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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Stanislav Fomichev , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] net: net_failover: Fix the deadlock in net_failover_slave_name_change() Date: Tue, 8 Sep 2026 12:06:29 +0800 Message-ID: <20260908040708.3972058-1-faicker.mo@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Faicker Mo This is a sibling fix of commit b84c5632c7b3 ("net: net_failover: Fix the deadlock in slave register"). There is netdev_lock_ops() in the upper callers, so using netif_open() instead of dev_open(). Call Trace: __schedule+0x2bb/0x650 schedule+0x27/0xb0 schedule_preempt_disabled+0x15/0x30 __mutex_lock.constprop.0+0x550/0xaf0 __mutex_lock_slowpath+0x13/0x20 mutex_lock+0x3b/0x50 dev_open+0x3b/0xe0 net_failover_slave_name_change+0x22/0x40 failover_event+0xd4/0x1e0 notifier_call_chain+0x62/0xf0 raw_notifier_call_chain+0x16/0x30 call_netdevice_notifiers_info+0x50/0x80 netif_change_name+0x200/0x330 do_setlink.isra.0+0xb12/0xdf0 ? security_capable+0x9a/0x1e0 ? ns_capable+0x31/0x60 rtnl_setlink+0x302/0x670 ? netlink_recvmsg+0x296/0x340 ? security_capable+0x9a/0x1e0 ? __pfx_rtnl_setlink+0x10/0x10 rtnetlink_rcv_msg+0x384/0x460 ? __pfx_rtnetlink_rcv_msg+0x10/0x10 netlink_rcv_skb+0x61/0x120 rtnetlink_rcv+0x15/0x30 netlink_unicast+0x28f/0x3c0 netlink_sendmsg+0x216/0x450 __sys_sendto+0x222/0x230 __x64_sys_sendto+0x24/0x40 x64_sys_call+0x1d5d/0x2390 do_syscall_64+0x105/0x5a0 ? do_syscall_64+0x140/0x5a0 ? exc_page_fault+0x94/0x1e0 entry_SYSCALL_64_after_hwframe+0x76/0x7e Fixes: 7e4d784f5810 ("net: hold netdev instance lock during rtnetlink operations") Signed-off-by: Faicker Mo --- drivers/net/net_failover.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/net_failover.c b/drivers/net/net_failover.c index 3f7d31033bae..1b5213e87070 100644 --- a/drivers/net/net_failover.c +++ b/drivers/net/net_failover.c @@ -675,7 +675,7 @@ static int net_failover_slave_name_change(struct net_device *slave_dev, /* We need to bring up the slave after the rename by udev in case * open failed with EBUSY when it was registered. */ - dev_open(slave_dev, NULL); + netif_open(slave_dev, NULL); return 0; } -- 2.53.0