linux-kernel - [PATCH v2 2/3] platform/x86/amd/pmf: Do not use readl() for policy buffer access

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Date: Fri, 23 Feb 2024 17:39:00 +0100
From: Armin Wolf <W_Armin@....de>
To: Shyam-sundar.S-k@....com,
	mika.westerberg@...ux.intel.com
Cc: sathyanarayanan.kuppuswamy@...ux.intel.com,
	hdegoede@...hat.com,
	ilpo.jarvinen@...ux.intel.com,
	platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/3] platform/x86/amd/pmf: Do not use readl() for policy buffer access

The policy buffer is allocated using normal memory allocation
functions, so readl() should not be used on it.

Use get_unaligned_le32() instead.

Compile-tested only.

Signed-off-by: Armin Wolf <W_Armin@....de>
---
 drivers/platform/x86/amd/pmf/tee-if.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/amd/pmf/tee-if.c b/drivers/platform/x86/amd/pmf/tee-if.c
index 16973bebf55f..3220b6580270 100644
--- a/drivers/platform/x86/amd/pmf/tee-if.c
+++ b/drivers/platform/x86/amd/pmf/tee-if.c
@@ -11,6 +11,7 @@
 #include <linux/debugfs.h>
 #include <linux/tee_drv.h>
 #include <linux/uuid.h>
+#include <asm/unaligned.h>
 #include "pmf.h"

 #define MAX_TEE_PARAM	4
@@ -249,8 +250,8 @@ static int amd_pmf_start_policy_engine(struct amd_pmf_dev *dev)
 	u32 cookie, length;
 	int res;

-	cookie = readl(dev->policy_buf + POLICY_COOKIE_OFFSET);
-	length = readl(dev->policy_buf + POLICY_COOKIE_LEN);
+	cookie = get_unaligned_le32(dev->policy_buf + POLICY_COOKIE_OFFSET);
+	length = get_unaligned_le32(dev->policy_buf + POLICY_COOKIE_LEN);

 	if (cookie != POLICY_SIGN_COOKIE || !length)
 		return -EINVAL;
--
2.39.2