[PATCH 5.16 0592/1017] MIPS: RB532: fix return value of __setup handler

From: Greg Kroah-Hartman
Date: Tue Apr 05 2022 - 08:59:53 EST

From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

[ Upstream commit 8755d57ba1ff910666572fab9e32890e8cc6ed3b ]

__setup() handlers should return 1 to obsolete_checksetup() in
init/main.c to indicate that the boot option has been handled.
A return of 0 causes the boot option/value to be listed as an Unknown
kernel parameter and added to init's (limited) argument or environment
strings. Also, error return codes don't mean anything to
obsolete_checksetup() -- only non-zero (usually 1) or zero.
So return 1 from setup_kmac().

Fixes: 9e21c7e40b7e ("MIPS: RB532: Replace parse_mac_addr() with mac_pton().")
Fixes: 73b4390fb234 ("[MIPS] Routerboard 532: Support for base system")
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
From: Igor Zhbanov <i.zhbanov@xxxxxxxxxxxx>
Link: lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@xxxxxxxxxxxx
Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxxx
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Jakub Kicinski <kuba@xxxxxxxxxx>
Cc: Phil Sutter <n0-1@xxxxxxxxxxx>
Cc: Florian Fainelli <f.fainelli@xxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Daniel Walter <dwalter@xxxxxxxxxx>
Signed-off-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
arch/mips/rb532/devices.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/mips/rb532/devices.c b/arch/mips/rb532/devices.c
index 04684990e28e..b7f6f782d9a1 100644
--- a/arch/mips/rb532/devices.c
+++ b/arch/mips/rb532/devices.c
@@ -301,11 +301,9 @@ static int __init plat_setup_devices(void)
static int __init setup_kmac(char *s)
printk(KERN_INFO "korina mac = %s\n", s);
- if (!mac_pton(s, korina_dev0_data.mac)) {
+ if (!mac_pton(s, korina_dev0_data.mac))
printk(KERN_ERR "Invalid mac\n");
- return -EINVAL;
- }
- return 0;
+ return 1;

__setup("kmac=", setup_kmac);