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RDMA/core: Set sgtable nents when using ib_dma_virt_map_sg()

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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>
This commit is contained in:
Logan Gunthorpe 2021-10-13 10:59:42 -06:00 committed by Jason Gunthorpe
parent 3b87e08242
commit ac0fffa085
1 changed files with 6 additions and 1 deletions
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7
include/rdma/ib_verbs.h
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@ -4105,8 +4105,13 @@ static inline int ib_dma_map_sgtable_attrs(struct ib_device *dev,
enum dma_data_direction direction, enum dma_data_direction direction,
unsigned long dma_attrs) unsigned long dma_attrs)
{ {
int nents;
if (ib_uses_virt_dma(dev)) { if (ib_uses_virt_dma(dev)) {
ib_dma_virt_map_sg(dev, sgt->sgl, sgt->orig_nents); nents = ib_dma_virt_map_sg(dev, sgt->sgl, sgt->orig_nents);
if (!nents)
return -EIO;
sgt->nents = nents;
return 0; return 0;
} }
return dma_map_sgtable(dev->dma_device, sgt, direction, dma_attrs); return dma_map_sgtable(dev->dma_device, sgt, direction, dma_attrs);