linux-kernel - [PATCH 3.16 150/178] cpupower: Fix turbo frequency reporting for pre-Sandy Bridge cores

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Message-ID: <lsq.1500213406.374446698@decadent.org.uk>
Date:   Sun, 16 Jul 2017 14:56:46 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        "GSR" <gsr.bugs@...ernal-iceberg.com>
Subject: [PATCH 3.16 150/178] cpupower: Fix turbo frequency reporting for
 pre-Sandy Bridge cores

3.16.46-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Hutchings <ben@...adent.org.uk>

commit 4cca0457686e4ee1677d69469e4ddfd94d389a80 upstream.

The switch that conditionally sets CPUPOWER_CAP_HAS_TURBO_RATIO and
CPUPOWER_CAP_IS_SNB flags is missing a break, so all cores get both
flags set and an assumed base clock of 100 MHz for turbo values.

Reported-by: GSR <gsr.bugs@...ernal-iceberg.com>
Tested-by: GSR <gsr.bugs@...ernal-iceberg.com>
References: https://bugs.debian.org/859978
Fixes: 8fb2e440b223 (cpupower: Show Intel turbo ratio support via ...)
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 tools/power/cpupower/utils/helpers/cpuid.c | 1 +
 1 file changed, 1 insertion(+)

--- a/tools/power/cpupower/utils/helpers/cpuid.c
+++ b/tools/power/cpupower/utils/helpers/cpuid.c
@@ -156,6 +156,7 @@ out:
 					 */
 			case 0x2C:	/* Westmere EP - Gulftown */
 				cpu_info->caps |= CPUPOWER_CAP_HAS_TURBO_RATIO;
+				break;
 			case 0x2A:	/* SNB */
 			case 0x2D:	/* SNB Xeon */
 			case 0x3A:	/* IVB */