The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.14.y git checkout FETCH_HEAD git cherry-pick -x 85520856466ed6bc3b1ccb013cddac70ceb437db # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023113039-aged-crook-4078@gregkh' --subject-prefix 'PATCH 4.14.y' HEAD^..

Possible dependencies:

85520856466e ("hv_netvsc: Fix race of register_netdevice_notifier and VF register") a7f99d0f2bbf ("hv_netvsc: use reciprocal divide to speed up percent calculation") 6b0cbe315868 ("hv_netvsc: Add initialization of tx_table in netvsc_device_add()")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 85520856466ed6bc3b1ccb013cddac70ceb437db Mon Sep 17 00:00:00 2001 From: Haiyang Zhang haiyangz@microsoft.com Date: Sun, 19 Nov 2023 08:23:42 -0800 Subject: [PATCH] hv_netvsc: Fix race of register_netdevice_notifier and VF register

If VF NIC is registered earlier, NETDEV_REGISTER event is replayed, but NETDEV_POST_INIT is not.

Move register_netdevice_notifier() earlier, so the call back function is set before probing.

Cc: stable@vger.kernel.org Fixes: e04e7a7bbd4b ("hv_netvsc: Fix a deadlock by getting rtnl lock earlier in netvsc_probe()") Reported-by: Dexuan Cui decui@microsoft.com Signed-off-by: Haiyang Zhang haiyangz@microsoft.com Reviewed-by: Wojciech Drewek wojciech.drewek@intel.com Reviewed-by: Dexuan Cui decui@microsoft.com Signed-off-by: Paolo Abeni pabeni@redhat.com

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c index 5e528a76f5f5..b7dfd51f09e6 100644 --- a/drivers/net/hyperv/netvsc_drv.c +++ b/drivers/net/hyperv/netvsc_drv.c @@ -2793,12 +2793,17 @@ static int __init netvsc_drv_init(void) } netvsc_ring_bytes = ring_size * PAGE_SIZE;

+ register_netdevice_notifier(&netvsc_netdev_notifier); + ret = vmbus_driver_register(&netvsc_drv); if (ret) - return ret; + goto err_vmbus_reg;

- register_netdevice_notifier(&netvsc_netdev_notifier); return 0; + +err_vmbus_reg: + unregister_netdevice_notifier(&netvsc_netdev_notifier); + return ret; }

MODULE_LICENSE("GPL");