forked from Minki/linux
RDMA/core: Set sgtable nents when using ib_dma_virt_map_sg()
ib_dma_map_sgtable_attrs() should be mapping the sgls and setting nents
but the ib_uses_virt_dma() path falls back to ib_dma_virt_map_sg() which
will not set the nents in the sgtable.
Check the return value (per the map_sg calling convention) and set
sgt->nents appropriately on success.
Fixes: 79fbd3e124
("RDMA: Use the sg_table directly and remove the opencoded version from umem")
Link: https://lore.kernel.org/r/20211013165942.89806-1-logang@deltatee.com
Reported-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Tested-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
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@ -4105,8 +4105,13 @@ static inline int ib_dma_map_sgtable_attrs(struct ib_device *dev,
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enum dma_data_direction direction,
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unsigned long dma_attrs)
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{
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int nents;
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if (ib_uses_virt_dma(dev)) {
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ib_dma_virt_map_sg(dev, sgt->sgl, sgt->orig_nents);
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nents = ib_dma_virt_map_sg(dev, sgt->sgl, sgt->orig_nents);
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if (!nents)
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return -EIO;
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sgt->nents = nents;
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return 0;
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}
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return dma_map_sgtable(dev->dma_device, sgt, direction, dma_attrs);
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