This is a note to let you know that I've just added the patch titled
hv_netvsc: Fix race of register_netdevice_notifier and VF register
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
hv_netvsc-fix-race-of-register_netdevice_notifier-and-vf-register.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 85520856466ed6bc3b1ccb013cddac70ceb437db Mon Sep 17 00:00:00 2001
From: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
Date: Sun, 19 Nov 2023 08:23:42 -0800
Subject: hv_netvsc: Fix race of register_netdevice_notifier and VF register
From: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
commit 85520856466ed6bc3b1ccb013cddac70ceb437db upstream.
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@xxxxxxxxxxxxxxx
Fixes: e04e7a7bbd4b ("hv_netvsc: Fix a deadlock by getting rtnl lock earlier in netvsc_probe()")
Reported-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
Signed-off-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
Reviewed-by: Wojciech Drewek <wojciech.drewek@xxxxxxxxx>
Reviewed-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/hyperv/netvsc_drv.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -2528,12 +2528,17 @@ 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");
Patches currently in stable-queue which might be from haiyangz@xxxxxxxxxxxxx are
queue-5.4/hv_netvsc-fix-race-of-register_netdevice_notifier-and-vf-register.patch
queue-5.4/hv_netvsc-mark-vf-as-slave-before-exposing-it-to-user-mode.patch
