netdev - [PATCH] net: stmmac: fix return value of _

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Date:   Wed, 23 Feb 2022 19:35:36 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     netdev@...r.kernel.org
Cc:     patches@...ts.linux.dev, Randy Dunlap <rdunlap@...radead.org>,
        Igor Zhbanov <i.zhbanov@...russia.ru>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH] net: stmmac: fix return value of __setup handler

__setup() handlers should return 1 on success, i.e., the parameter
has been handled. A return of 0 causes the "option=value" string to be
added to init's environment strings, polluting it.

Fixes: 47dd7a540b8a ("net: add support for STMicroelectronics Ethernet controllers.")
Fixes: f3240e2811f0 ("stmmac: remove warning when compile as built-in (V2)")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Reported-by: Igor Zhbanov <i.zhbanov@...russia.ru>
Link: lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@...russia.ru
Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>
Cc: Jose Abreu <joabreu@...opsys.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Jakub Kicinski <kuba@...nel.org>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- linux-next-20220223.orig/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ linux-next-20220223/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -7414,7 +7414,7 @@ static int __init stmmac_cmdline_opt(cha
 	char *opt;
 
 	if (!str || !*str)
-		return -EINVAL;
+		return 1;
 	while ((opt = strsep(&str, ",")) != NULL) {
 		if (!strncmp(opt, "debug:", 6)) {
 			if (kstrtoint(opt + 6, 0, &debug))
@@ -7445,11 +7445,11 @@ static int __init stmmac_cmdline_opt(cha
 				goto err;
 		}
 	}
-	return 0;
+	return 1;
 
 err:
 	pr_err("%s: ERROR broken module parameter conversion", __func__);
-	return -EINVAL;
+	return 1;
 }
 
 __setup("stmmaceth=", stmmac_cmdline_opt);