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Subject[PATCH 4.14 06/92] xprtrdma: Fix corner cases when handling device removal
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chuck Lever <chuck.lever@oracle.com>

commit 25524288631fc5b7d33259fca1e0dc38146be5d6 upstream.

Michal Kalderon has found some corner cases around device unload
with active NFS mounts that I didn't have the imagination to test
when xprtrdma device removal was added last year.

- The ULP device removal handler is responsible for deallocating
the PD. That wasn't clear to me initially, and my own testing
suggested it was not necessary, but that is incorrect.

- The transport destruction path can no longer assume that there
is a valid ID.

- When destroying a transport, ensure that ib_free_cq() is not
invoked on a CQ that was already released.

Reported-by: Michal Kalderon <Michal.Kalderon@cavium.com>
Fixes: bebd031866ca ("xprtrdma: Support unplugging an HCA from ...")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: stable@vger.kernel.org # v4.12+
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/sunrpc/xprtrdma/verbs.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)

--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -270,7 +270,6 @@ rpcrdma_conn_upcall(struct rdma_cm_id *i
wait_for_completion(&ia->ri_remove_done);

ia->ri_id = NULL;
- ia->ri_pd = NULL;
ia->ri_device = NULL;
/* Return 1 to ensure the core destroys the id. */
return 1;
@@ -464,7 +463,9 @@ rpcrdma_ia_remove(struct rpcrdma_ia *ia)
ia->ri_id->qp = NULL;
}
ib_free_cq(ep->rep_attr.recv_cq);
+ ep->rep_attr.recv_cq = NULL;
ib_free_cq(ep->rep_attr.send_cq);
+ ep->rep_attr.send_cq = NULL;

/* The ULP is responsible for ensuring all DMA
* mappings and MRs are gone.
@@ -477,6 +478,8 @@ rpcrdma_ia_remove(struct rpcrdma_ia *ia)
rpcrdma_dma_unmap_regbuf(req->rl_recvbuf);
}
rpcrdma_destroy_mrs(buf);
+ ib_dealloc_pd(ia->ri_pd);
+ ia->ri_pd = NULL;

/* Allow waiters to continue */
complete(&ia->ri_remove_done);
@@ -650,14 +653,16 @@ rpcrdma_ep_destroy(struct rpcrdma_ep *ep

cancel_delayed_work_sync(&ep->rep_connect_worker);

- if (ia->ri_id->qp) {
+ if (ia->ri_id && ia->ri_id->qp) {
rpcrdma_ep_disconnect(ep, ia);
rdma_destroy_qp(ia->ri_id);
ia->ri_id->qp = NULL;
}

- ib_free_cq(ep->rep_attr.recv_cq);
- ib_free_cq(ep->rep_attr.send_cq);
+ if (ep->rep_attr.recv_cq)
+ ib_free_cq(ep->rep_attr.recv_cq);
+ if (ep->rep_attr.send_cq)
+ ib_free_cq(ep->rep_attr.send_cq);
}

/* Re-establish a connection after a device removal event.

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