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    Subject[PATCH 5.13 682/800] iommu/dma: Fix IOVA reserve dma ranges
    Date
    From: Srinath Mannam <srinath.mannam@broadcom.com>

    [ Upstream commit 571f316074a203e979ea90211d9acf423dfe5f46 ]

    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@broadcom.com>
    Reviewed-by: Robin Murphy <robin.murphy@arm.com>
    Tested-by: Sven Peter <sven@svenpeter.dev>
    Link: https://lore.kernel.org/r/20200914072319.6091-1-srinath.mannam@broadcom.com
    Signed-off-by: Joerg Roedel <jroedel@suse.de>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/iommu/dma-iommu.c | 6 ++++--
    1 file changed, 4 insertions(+), 2 deletions(-)

    diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
    index 7bcdd1205535..95e7349ac3f1 100644
    --- a/drivers/iommu/dma-iommu.c
    +++ b/drivers/iommu/dma-iommu.c
    @@ -243,9 +243,11 @@ resv_iova:
    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");
    + dev_err(&dev->dev,
    + "Failed to reserve IOVA [%#010llx-%#010llx]\n",
    + start, end);
    return -EINVAL;
    }

    --
    2.30.2


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