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RDMA/core: Fix ordering of CQ pool destruction 

rxe will hold a refcount on the IB device as long as CQ objects exist,
this causes destruction of a rxe device to hang if the CQ pool has any
cached CQs since they are being destroyed after the refcount must go to
zero.

Treat the CQ pool like a client and create/destroy it before/after all
other clients. No users of CQ pool can exist past a client remove call.

Link: https://lore.kernel.org/r/e8a240aa-9e9b-3dca-062f-9130b787f29b@acm.org
Fixes: c7ff819aef ("RDMA/core: Introduce shared CQ pool API")
Tested-by: Bart Van Assche <bvanassche@acm.org>
Tested-by: Yi Zhang <yi.zhang@redhat.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Jason Gunthorpe 2020-09-14 15:20:18 -03:00
parent 856deb866d
commit 4aa1615268
1 changed files with 4 additions and 2 deletions
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6
drivers/infiniband/core/device.c
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@ -1285,6 +1285,8 @@ static void disable_device(struct ib_device *device)
remove_client_context(device, cid);
}
ib_cq_pool_destroy(device);
/* Pairs with refcount_set in enable_device */
ib_device_put(device);
wait_for_completion(&device->unreg_completion);
@ -1328,6 +1330,8 @@ static int enable_device_and_get(struct ib_device *device)
goto out;
}
ib_cq_pool_init(device);
down_read(&clients_rwsem);
xa_for_each_marked (&clients, index, client, CLIENT_REGISTERED) {
ret = add_client_context(device, client);
@ -1400,7 +1404,6 @@ int ib_register_device(struct ib_device *device, const char *name)
goto dev_cleanup;
}
ib_cq_pool_init(device);
ret = enable_device_and_get(device);
dev_set_uevent_suppress(&device->dev, false);
/* Mark for userspace that device is ready */
@ -1455,7 +1458,6 @@ static void __ib_unregister_device(struct ib_device *ib_dev)
goto out;
disable_device(ib_dev);
ib_cq_pool_destroy(ib_dev);
/* Expedite removing unregistered pointers from the hash table */
free_netdevs(ib_dev);