Re: [PATCH v3 2/2] net: io_uring/zcrx: call netdev_queue_get_dma_dev() under instance lock

On 11/1/25 02:24, David Wei wrote:

netdev ops must be called under instance lock or rtnl_lock, but
io_register_zcrx_ifq() isn't doing this for netdev_queue_get_dma_dev().
Fix this by taking the instance lock using netdev_get_by_index_lock().

Extended the instance lock section to include attaching a memory
provider. Could not move io_zcrx_create_area() outside, since the dmabuf
codepath IORING_ZCRX_AREA_DMABUF requires ifq->dev.

It's probably fine for now, but this nested waiting feels
uncomfortable considering that it could be waiting for other
devices to finish IO via dmabuf fences.

-- 
Pavel Begunkov