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RDMA/rw: Fix error flow during RDMA context initialization 

commit 6affca140c upstream.

In case the SGL was mapped for P2P DMA operation, we must unmap it using
pci_p2pdma_unmap_sg during the error unwind of rdma_rw_ctx_init()

Fixes: 7f73eac3a7 ("PCI/P2PDMA: Introduce pci_p2pdma_unmap_sg()")
Link: https://lore.kernel.org/r/20200220100819.41860-1-maxg@mellanox.com
Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Max Gurtovoy 2020-02-20 12:08:18 +02:00 committed by Greg Kroah-Hartman
parent 194f9e8e3d
commit 4a2acf74a8
1 changed files with 20 additions and 11 deletions
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31
drivers/infiniband/core/rw.c
View File

@ -268,6 +268,23 @@ static int rdma_rw_init_single_wr(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
return 1;
}
static void rdma_rw_unmap_sg(struct ib_device *dev, struct scatterlist *sg,
u32 sg_cnt, enum dma_data_direction dir)
{
if (is_pci_p2pdma_page(sg_page(sg)))
pci_p2pdma_unmap_sg(dev->dma_device, sg, sg_cnt, dir);
else
ib_dma_unmap_sg(dev, sg, sg_cnt, dir);
}
static int rdma_rw_map_sg(struct ib_device *dev, struct scatterlist *sg,
u32 sg_cnt, enum dma_data_direction dir)
{
if (is_pci_p2pdma_page(sg_page(sg)))
return pci_p2pdma_map_sg(dev->dma_device, sg, sg_cnt, dir);
return ib_dma_map_sg(dev, sg, sg_cnt, dir);
}
/**
* rdma_rw_ctx_init - initialize a RDMA READ/WRITE context
* @ctx: context to initialize
@ -290,11 +307,7 @@ int rdma_rw_ctx_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num,
struct ib_device *dev = qp->pd->device;
int ret;
if (is_pci_p2pdma_page(sg_page(sg)))
ret = pci_p2pdma_map_sg(dev->dma_device, sg, sg_cnt, dir);
else
ret = ib_dma_map_sg(dev, sg, sg_cnt, dir);
ret = rdma_rw_map_sg(dev, sg, sg_cnt, dir);
if (!ret)
return -ENOMEM;
sg_cnt = ret;
@ -333,7 +346,7 @@ int rdma_rw_ctx_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num,
return ret;
out_unmap_sg:
ib_dma_unmap_sg(dev, sg, sg_cnt, dir);
rdma_rw_unmap_sg(dev, sg, sg_cnt, dir);
return ret;
}
EXPORT_SYMBOL(rdma_rw_ctx_init);
@ -583,11 +596,7 @@ void rdma_rw_ctx_destroy(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num,
break;
}
if (is_pci_p2pdma_page(sg_page(sg)))
pci_p2pdma_unmap_sg(qp->pd->device->dma_device, sg,
sg_cnt, dir);
else
ib_dma_unmap_sg(qp->pd->device, sg, sg_cnt, dir);
rdma_rw_unmap_sg(qp->pd->device, sg, sg_cnt, dir);
}
EXPORT_SYMBOL(rdma_rw_ctx_destroy);