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net/smc: Make sure the link_id is unique

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[ Upstream commit cf4f5530bb ]

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: 026c381fb4 ("net/smc: introduce link_idx for link group array")
Signed-off-by: Wen Gu <guwen@linux.alibaba.com>
Reviewed-by: Tony Lu <tonylu@linux.alibaba.com>
Acked-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Wen Gu 2021-11-15 17:45:07 +08:00 committed by Greg Kroah-Hartman
parent 17b2c2e70d
commit f6218db543
1 changed files with 2 additions and 1 deletions
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3
net/smc/smc_core.c
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@ -665,13 +665,14 @@ 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;
}