From: Daniel Borkmann <daniel@iogearbox.net>
To: Jakub Kicinski <kuba@kernel.org>, davem@davemloft.net
Cc: netdev@vger.kernel.org, edumazet@google.com, pabeni@redhat.com,
andrew+netdev@lunn.ch, horms@kernel.org, dw@davidwei.uk,
razor@blackwall.org, sdf@fomichev.me, dtatulea@nvidia.com,
bobbyeshleman@meta.com
Subject: Re: [PATCH net-next 4/4] netdev: don't use dev->flags for IFF_UP
Date: Tue, 9 Jun 2026 21:49:01 +0200 [thread overview]
Message-ID: <96cc2480-c675-4ab8-80f5-eac90dc4e95f@iogearbox.net> (raw)
In-Reply-To: <20260609190804.1137085-5-kuba@kernel.org>
On 6/9/26 9:08 PM, Jakub Kicinski wrote:
> dev->flags are not technically ops lock protected. The IFF_UP flag
> will not change when dev->lock is held, but other flags may change
> so KCSAN would probably not be impressed. Because of this we added
> a dedicated dev->up which is safe to read under dev->lock.
>
> qstats want to make sure device is up, use dev->up.
>
> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
next prev parent reply other threads:[~2026-06-09 19:49 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-09 19:08 [PATCH net-next 0/4] netdev: address a handful of nit picks Jakub Kicinski
2026-06-09 19:08 ` [PATCH net-next 1/4] netdev: check for nla_put_u32() failures Jakub Kicinski
2026-06-09 19:24 ` Bobby Eshleman
2026-06-09 19:52 ` Daniel Borkmann
2026-06-09 22:05 ` Jakub Kicinski
2026-06-09 19:56 ` Joe Damato
2026-06-09 19:08 ` [PATCH net-next 2/4] netdev: correct error code in netdev_nl_queue_fill_lease() Jakub Kicinski
2026-06-09 19:16 ` Bobby Eshleman
2026-06-09 19:48 ` Daniel Borkmann
2026-06-09 19:57 ` Joe Damato
2026-06-09 19:08 ` [PATCH net-next 3/4] netdev: avoid skipping objects on race with device disappearance Jakub Kicinski
2026-06-09 19:48 ` Daniel Borkmann
2026-06-09 19:59 ` Bobby Eshleman
2026-06-09 20:15 ` Bobby Eshleman
2026-06-09 21:19 ` Jakub Kicinski
2026-06-09 22:04 ` Bobby Eshleman
2026-06-09 19:08 ` [PATCH net-next 4/4] netdev: don't use dev->flags for IFF_UP Jakub Kicinski
2026-06-09 19:49 ` Daniel Borkmann [this message]
2026-06-09 19:54 ` Joe Damato
2026-06-09 20:00 ` Bobby Eshleman
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