linux-kernel - [PATCH net] net/smc: Make sure the link

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Message-Id: <1636969507-39355-1-git-send-email-guwen@linux.alibaba.com>
Date:   Mon, 15 Nov 2021 17:45:07 +0800
From:   Wen Gu <guwen@...ux.alibaba.com>
To:     kgraul@...ux.ibm.com
Cc:     linux-s390@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, xuanzhuo@...ux.alibaba.com,
        tonylu@...ux.alibaba.com, dust.li@...ux.alibaba.com,
        guwen@...ux.alibaba.com
Subject: [PATCH net] net/smc: Make sure the link_id is unique

The link_id is supposed to be unique, but smcr_next_link_id() doesn't
skip the used link_id as expected. So the patch fixes this.

Fixes: 026c381fb477 ("net/smc: introduce link_idx for link group array")
Signed-off-by: Wen Gu <guwen@...ux.alibaba.com>
Reviewed-by: Tony Lu <tonylu@...ux.alibaba.com>
---
 net/smc/smc_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index 49b8ba3..25ebd30 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -708,13 +708,14 @@ static u8 smcr_next_link_id(struct smc_link_group *lgr)
 	int i;
 
 	while (1) {
+again:
 		link_id = ++lgr->next_link_id;
 		if (!link_id)	/* skip zero as link_id */
 			link_id = ++lgr->next_link_id;
 		for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 			if (smc_link_usable(&lgr->lnk[i]) &&
 			    lgr->lnk[i].link_id == link_id)
-				continue;
+				goto again;
 		}
 		break;
 	}
-- 
1.8.3.1