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RDMA/restrack: Release task struct which was hold by CM_ID object

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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: 00313983cd ("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>
This commit is contained in:
Leon Romanovsky 2018-10-02 11:48:03 +03:00 committed by Jason Gunthorpe
parent 2165fc2640
commit ed7a01fd3f
2 changed files with 7 additions and 6 deletions
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7
drivers/infiniband/core/cma.c
View file

@ -1815,8 +1815,8 @@ void rdma_destroy_id(struct rdma_cm_id *id)
mutex_lock(&id_priv->handler_mutex);
mutex_unlock(&id_priv->handler_mutex);
rdma_restrack_del(&id_priv->res);
if (id_priv->cma_dev) {
rdma_restrack_del(&id_priv->res);
if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
if (id_priv->cm_id.ib)
ib_destroy_cm_id(id_priv->cm_id.ib);
@ -3542,10 +3542,9 @@ int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
return 0;
err2:
if (id_priv->cma_dev) {
rdma_restrack_del(&id_priv->res);
rdma_restrack_del(&id_priv->res);
if (id_priv->cma_dev)
cma_release_dev(id_priv);
}
err1:
cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
return ret;

6
drivers/infiniband/core/restrack.c
View file

@ -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);