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| author | Logan Gunthorpe <logang@deltatee.com> | 2021-10-13 10:59:42 -0600 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2021-10-13 15:26:41 -0300 |
| commit | ac0fffa0859b8e1e991939663b3ebdd80bf979e6 (patch) | |
| tree | b938e42a3c47bf5c499d88948ce0f7a316e7bcc0 /include/rdma | |
| parent | 3b87e0824272414cec79763afef6720c7c908c44 (diff) | |
| download | lwn-ac0fffa0859b8e1e991939663b3ebdd80bf979e6.tar.gz lwn-ac0fffa0859b8e1e991939663b3ebdd80bf979e6.zip | |
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: 79fbd3e1241c ("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>
Diffstat (limited to 'include/rdma')
| -rw-r--r-- | include/rdma/ib_verbs.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index 7688720411a3..61c73adccbbd 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -4105,8 +4105,13 @@ static inline int ib_dma_map_sgtable_attrs(struct ib_device *dev, enum dma_data_direction direction, unsigned long dma_attrs) { + int nents; + 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 dma_map_sgtable(dev->dma_device, sgt, direction, dma_attrs); |