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

[Lorenzo Bianconi]

On Mar 26, Jakub Kicinski wrote:
> On Tue, 24 Mar 2026 17:54:45 +0100 Lorenzo Bianconi wrote:
> > 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
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