linux-kernel - [PATCH v2 1/2] platform/x86/amd/pmf: Do not use readl() for policy buffer access

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Date: Tue, 27 Feb 2024 15:54:59 +0100
From: Armin Wolf <W_Armin@....de>
To: Shyam-sundar.S-k@....com
Cc: hdegoede@...hat.com,
	ilpo.jarvinen@...ux.intel.com,
	platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] 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.

Compile-tested only.

Signed-off-by: Armin Wolf <W_Armin@....de>
---
Changes since v1:
- get the full dword instead of only 8 bits
---
 drivers/platform/x86/amd/pmf/tee-if.c | 4 ++--
 1 file changed, 2 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..b3491268b6a0 100644
--- a/drivers/platform/x86/amd/pmf/tee-if.c
+++ b/drivers/platform/x86/amd/pmf/tee-if.c
@@ -249,8 +249,8 @@ 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 = *(u32 *)(dev->policy_buf + POLICY_COOKIE_OFFSET);
+	length = *(u32 *)(dev->policy_buf + POLICY_COOKIE_LEN);

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