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RDMA/mlx5: Do not allow rereg of a ODP MR 

This code is completely broken, the umem of a ODP MR simply cannot be
discarded without a lot more locking, nor can an ODP mkey be blithely
destroyed via destroy_mkey().

Fixes: 6aec21f6a8 ("IB/mlx5: Page faults handling infrastructure")
Link: https://lore.kernel.org/r/20191001153821.23621-2-jgg@ziepe.ca
Reviewed-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Jason Gunthorpe 2019-10-01 12:38:16 -03:00
parent 1cbe866cbc
commit 880505cfef
1 changed files with 3 additions and 3 deletions
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6
drivers/infiniband/hw/mlx5/mr.c
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@ -1441,6 +1441,9 @@ int mlx5_ib_rereg_user_mr(struct ib_mr *ib_mr, int flags, u64 start,
if (!mr->umem)
return -EINVAL;
if (is_odp_mr(mr))
return -EOPNOTSUPP;
if (flags & IB_MR_REREG_TRANS) {
addr = virt_addr;
len = length;
@ -1486,8 +1489,6 @@ int mlx5_ib_rereg_user_mr(struct ib_mr *ib_mr, int flags, u64 start,
}
mr->allocated_from_cache = 0;
if (IS_ENABLED(CONFIG_INFINIBAND_ON_DEMAND_PAGING))
mr->live = 1;
} else {
/*
* Send a UMR WQE
@ -1516,7 +1517,6 @@ int mlx5_ib_rereg_user_mr(struct ib_mr *ib_mr, int flags, u64 start,
set_mr_fields(dev, mr, npages, len, access_flags);
update_odp_mr(mr);
return 0;
err: