[PATCH 0/2] scsi: target+fcoe: replace -EEXIST with -EBUSY in module_init() paths

[Daniel Gomez]

The error code -EEXIST is reserved by the kernel module loader to
indicate that a module with the same name is already loaded. When a
module's init function returns -EEXIST, kmod interprets this as "module
already loaded" and reports success instead of failure [1].

The kernel module loader will include a safety net that provides -EEXIST
to -EBUSY with a warning [2], and a documentation patch has been sent to
prevent future occurrences [3].

These affected code paths were identified using a static analysis tool
[4] that traces -EEXIST returns to module_init(). The tool was developed
with AI assistance and all findings were manually validated.

Link: https://lore.kernel.org/all/aKEVQhJpRdiZSliu@xxxxxxxxxxxxx/ [1]
Link: https://lore.kernel.org/all/20251013-module-warn-ret-v1-0-ab65b41af01f@xxxxxxxxx/ [2]
Link: https://lore.kernel.org/all/20251218-dev-module-init-eexists-modules-docs-v1-0-361569aa782a@xxxxxxxxxxx/ [3]
Link: https://gitlab.com/-/snippets/4913469 [4]

Signed-off-by: Daniel Gomez <da.gomez@xxxxxxxxxxx>
---
Daniel Gomez (2):
      target: replace -EEXIST with -EBUSY
      scsi: fcoe: replace -EEXIST with -EBUSY

 drivers/scsi/fcoe/fcoe_transport.c | 2 +-
 drivers/target/target_core_hba.c   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20251218-dev-module-init-eexists-linux-scsi-4e91a16f7bdd

Best regards,
--  
Daniel Gomez <da.gomez@xxxxxxxxxxx>