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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Igor Zhbanov <izh1979@gmail.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.9 070/167] powerpc/4xx/cpm: Fix return value of __setup() handler
Date:   Mon, 13 Jun 2022 12:09:04 +0200
Message-Id: <20220613094857.326994927@linuxfoundation.org>
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From: Randy Dunlap <rdunlap@infradead.org>

[ Upstream commit 5bb99fd4090fe1acfdb90a97993fcda7f8f5a3d6 ]

__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 cpm_powersave_off().

Fixes: d164f6d4f910 ("powerpc/4xx: Add suspend and idle support")
Reported-by: Igor Zhbanov <izh1979@gmail.com>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220502192941.20955-1-rdunlap@infradead.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/powerpc/sysdev/ppc4xx_cpm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/sysdev/ppc4xx_cpm.c b/arch/powerpc/sysdev/ppc4xx_cpm.c
index ba95adf81d8d..05047cf32dbb 100644
--- a/arch/powerpc/sysdev/ppc4xx_cpm.c
+++ b/arch/powerpc/sysdev/ppc4xx_cpm.c
@@ -341,6 +341,6 @@ late_initcall(cpm_init);
 static int __init cpm_powersave_off(char *arg)
 {
 	cpm.powersave_off = 1;
-	return 0;
+	return 1;
 }
 __setup("powersave=off", cpm_powersave_off);
-- 
2.35.1