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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,
        =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= 
        <ville.syrjala@linux.intel.com>,
        Woody Suwalski <wsuwalski@gmail.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Subject: [PATCH 5.15 140/177] Revert "ACPI: processor: idle: fix lockup regression on 32-bit ThinkPad T40"
Date:   Wed,  4 May 2022 18:45:33 +0200
Message-Id: <20220504153105.772291535@linuxfoundation.org>
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From: Ville Syrjälä <ville.syrjala@linux.intel.com>

commit 20e582e16af24b074e583f9551fad557882a3c9d upstream.

This reverts commit bfe55a1f7fd6bfede16078bf04c6250fbca11588.

This was presumably misdiagnosed as an inability to use C3 at
all when I suspect the real problem is just misconfiguration of
C3 vs. ARB_DIS.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: 5.16+ <stable@vger.kernel.org> # 5.16+
Tested-by: Woody Suwalski <wsuwalski@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/acpi/processor_idle.c |    5 -----
 1 file changed, 5 deletions(-)

--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -95,11 +95,6 @@ static const struct dmi_system_id proces
 	  DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 	  DMI_MATCH(DMI_PRODUCT_NAME,"L8400B series Notebook PC")},
 	 (void *)1},
-	/* T40 can not handle C3 idle state */
-	{ set_max_cstate, "IBM ThinkPad T40", {
-	  DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
-	  DMI_MATCH(DMI_PRODUCT_NAME, "23737CU")},
-	 (void *)2},
 	{},
 };