net/smc: Scan from current RMB list when no position specified

JIRA: https://issues.redhat.com/browse/RHEL-73484

commit b24aa14
Author: Wen Gu <guwen@linux.alibaba.com>
Date:   Fri May 26 19:49:00 2023 +0800

    net/smc: Scan from current RMB list when no position specified

    When finding the first RMB of link group, it should start from the
    current RMB list whose index is 0. So fix it.

    Fixes: b4ba465 ("net/smc: extend LLC layer for SMC-Rv2")
    Signed-off-by: Wen Gu <guwen@linux.alibaba.com>
    Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Signed-off-by: Mete Durlu <mdurlu@redhat.com>

Author: Mete Durlu

net/smc/smc_llc.c

@@ -578,7 +578,10 @@ static struct smc_buf_desc *smc_llc_get_next_rmb(struct smc_link_group *lgr,
 {
 	struct smc_buf_desc *buf_next;
 
-	if (!buf_pos || list_is_last(&buf_pos->list, &lgr->rmbs[*buf_lst])) {
+	if (!buf_pos)
+		return _smc_llc_get_next_rmb(lgr, buf_lst);
+
+	if (list_is_last(&buf_pos->list, &lgr->rmbs[*buf_lst])) {
 		(*buf_lst)++;
 		return _smc_llc_get_next_rmb(lgr, buf_lst);
 	}