RDMA/rtrs-srv: Jump to dereg_mr label if allocate iu fails

stable inclusion
from stable-5.10.26
commit 9e97c211b7010f6170e54df1a80e53f6d7f22f77
bugzilla: 51363

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

[ Upstream commit f77c4839 ]

The rtrs_iu_free is called in rtrs_iu_alloc if memory is limited, so we
don't need to free the same iu again.

Fixes: 9cb83748 ("RDMA/rtrs: server: main functionality")
Link: https://lore.kernel.org/r/20201217141915.56989-7-jinpu.wang@cloud.ionos.comSigned-off-by: NGuoqing Jiang <guoqing.jiang@cloud.ionos.com>
Reviewed-by: NGioh Kim <gi-oh.kim@cloud.ionos.com>
Signed-off-by: NJack Wang <jinpu.wang@cloud.ionos.com>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: N  Weilong Chen <chenweilong@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/infiniband/ulp/rtrs/rtrs-srv.c

@@ -671,7 +671,7 @@ static int map_cont_bufs(struct rtrs_srv_sess *sess)
 			if (!srv_mr->iu) {
 				err = -ENOMEM;
 				rtrs_err(ss, "rtrs_iu_alloc(), err: %d\n", err);
-				goto free_iu;
+				goto dereg_mr;
 			}
 		}
 		/* Eventually dma addr for each chunk can be cached */
@@ -687,7 +687,6 @@ static int map_cont_bufs(struct rtrs_srv_sess *sess)
 			srv_mr = &sess->mrs[mri];
 			sgt = &srv_mr->sgt;
 			mr = srv_mr->mr;
-free_iu:
 			rtrs_iu_free(srv_mr->iu, sess->s.dev->ib_dev, 1);
 dereg_mr:
 			ib_dereg_mr(mr);