[PATCH v3 0/2] nvme-pci: Log failures to probe

[Gerd Bayer]

Hi,

occasionally, an NVMe drive fails to reply to MMIO reads despite the PCI
link being operational. In these situations (obviously not on the
boot-device :) it is preferred to have this reported in the kernel log
instead of deducing that something is wrong by comparing expectated vs.
observed number of nvme devices.

 - 1/2 adds a clear indication that the device driver failed to probe an
   NVMe drive and will not register a nvme device.
 - 2/2 adds a debug log that allows to further zoom in on the exact
   failure

I've split this into two patches, since 2/2 might be less important wrt
to back-ports, etc.

Thanks,
Gerd

Signed-off-by: Gerd Bayer <gbayer at linux.ibm.com>
---
Changes in v3:
- Both patches: Added Christop Helwig's R-b's
- Patch 2/2: add newline (per John Garry)
- Link to v2: https://lore.kernel.org/r/20251022-nvme_probefail-v2-0-26bbdf94280e@linux.ibm.com

Changes in v2:
- Patch 1/2:
  - Replace dev_err() with dev_err_probe(), now last before return
  - Drop R-b from Wilfred Mallawa
- Patch 2/2: Reword as suggested by Christoph Hellwig, pick up R-b's
- Link to v1: https://lore.kernel.org/r/20251020-nvme_probefail-v1-0-a420046d98f0@linux.ibm.com

---
Gerd Bayer (2):
      nvme-pci: Print error message on failure in nvme_probe
      nvme-pci: Add debug message on fail to read CSTS

 drivers/nvme/host/pci.c | 2 ++
 1 file changed, 2 insertions(+)
---
base-commit: 211ddde0823f1442e4ad052a2f30f050145ccada
change-id: 20251015-nvme_probefail-3976120a4719

Best regards,
-- 
Gerd Bayer <gbayer at linux.ibm.com>