linux-kernel - [PATCH AUTOSEL 6.6 5/8] ARM: sun9i: smp: fix return code check of of_property_match

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Date: Mon,  8 Jan 2024 07:27:21 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Stefan Wahren <wahrenst@....net>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Chen-Yu Tsai <wens@...e.org>,
	Arnd Bergmann <arnd@...db.de>,
	Sasha Levin <sashal@...nel.org>,
	linux@...linux.org.uk,
	jernej.skrabec@...il.com,
	samuel@...lland.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev
Subject: [PATCH AUTOSEL 6.6 5/8] ARM: sun9i: smp: fix return code check of of_property_match_string

From: Stefan Wahren <wahrenst@....net>

[ Upstream commit 643fe70e7bcdcc9e2d96952f7fc2bab56385cce5 ]

of_property_match_string returns an int; either an index from 0 or
greater if successful or negative on failure. Even it's very
unlikely that the DT CPU node contains multiple enable-methods
these checks should be fixed.

This patch was inspired by the work of Nick Desaulniers.

Link: https://lore.kernel.org/lkml/20230516-sunxi-v1-1-ac4b9651a8c1@google.com/T/
Cc: Nick Desaulniers <ndesaulniers@...gle.com>
Signed-off-by: Stefan Wahren <wahrenst@....net>
Link: https://lore.kernel.org/r/20231228193903.9078-2-wahrenst@gmx.net
Reviewed-by: Chen-Yu Tsai <wens@...e.org>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/arm/mach-sunxi/mc_smp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-sunxi/mc_smp.c b/arch/arm/mach-sunxi/mc_smp.c
index cb63921232a6f..a0e38050e7fad 100644
--- a/arch/arm/mach-sunxi/mc_smp.c
+++ b/arch/arm/mach-sunxi/mc_smp.c
@@ -803,14 +803,14 @@ static int __init sunxi_mc_smp_init(void)
 	for (i = 0; i < ARRAY_SIZE(sunxi_mc_smp_data); i++) {
 		ret = of_property_match_string(node, "enable-method",
 					       sunxi_mc_smp_data[i].enable_method);
-		if (!ret)
+		if (ret >= 0)
 			break;
 	}
 
 	is_a83t = sunxi_mc_smp_data[i].is_a83t;
 
 	of_node_put(node);
-	if (ret)
+	if (ret < 0)
 		return -ENODEV;
 
 	if (!sunxi_mc_smp_cpu_table_init())
-- 
2.43.0