[PATCH] RDMA/rtrs-srv: suppress warnings passing zero to 'PTR_ERR'

[Jack Wang <jinpu.wang@cloud.ionos.com>]

smatch warnings:
drivers/infiniband/ulp/rtrs/rtrs-srv.c:1805 rtrs_rdma_connect() warn: passing zero to 'PTR_ERR'

Smatch seems confused by the refcount_read condition, so just
treat it seperately.

Fixes: f0751419d3a1 ("RDMA/rtrs: Only allow addition of path to an already established session")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
---
 drivers/infiniband/ulp/rtrs/rtrs-srv.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/ulp/rtrs/rtrs-srv.c b/drivers/infiniband/ulp/rtrs/rtrs-srv.c
index eb17c3a08810..2f6d665bea90 100644
--- a/drivers/infiniband/ulp/rtrs/rtrs-srv.c
+++ b/drivers/infiniband/ulp/rtrs/rtrs-srv.c
@@ -1799,12 +1799,16 @@ static int rtrs_rdma_connect(struct rdma_cm_id *cm_id,
 	}
 	recon_cnt = le16_to_cpu(msg->recon_cnt);
 	srv = get_or_create_srv(ctx, &msg->paths_uuid, msg->first_conn);
+	if (IS_ERR(srv)) {
+		err = PTR_ERR(srv);
+		goto reject_w_err;
+	}
 	/*
 	 * "refcount == 0" happens if a previous thread calls get_or_create_srv
 	 * allocate srv, but chunks of srv are not allocated yet.
 	 */
-	if (IS_ERR(srv) || refcount_read(&srv->refcount) == 0) {
-		err = PTR_ERR(srv);
+	if (refcount_read(&srv->refcount) == 0) {
+		err = -EBUSY;
 		goto reject_w_err;
 	}
 	mutex_lock(&srv->paths_mutex);
-- 
2.25.1