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IB/mlx5: Ensure proper synchronization accessing memory 

Call mlx5_ib_populate_pas() before mapping the DMA buffer to ensure
the hardware reads the values written by the CPU.

Found by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Eli Cohen 2013-09-11 16:35:36 +03:00 committed by Roland Dreier
parent fe45f82704
commit 5431390707
1 changed files with 4 additions and 3 deletions
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7
drivers/infiniband/hw/mlx5/mr.c
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@ -680,6 +680,10 @@ static struct mlx5_ib_mr *reg_umr(struct ib_pd *pd, struct ib_umem *umem,
err = -ENOMEM;
goto error;
}
mlx5_ib_populate_pas(dev, umem, page_shift,
mr_align(mr->pas, MLX5_UMR_ALIGN), 1);
mr->dma = dma_map_single(ddev, mr_align(mr->pas, MLX5_UMR_ALIGN), size,
DMA_TO_DEVICE);
if (dma_mapping_error(ddev, mr->dma)) {
@ -688,9 +692,6 @@ static struct mlx5_ib_mr *reg_umr(struct ib_pd *pd, struct ib_umem *umem,
goto error;
}
mlx5_ib_populate_pas(dev, umem, page_shift,
mr_align(mr->pas, MLX5_UMR_ALIGN), 1);
memset(&wr, 0, sizeof(wr));
wr.wr_id = (u64)(unsigned long)mr;
prep_umr_reg_wqe(pd, &wr, &sg, mr->dma, npages, mr->mmr.key, page_shift, virt_addr, len, access_flags);