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dma-mapping: Check for valid IOVA address

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We might fail in alloc_iova if we run out
of virtual addresses in pool. Currently,
if we fail in alloc_iova we are not checking
for return value and directly going ahead
and mapping invalid IOVA address. Fix this
by explicitly checking for return value
from alloc_iova.

Change-Id: I7681d13b75f47a86f0b0b6cbf4b8405a7528ff66
Signed-off-by: Susheel Khiani <skhiani@codeaurora.org>
This commit is contained in:
Susheel Khiani 2015-12-15 16:47:56 +05:30 • committed by David Keitel
parent 06ae5fe9fc
commit ece4a53416
1 changed files with 6 additions and 0 deletions
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6
arch/arm/mm/dma-mapping.c
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@ -1738,6 +1738,12 @@ int arm_iommu_map_sg(struct device *dev, struct scatterlist *sg,
total_length += s->length;
iova = __alloc_iova(mapping, total_length);
if (iova == DMA_ERROR_CODE) {
dev_err(dev, "Couldn't allocate iova for sg %p\n", sg);
return 0;
}
ret = iommu_map_sg(mapping->domain, iova, sg, nents, prot);
if (ret != total_length) {
__free_iova(mapping, iova, total_length);