From: Jakub Kicinski <kuba@kernel.org>
To: David Wei <dw@davidwei.uk>
Cc: io-uring@vger.kernel.org, netdev@vger.kernel.org,
Jens Axboe <axboe@kernel.dk>,
Pavel Begunkov <asml.silence@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Paolo Abeni <pabeni@redhat.com>, Simon Horman <horms@kernel.org>
Subject: Re: [PATCH net v1] net: io_uring/zcrx: call netdev_queue_get_dma_dev() under instance lock
Date: Tue, 28 Oct 2025 15:38:20 -0700 [thread overview]
Message-ID: <20251028153820.414b3956@kernel.org> (raw)
In-Reply-To: <20251028212639.2802158-1-dw@davidwei.uk>
On Tue, 28 Oct 2025 14:26:39 -0700 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.
>
> Opted to do this by hand instead of netdev_get_by_index_lock(), which is
> an older helper that doesn't take netdev tracker.
Fixes tag missing.
netdev_get_by_index_lock() + netdev_hold() would be a better choice indeed.
Just a reference doesn't hold off device shutdown.
Is there a chance to reorder the io_zcrx_create_area() call, keep
holding the lock and call __net_mp_open_rxq() ?
next prev parent reply other threads:[~2025-10-28 22:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-28 21:26 [PATCH net v1] net: io_uring/zcrx: call netdev_queue_get_dma_dev() under instance lock David Wei
2025-10-28 22:38 ` Jakub Kicinski [this message]
2025-10-28 22:44 ` David Wei
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