[PATCH rdma-next 1/3] RDMA/core: Preserve the selected source GID on failed AH modification

[Leon Romanovsky <leon@kernel.org>]

From: Leon Romanovsky <leonro@nvidia.com>

When an address-handle modification fails, the core replaces its source-GID
reference. The old address then loses the reference which keeps its source
entry alive.

Fixes: 1a1f460ff151 ("RDMA: Hold the sgid_attr inside the struct ib_ah/qp")
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
 drivers/infiniband/core/verbs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index edf62652f9d3..7d52d3036208 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -1011,7 +1011,8 @@ int rdma_modify_ah(struct ib_ah *ah, struct rdma_ah_attr *ah_attr)
 		ah->device->ops.modify_ah(ah, ah_attr) :
 		-EOPNOTSUPP;
 
-	ah->sgid_attr = rdma_update_sgid_attr(ah_attr, ah->sgid_attr);
+	if (!ret)
+		ah->sgid_attr = rdma_update_sgid_attr(ah_attr, ah->sgid_attr);
 	rdma_unfill_sgid_attr(ah_attr, old_sgid_attr);
 	return ret;
 }

-- 
2.55.0