev, "Failed to reserve IOVA\n");
 			return -EINVAL;
-- 
2.17.1