linux-kernel - [PATCH AUTOSEL for 4.9 08/50] EDAC, amd64: Add x86cpuid sanity check during init

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Message-ID: <20171025015539.24525-8-alexander.levin@verizon.com>
Date:   Wed, 25 Oct 2017 01:55:54 +0000
From:   "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Yazen Ghannam <Yazen.Ghannam@....com>,
        linux-edac <linux-edac@...r.kernel.org>,
        Borislav Petkov <bp@...e.de>,
        "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
Subject: [PATCH AUTOSEL for 4.9 08/50] EDAC, amd64: Add x86cpuid sanity check
 during init

From: Yazen Ghannam <Yazen.Ghannam@....com>

[ Upstream commit 1bd9900b8301fc505f032c90ea487824cf824e99 ]

Match one of the devices in amd64_cpuids[] before loading the module.
This is an additional sanity check against users trying to load
amd64_edac_mod on unsupported systems.

Signed-off-by: Yazen Ghannam <Yazen.Ghannam@....com>
Cc: linux-edac <linux-edac@...r.kernel.org>
Link: http://lkml.kernel.org/r/1485537863-2707-9-git-send-email-Yazen.Ghannam@amd.com
[ Get rid of err_ret label, make it a bit more readable this way. ]
Signed-off-by: Borislav Petkov <bp@...e.de>

Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/edac/amd64_edac.c | 6 ++++--
 drivers/edac/amd64_edac.h | 1 +
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index ee181c53626f..431e5d7de215 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -2984,8 +2984,11 @@ static int __init amd64_edac_init(void)
 	int err = -ENODEV;
 	int i;
 
+	if (!x86_match_cpu(amd64_cpuids))
+		return -ENODEV;
+
 	if (amd_cache_northbridges() < 0)
-		goto err_ret;
+		return -ENODEV;
 
 	opstate_init();
 
@@ -3025,7 +3028,6 @@ err_free:
 	kfree(ecc_stngs);
 	ecc_stngs = NULL;
 
-err_ret:
 	return err;
 }
 
diff --git a/drivers/edac/amd64_edac.h b/drivers/edac/amd64_edac.h
index c08870479054..dcb5f9481735 100644
--- a/drivers/edac/amd64_edac.h
+++ b/drivers/edac/amd64_edac.h
@@ -16,6 +16,7 @@
 #include <linux/slab.h>
 #include <linux/mmzone.h>
 #include <linux/edac.h>
+#include <asm/cpu_device_id.h>
 #include <asm/msr.h>
 #include "edac_core.h"
 #include "mce_amd.h"
-- 
2.11.0