linux-kernel - [PATCH 5.10 333/545] RDMA/rtrs: Avoid Wtautological-constant-out-of-range-compare

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Message-Id: <20220819153844.289126654@linuxfoundation.org>
Date:   Fri, 19 Aug 2022 17:41:43 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jack Wang <jinpu.wang@...os.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 333/545] RDMA/rtrs: Avoid Wtautological-constant-out-of-range-compare

From: Jack Wang <jinpu.wang@...os.com>

[ Upstream commit 0e8558476faf02ec51256cad9c487c93c346198c ]

drivers/infiniband/ulp/rtrs/rtrs-clt.c:1786:19: warning: result of comparison of
constant 'MAX_SESS_QUEUE_DEPTH' (65536) with expression of type 'u16'
(aka 'unsigned short') is always false [-Wtautological-constant-out-of-range-compare]

To fix it, limit MAX_SESS_QUEUE_DEPTH to u16 max, which is 65535, and
drop the check in rtrs-clt, as it's the type u16 max.

Link: https://lore.kernel.org/r/20210531122835.58329-1-jinpu.wang@ionos.com
Signed-off-by: Jack Wang <jinpu.wang@...os.com>
Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/infiniband/ulp/rtrs/rtrs-clt.c | 5 -----
 drivers/infiniband/ulp/rtrs/rtrs-pri.h | 4 ++--
 2 files changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt.c b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
index 13634eda833d..5c39e4c4bef7 100644
--- a/drivers/infiniband/ulp/rtrs/rtrs-clt.c
+++ b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
@@ -1728,11 +1728,6 @@ static int rtrs_rdma_conn_established(struct rtrs_clt_con *con,
 	if (con->c.cid == 0) {
 		queue_depth = le16_to_cpu(msg->queue_depth);
 
-		if (queue_depth > MAX_SESS_QUEUE_DEPTH) {
-			rtrs_err(clt, "Invalid RTRS message: queue=%d\n",
-				  queue_depth);
-			return -ECONNRESET;
-		}
 		if (sess->queue_depth > 0 && queue_depth != sess->queue_depth) {
 			rtrs_err(clt, "Error: queue depth changed\n");
 
diff --git a/drivers/infiniband/ulp/rtrs/rtrs-pri.h b/drivers/infiniband/ulp/rtrs/rtrs-pri.h
index 333de9d52172..77e98ff9008a 100644
--- a/drivers/infiniband/ulp/rtrs/rtrs-pri.h
+++ b/drivers/infiniband/ulp/rtrs/rtrs-pri.h
@@ -53,9 +53,9 @@ enum {
 	 * But mempool_create, create_qp and ib_post_send fail with
 	 * "cannot allocate memory" error if sess_queue_depth is too big.
 	 * Therefore the pratical max value of sess_queue_depth is
-	 * somewhere between 1 and 65536 and it depends on the system.
+	 * somewhere between 1 and 65534 and it depends on the system.
 	 */
-	MAX_SESS_QUEUE_DEPTH = 65536,
+	MAX_SESS_QUEUE_DEPTH = 65535,
 	MIN_CHUNK_SIZE = 8192,
 
 	RTRS_HB_INTERVAL_MS = 5000,
-- 
2.35.1