From: Greg Kroah-Hartman
Date: Sat Aug 08 2015 - 18:19:38 EST

4.1-stable review patch. If anyone has any objections, please let me know.


From: Jason Gunthorpe <jgunthorpe@xxxxxxxxxxxxxxxxxxxx>

commit efc1eedbf63a194b3b576fc25776f3f1fa55a4d4 upstream.

If the above is turned off then ipoib_cm_dev_init unconditionally
returns ENOSYS, and the newly added error handling in
0b3957 prevents ipoib from coming up at all:

kernel: mlx4_0: ipoib_transport_dev_init failed
kernel: mlx4_0: failed to initialize port 1 (ret = -12)

Fixes: 0b39578bcde4 (IB/ipoib: Use dedicated workqueues per interface)
Signed-off-by: Jason Gunthorpe <jgunthorpe@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/infiniband/ulp/ipoib/ipoib_verbs.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/infiniband/ulp/ipoib/ipoib_verbs.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_verbs.c
@@ -176,7 +176,8 @@ int ipoib_transport_dev_init(struct net_
size += ipoib_recvq_size * ipoib_max_conn_qp;
} else
- goto out_free_wq;
+ if (ret != -ENOSYS)
+ goto out_free_wq;

priv->recv_cq = ib_create_cq(priv->ca, ipoib_ib_completion, NULL, dev, size, 0);
if (IS_ERR(priv->recv_cq)) {

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