From: Vinicius Costa Gomes <vinicius.gomes@intel.com>
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, jakub@cloudflare.com,
maxime.chevallier@bootlin.com, nb@tipi-net.de, lee@kernel.org,
linux-leds@vger.kernel.org, pavel@kernel.org, jv@jvosburgh.net,
michael.chan@broadcom.com, jhs@mojatatu.com, idosch@nvidia.com,
razor@blackwall.org, hare@suse.de, jhasan@marvell.com,
danieller@nvidia.com, Jakub Kicinski <kuba@kernel.org>
Subject: Re: [PATCH net-next v2 08/11] net: sched: don't recurse on the netdev ops lock in qdiscs
Date: Thu, 04 Jun 2026 16:38:16 -0700 [thread overview]
Message-ID: <87ldctq3kn.fsf@intel.com> (raw)
In-Reply-To: <20260603012840.2254293-9-kuba@kernel.org>
Jakub Kicinski <kuba@kernel.org> writes:
> cbs_set_port_rate() and taprio_set_picos_per_byte() are reached from
> two paths and both already hold the device's ops lock:
>
> *_change(), via tc_modify_qdisc() which calls netdev_lock_ops(dev)
> before dispatching to the qdisc ops.
>
> *_dev_notifier() on NETDEV_UP / NETDEV_CHANGE, where caller
> holds the ops lock across the notifier chain.
>
> Switch to netif_get_link_ksettings() to avoid deadlock once
> __ethtool_get_link_ksettings() starts taking the netdev lock.
>
> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
> ---
Acked-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Cheers,
--
Vinicius
next prev parent reply other threads:[~2026-06-04 23:38 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-03 1:28 [PATCH net-next v2 00/11] net: ethtool: make sure __ethtool_get_link_ksettings() is ops-locked Jakub Kicinski
2026-06-03 1:28 ` [PATCH net-next v2 01/11] net: rename netdev_ops_assert_locked() Jakub Kicinski
2026-06-03 7:29 ` Nicolai Buchwitz
2026-06-03 11:15 ` Jakub Sitnicki
2026-06-03 17:05 ` Stanislav Fomichev
2026-06-03 1:28 ` [PATCH net-next v2 02/11] net: ethtool: cmis_cdb: hold instance lock for ops locked devices Jakub Kicinski
2026-06-03 17:06 ` Stanislav Fomichev
2026-06-03 1:28 ` [PATCH net-next v2 03/11] net: document NETDEV_CHANGENAME as ops locked Jakub Kicinski
2026-06-03 12:47 ` Jakub Sitnicki
2026-06-03 17:06 ` Stanislav Fomichev
2026-06-03 1:28 ` [PATCH net-next v2 04/11] net: ethtool: add netif_get_link_ksettings() for correct ops-locked use Jakub Kicinski
2026-06-03 6:40 ` Maxime Chevallier
2026-06-03 17:06 ` Stanislav Fomichev
2026-06-03 1:28 ` [PATCH net-next v2 05/11] net: bonding: don't recurse on the slave's netdev ops lock Jakub Kicinski
2026-06-03 7:20 ` Nicolai Buchwitz
2026-06-03 1:28 ` [PATCH net-next v2 06/11] net: team: don't recurse on the port's " Jakub Kicinski
2026-06-03 1:28 ` [PATCH net-next v2 07/11] net: bridge: " Jakub Kicinski
2026-06-03 7:16 ` Nicolai Buchwitz
2026-06-03 7:54 ` Nikolay Aleksandrov
2026-06-03 13:28 ` Ido Schimmel
2026-06-03 1:28 ` [PATCH net-next v2 08/11] net: sched: don't recurse on the netdev ops lock in qdiscs Jakub Kicinski
2026-06-04 23:38 ` Vinicius Costa Gomes [this message]
2026-06-03 1:28 ` [PATCH net-next v2 09/11] leds: trigger: netdev: don't recurse on the netdev ops lock Jakub Kicinski
2026-06-03 1:28 ` [PATCH net-next v2 10/11] scsi: fcoe: don't recurse on the netdev's " Jakub Kicinski
2026-06-03 1:28 ` [PATCH net-next v2 11/11] net: ethtool: make sure __ethtool_get_link_ksettings() is ops-locked Jakub Kicinski
2026-06-03 7:18 ` Nicolai Buchwitz
2026-06-03 17:06 ` Stanislav Fomichev
2026-06-04 21:30 ` [PATCH net-next v2 00/11] " patchwork-bot+netdevbpf
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