Re: [PATCH net-next v1 2/4] net: protect net_devmem_dmabuf_bindings by new net_devmem_bindings_mutex

Jakub Kicinski
2025-03-07T17:50:00Z

On Fri, 7 Mar 2025 07:57:23 -0800 Stanislav Fomichev wrote:
> In the process of making queue management API rtnl_lock-less, we
> need a separate lock to protect xa that keeps a global list of bindings.
>
> Also change the ordering of 'posting' binding to
> net_devmem_dmabuf_bindings: xa_alloc is done after binding is fully
> initialized (so xa_load lookups fully instantiated bindings) and
> xa_erase is done as a first step during unbind.

You're just wrapping the calls to xarray here, is there a plan to use
this new lock for other things? xarray has a built in spin lock, we
don't have to protect it.