linux-kernel - [PATCH 4.9 39/77] cpufreq: powernv: Dont assume distinct pstate values for nominal and pmin

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20180221124433.818164950@linuxfoundation.org>
Date:   Wed, 21 Feb 2018 13:48:48 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alvin Wang <wangat@...ibm.com>,
        Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 4.9 39/77] cpufreq: powernv: Dont assume distinct pstate values for nominal and pmin

4.9-stable review patch.  If anyone has any objections, please let me know.

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

From: Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>

commit 3fa4680b860bf48b437d6a2c039789c4abe202ae upstream.

Some OpenPOWER boxes can have same pstate values for nominal and
pmin pstates. In these boxes the current code will not initialize
'powernv_pstate_info.min' variable and result in erroneous CPU
frequency reporting. This patch fixes this problem.

Fixes: 09ca4c9b5958 (cpufreq: powernv: Replacing pstate_id with frequency table index)
Reported-by: Alvin Wang <wangat@...ibm.com>
Signed-off-by: Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
Cc: 4.8+ <stable@...r.kernel.org> # 4.8+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/cpufreq/powernv-cpufreq.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/cpufreq/powernv-cpufreq.c
+++ b/drivers/cpufreq/powernv-cpufreq.c
@@ -260,9 +260,9 @@ static int init_powernv_pstates(void)

 		if (id == pstate_max)
 			powernv_pstate_info.max = i;
-		else if (id == pstate_nominal)
+		if (id == pstate_nominal)
 			powernv_pstate_info.nominal = i;
-		else if (id == pstate_min)
+		if (id == pstate_min)
 			powernv_pstate_info.min = i;
 	}