io_uring/zcrx: call netdev_queue_get_dma_dev() under instance lock

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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.

Fixes: 59b8b32ac8 ("io_uring/zcrx: add support for custom DMA devices")
Signed-off-by: David Wei <dw@davidwei.uk>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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David Wei 2025-10-31 19:24:49 -07:00 • committed by Jens Axboe

parent c07a491c1b

commit b6c5f9454e

1 changed files with 10 additions and 6 deletions

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io_uring/zcrx.c

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