[PATCH net-next v3 0/3] net: core: improvements to device lookup by hardware address.

[Breno Leitao]

The first patch adds missing documentation for the return value of
dev_getbyhwaddr_rcu(), fixing a warning reported by NIPA. The kdoc
comment now properly specifies that the function returns either a
pointer to net_device or NULL when no matching device is found.

The second patch adds a new dev_getbyhwaddr() helper function for
finding devices by hardware address when the RTNL lock is held. This
prevents PROVE_LOCKING warnings that occurred when RTNL was held but the
RCU read lock wasn't. The common address comparison logic is extracted
into dev_comp_addr() to avoid code duplication.

The third part coverts arp_req_set_public() to the new helper.

Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx>
---
Changes in v3:
- Fixed the cover letter (Kuniyuki Iwashima)
- Added a third patch converting arp_req_set_public() to the new helper
  (Kuniyuki Iwashima)
- Link to v2:
  https://lore.kernel.org/r/20250210-arm_fix_selftest-v2-0-ba84b5bc58c8@xxxxxxxxxx

Changes in v2:
- Fixed the documentation (Jakub)
- Renamed the function from dev_getbyhwaddr_rtnl() to dev_getbyhwaddr()
  (Jakub)
- Exported the function in the header (Jakub)
- Link to v1: https://lore.kernel.org/r/20250207-arm_fix_selftest-v1-1-487518d2fd1c@xxxxxxxxxx

---
Breno Leitao (3):
      net: document return value of dev_getbyhwaddr_rcu()
      net: Add dev_getbyhwaddr_rtnl() helper
      arp: switch to dev_getbyhwaddr() in arp_req_set_public()

 include/linux/netdevice.h |  2 ++
 net/core/dev.c            | 38 ++++++++++++++++++++++++++++++++++----
 net/ipv4/arp.c            |  2 +-
 3 files changed, 37 insertions(+), 5 deletions(-)
---
base-commit: 4e41231249f4083a095085ff86e317e29313c2c3
change-id: 20250207-arm_fix_selftest-ee29dbc33a06

Best regards,
-- 
Breno Leitao <leitao@xxxxxxxxxx>