From 78723fe309f189ee4010d5b7a55f6a14644a40c2 Mon Sep 17 00:00:00 2001
From: Gerd Bayer <gbayer@linux.ibm.com>
Date: Fri, 24 Oct 2025 13:05:32 +0200
Subject: [PATCH] nvme-pci: add debug message on fail to read CSTS

Add a debug log spelling out that reading the CSTS register failed - to
distinguish this from other reasons for ENODEV.

Reviewed-by: Wilfred Mallawa <wilfred.mallawa@wdc.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Gerd Bayer <gbayer@linux.ibm.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
---
 drivers/nvme/host/pci.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 9a7616aa6889b..a9fc8ecdea485 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2977,6 +2977,7 @@ static int nvme_pci_enable(struct nvme_dev *dev)
 	pci_set_master(pdev);
 
 	if (readl(dev->bar + NVME_REG_CSTS) == -1) {
+		dev_dbg(dev->ctrl.device, "reading CSTS register failed\n");
 		result = -ENODEV;
 		goto disable;
 	}
-- 
2.47.3