linux-kernel - [PATCH 1/1] PCI/DPC: Fix TLP Prefix register reading offset

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Message-Id: <20240118110815.3867-1-ilpo.jarvinen@linux.intel.com>
Date: Thu, 18 Jan 2024 13:08:15 +0200
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
	"Oliver O'Halloran" <oohall@...il.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Keith Busch <kbusch@...nel.org>,
	Dongdong Liu <liudongdong3@...wei.com>,
	linuxppc-dev@...ts.ozlabs.org,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH 1/1] PCI/DPC: Fix TLP Prefix register reading offset

The TLP Prefix Log Register consists of multiple DWORDs (PCIe r6.1 sec
7.9.14.13) but the loop in dpc_process_rp_pio_error() keeps reading
from the first DWORD. Add the iteration count based offset calculation
into the config read.

Fixes: f20c4ea49ec4 ("PCI/DPC: Add eDPC support")
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 drivers/pci/pcie/dpc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
index 94111e438241..e5d7c12854fa 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -234,7 +234,7 @@ static void dpc_process_rp_pio_error(struct pci_dev *pdev)
 
 	for (i = 0; i < pdev->dpc_rp_log_size - 5; i++) {
 		pci_read_config_dword(pdev,
-			cap + PCI_EXP_DPC_RP_PIO_TLPPREFIX_LOG, &prefix);
+			cap + PCI_EXP_DPC_RP_PIO_TLPPREFIX_LOG + i * 4, &prefix);
 		pci_err(pdev, "TLP Prefix Header: dw%d, %#010x\n", i, prefix);
 	}
  clear_status:
-- 
2.39.2