linux-kernel - [PATCH] ACPI: bus: Fix osc_sb_cppc_not

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Date:   Fri, 24 Jun 2022 07:59:40 -0400
From:   Perry Yuan <Perry.Yuan@....com>
To:     <Ray.Huang@....com>, <Mario.Limonciello@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, Huang Rui <ray.huang@....com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <Nathan.Fontenot@....com>, <Jinzhou.Su@....com>,
        <Xinmei.Huang@....com>, <Xiaojian.Du@....com>, <Li.Meng@....com>,
        <linux-pm@...r.kernel.org>, "Perry Yuan" <Perry.Yuan@....com>
Subject: [PATCH] ACPI: bus: Fix osc_sb_cppc_not_supported check

The patch fixs the osc_sb_cppc_not_supported variable checking
Otherwise the cppc acpi driver will be failed to register causing AMD
pstate driver failed to load when calling acpi_cpc_valid()

Fixes: c42fa24b447("ACPI: bus: Avoid using CPPC if not supported by firmware")
Signed-off-by: Perry Yuan <Perry.Yuan@....com>
---
 drivers/acpi/bus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 4d7c51a33b01..9731e4a1e338 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -359,7 +359,7 @@ static void acpi_bus_osc_negotiate_platform_control(void)
 	}
 
 #ifdef CONFIG_ACPI_CPPC_LIB
-	osc_sb_cppc_not_supported = !(capbuf_ret[OSC_SUPPORT_DWORD] &
+	osc_sb_cppc_not_supported = !(capbuf_ret[OSC_SUPPORT_DWORD] &&
 			(OSC_SB_CPC_SUPPORT | OSC_SB_CPCV2_SUPPORT));
 #endif
 
-- 
2.25.1