Re: [PATCH net-next] net: airoha: Grab flow_offload_mutex running airoha_register_gdm_devices()

On Mar 26, Jakub Kicinski wrote:

On Tue, 24 Mar 2026 17:54:45 +0100 Lorenzo Bianconi wrote:

quoted

Netfilter flowtable can theoretically try offload flower rules as soon
as a net-device is registered while not all the other ones are
registered/initialized, triggering a possible NULL pointer dereferencing
of qdma pointer in airoha_ppe_set_cpu_port routine. In order to avoid any
possible race, grab the flow_offload_mutex running
airoha_register_gdm_devices().

Sashiko says this causes a lock ordering issue:
https://sashiko.dev/#/patchset/20260324-airoha-regiser-race-fix-v1-1-6014df55886b@kernel.org

Ack, right. Thx for pointing this issue out. I will work on a different
solution.

Regards,
Lorenzo