linux-kernel - [PATCH 2/2] nvme-pci: Add debug message on fail to read CSTS

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Message-Id: <20251020-nvme_probefail-v1-2-a420046d98f0@linux.ibm.com>
Date: Mon, 20 Oct 2025 17:29:08 +0200
From: Gerd Bayer <gbayer@...ux.ibm.com>
To: Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...nel.dk>,
        Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>
Cc: Niklas Schnelle <schnelle@...ux.ibm.com>, linux-nvme@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Gerd Bayer <gbayer@...ux.ibm.com>
Subject: [PATCH 2/2] 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.

Signed-off-by: Gerd Bayer <gbayer@...ux.ibm.com>
---
 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 7544c4bac2c4a230d32cf729abb9e94bf93a921f..c3b0a9d56ac1f32f67ce0890becd6425eb80ebad 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2906,6 +2906,7 @@ 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, "Read CSTS register failed");
 		result = -ENODEV;
 		goto disable;
 	}

-- 
2.48.1