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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Logan Gunthorpe <logang@deltatee.com>,
        Allen Hubbe <allenbh@gmail.com>,
        Alexander Fomichev <fomichev.ru@gmail.com>,
        Jon Mason <jdmason@kudzu.us>, Sasha Levin <sashal@kernel.org>,
        linux-ntb@googlegroups.com
Subject: [PATCH AUTOSEL 5.7 351/388] NTB: perf: Don't require one more memory window than number of peers
Date:   Wed, 17 Jun 2020 21:07:28 -0400
Message-Id: <20200618010805.600873-351-sashal@kernel.org>
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From: Logan Gunthorpe <logang@deltatee.com>

[ Upstream commit a9c4211ac918ade1522aced6b5acfbe824722f7d ]

ntb_perf should not require more than one memory window per peer. This
was probably an off-by-one error.

Fixes: 5648e56d03fa ("NTB: ntb_perf: Add full multi-port NTB API support")
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Allen Hubbe <allenbh@gmail.com>
Tested-by: Alexander Fomichev <fomichev.ru@gmail.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/ntb/test/ntb_perf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c
index 1c93b9f5c73b..21c8a3bac1e0 100644
--- a/drivers/ntb/test/ntb_perf.c
+++ b/drivers/ntb/test/ntb_perf.c
@@ -654,7 +654,7 @@ static int perf_init_service(struct perf_ctx *perf)
 {
 	u64 mask;
 
-	if (ntb_peer_mw_count(perf->ntb) < perf->pcnt + 1) {
+	if (ntb_peer_mw_count(perf->ntb) < perf->pcnt) {
 		dev_err(&perf->ntb->dev, "Not enough memory windows\n");
 		return -EINVAL;
 	}
-- 
2.25.1