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iommu/dma: Fix IOVA reserve dma ranges

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[ 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: aadad097cd ("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>
This commit is contained in:
Srinath Mannam
2020-09-14 12:53:19 +05:30
committed by Greg Kroah-Hartman
parent ad73683815
commit 45a3d00eaf
1 changed files with 4 additions and 2 deletions
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6
drivers/iommu/dma-iommu.c
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@@ -216,9 +216,11 @@ resv_iova:
lo = iova_pfn(iovad, start); lo = iova_pfn(iovad, start);
hi = iova_pfn(iovad, end); hi = iova_pfn(iovad, end);
reserve_iova(iovad, lo, hi); reserve_iova(iovad, lo, hi);
} else { } else if (end < start) {
/* dma_ranges list should be sorted */ /* 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; return -EINVAL;
} }