diff options
| author | Leon Romanovsky <leonro@mellanox.com> | 2018-10-02 11:48:03 +0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2018-10-05 16:07:39 -0600 |
| commit | ed7a01fd3fd77f40b4ef2562b966a5decd8928d2 (patch) | |
| tree | f8d97bcf113c3b66db0d88632334cfc55d7ef9f4 /drivers/infiniband/core/restrack.c | |
| parent | 2165fc264079ecb7fbfa5e8b330a92eb3f0fcbe1 (diff) | |
RDMA/restrack: Release task struct which was hold by CM_ID object
Tracking CM_ID resource is performed in two stages: creation of cm_id
and connecting it to the cma_dev. It is needed because rdma-cm protocol
exports two separate user-visible calls rdma_create_id and rdma_accept.
At the time of CM_ID creation, the real owner of that object is unknown
yet and we need to grab task_struct. This task_struct is released or
reassigned in attach phase later on. but call to rdma_destroy_id left
this task_struct unreleased.
Such separation is unique to CM_ID and other restrack objects initialize
in one shot. It means that it is safe to use "res->valid" check to catch
unfinished CM_ID flow and release task_struct for that object.
Fixes: 00313983cda6 ("RDMA/nldev: provide detailed CM_ID information")
Reported-by: Artemy Kovalyov <artemyko@mellanox.com>
Reviewed-by: Artemy Kovalyov <artemyko@mellanox.com>
Reviewed-by: Yossi Itigin <yosefe@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'drivers/infiniband/core/restrack.c')
| -rw-r--r-- | drivers/infiniband/core/restrack.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/infiniband/core/restrack.c b/drivers/infiniband/core/restrack.c index 035af568ba64..16b5f9949770 100644 --- a/drivers/infiniband/core/restrack.c +++ b/drivers/infiniband/core/restrack.c @@ -223,7 +223,7 @@ void rdma_restrack_del(struct rdma_restrack_entry *res) struct ib_device *dev; if (!res->valid) - return; + goto out; dev = res_to_dev(res); if (!dev) @@ -236,8 +236,10 @@ void rdma_restrack_del(struct rdma_restrack_entry *res) down_write(&dev->res.rwsem); hash_del(&res->node); res->valid = false; + up_write(&dev->res.rwsem); + +out: if (res->task) put_task_struct(res->task); - up_write(&dev->res.rwsem); } EXPORT_SYMBOL(rdma_restrack_del); |