linux-kernel - [PATCH] EDAC/amd64: Fix possible module load failure on some UMC usage combinations

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Message-ID: <20241209215636.2744733-1-avadhut.naik@amd.com>
Date: Mon, 9 Dec 2024 21:55:10 +0000
From: Avadhut Naik <avadhut.naik@....com>
To: <linux-edac@...r.kernel.org>
CC: <linux-kernel@...r.kernel.org>, <bp@...en8.de>, <yazen.ghannam@....com>,
	<avadhut.naik@....com>
Subject: [PATCH] EDAC/amd64: Fix possible module load failure on some UMC usage combinations

Starting Zen4, AMD SOCs have 12 Unified Memory Controllers (UMCs) per
socket.

When the amd64_edac module is being loaded, these UMCs are traversed to
determine if they have SdpInit (SdpCtrl[31]) and EccEnabled (UmcCapHi[30])
bits set and create masks in umc_en_mask and ecc_en_mask respectively.

However, the current data type of these variables is u8. As a result, if
only the last 4 UMCs (UMC8 - UMC11) of the system have been utilized,
umc_ecc_enabled() will return false. Consequently, the module may fail to
load on these systems.

Change the data type of these variables to u16.

Signed-off-by: Avadhut Naik <avadhut.naik@....com>
---
 drivers/edac/amd64_edac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index ddfbdb66b794..583685e8e60f 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -3362,7 +3362,7 @@ static bool dct_ecc_enabled(struct amd64_pvt *pvt)

 static bool umc_ecc_enabled(struct amd64_pvt *pvt)
 {
-	u8 umc_en_mask = 0, ecc_en_mask = 0;
+	u16 umc_en_mask = 0, ecc_en_mask = 0;
 	u16 nid = pvt->mc_node_id;
 	struct amd64_umc *umc;
 	u8 ecc_en = 0, i;
-- 
2.43.0