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| author |   Niklas Schnelle <schnelle@linux.ibm.com> | 2021-09-08 10:18:48 +0200 |
|---|---|---|
| committer |   Jason Gunthorpe <jgg@nvidia.com> | 2021-09-08 08:31:10 -0300 |
| commit | 9660dcbe0d9186976917c94bce4e69dbd8d7a974 (patch) | |
| tree | e318ecbc567f8ac56b53d71e71bc167461eca579 /drivers/infiniband/hw | |
| parent | Merge branch 'sg_nents' into rdma.git for-next (diff) | |
| download | linux-dev-9660dcbe0d9186976917c94bce4e69dbd8d7a974.tar.xz linux-dev-9660dcbe0d9186976917c94bce4e69dbd8d7a974.zip | |
RDMA/mlx5: Fix number of allocated XLT entries
In commit 8010d74b9965b ("RDMA/mlx5: Split the WR setup out of
mlx5_ib_update_xlt()") the allocation logic was split out of
mlx5_ib_update_xlt() and the logic was changed to enable better OOM
handling. Sadly this change introduced a miscalculation of the number of
entries that were actually allocated when under memory pressure where it
can actually become 0 which on s390 lets dma_map_single() fail.
It can also lead to corruption of the free pages list when the wrong
number of entries is used in the calculation of sg->length which is used
as argument for free_pages().
Fix this by using the allocation size instead of misusing get_order(size).
Cc: stable@vger.kernel.org
Fixes: 8010d74b9965 ("RDMA/mlx5: Split the WR setup out of mlx5_ib_update_xlt()")
Link: https://lore.kernel.org/r/20210908081849.7948-1-schnelle@linux.ibm.com
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'drivers/infiniband/hw')
| -rw-r--r-- | drivers/infiniband/hw/mlx5/mr.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c index a520ac8ab68c..b2dd1173c98a 100644 --- a/drivers/infiniband/hw/mlx5/mr.c +++ b/drivers/infiniband/hw/mlx5/mr.c @@ -1024,7 +1024,7 @@ static void *mlx5_ib_alloc_xlt(size_t *nents, size_t ent_size, gfp_t gfp_mask) if (size > MLX5_SPARE_UMR_CHUNK) { size = MLX5_SPARE_UMR_CHUNK; - *nents = get_order(size) / ent_size; + *nents = size / ent_size; res = (void *)__get_free_pages(gfp_mask | __GFP_NOWARN, get_order(size)); if (res) |