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| author |   Jason Gunthorpe <jgg@nvidia.com> | 2020-08-18 15:05:13 +0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2020-08-27 08:38:13 -0300 |
| commit | ca2968c1efcbeb547906cf6211874ec881beafec (patch) | |
| tree | f5d7b5f93d3d2270117006ddb69d56e79a7258a2 /drivers/infiniband/core | |
| parent | IB/mlx5: Add DCT RoCE LAG support (diff) | |
| download | linux-dev-ca2968c1efcbeb547906cf6211874ec881beafec.tar.xz linux-dev-ca2968c1efcbeb547906cf6211874ec881beafec.zip | |
RDMA/ucma: Fix refcount 0 incr in ucma_get_ctx()
Both ucma_destroy_id() and ucma_close_id() (triggered from an event via a
wq) can drive the refcount to zero. ucma_get_ctx() was wrongly assuming
that the refcount can only go to zero from ucma_destroy_id() which also
removes it from the xarray.
Use refcount_inc_not_zero() instead.
Link: https://lore.kernel.org/r/20200818120526.702120-2-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'drivers/infiniband/core')
| -rw-r--r-- | drivers/infiniband/core/ucma.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c index d03dacaef788..625168563443 100644 --- a/drivers/infiniband/core/ucma.c +++ b/drivers/infiniband/core/ucma.c @@ -153,8 +153,8 @@ static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id) if (!IS_ERR(ctx)) { if (ctx->closing) ctx = ERR_PTR(-EIO); - else - refcount_inc(&ctx->ref); + else if (!refcount_inc_not_zero(&ctx->ref)) + ctx = ERR_PTR(-ENXIO); } xa_unlock(&ctx_table); return ctx; |