FAILED: patch "[PATCH] net: txgbe: fix RTNL assertion warning when remove module" failed to apply to 6.6-stable tree

gregkh
2026-05-01T12:05:16Z

The patch below does not apply to the 6.6-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-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x e159f05e12cc1111a3103b99375ddf0dfd0e7d63
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026050105-ascent-escalate-2044@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

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

From e159f05e12cc1111a3103b99375ddf0dfd0e7d63 Mon Sep 17 00:00:00 2001
From: Jiawen Wu <jiawenwu@trustnetic.com>
Date: Tue, 7 Apr 2026 17:40:41 +0800
Subject: [PATCH] net: txgbe: fix RTNL assertion warning when remove module

For the copper NIC with external PHY, the driver called
phylink_connect_phy() during probe and phylink_disconnect_phy() during
remove. It caused an RTNL assertion warning in phylink_disconnect_phy()
upon module remove.

To fix this, add rtnl_lock() and rtnl_unlock() around the
phylink_disconnect_phy() in remove function.

------------[ cut here ]------------
RTNL: assertion failed at drivers/net/phy/phylink.c (2351)
WARNING: drivers/net/phy/phylink.c:2351 at
phylink_disconnect_phy+0xd8/0xf0 [phylink], CPU#0: rmmod/4464
Modules linked in: ...
CPU: 0 UID: 0 PID: 4464 Comm: rmmod Kdump: loaded Not tainted 7.0.0-rc4+
Hardware name: Micro-Star International Co., Ltd. MS-7E16/X670E GAMING
PLUS WIFI (MS-7E16), BIOS 1.90 12/31/2024
RIP: 0010:phylink_disconnect_phy+0xe4/0xf0 [phylink]
Code: 5b 41 5c 41 5d 41 5e 41 5f 5d 31 c0 31 d2 31 f6 31 ff e9 3a 38 8f e7
48 8d 3d 48 87 e2 ff ba 2f 09 00 00 48 c7 c6 c1 22 24 c0 <67> 48 0f b9 3a
e9 34 ff ff ff 66 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffce7288363ac0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff89654b2a1a00 RCX: 0000000000000000
RDX: 000000000000092f RSI: ffffffffc02422c1 RDI: ffffffffc0239020
RBP: ffffce7288363ae8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8964c4022000
R13: ffff89654fce3028 R14: ffff89654ebb4000 R15: ffffffffc0226348
FS: 0000795e80d93780(0000) GS:ffff896c52857000(0000)
knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005b528b592000 CR3: 0000000170d0f000 CR4: 0000000000f50ef0
PKRU: 55555554
Call Trace:
<TASK>
txgbe_remove_phy+0xbb/0xd0 [txgbe]
txgbe_remove+0x4c/0xb0 [txgbe]
pci_device_remove+0x41/0xb0
device_remove+0x43/0x80
device_release_driver_internal+0x206/0x270
driver_detach+0x4a/0xa0
bus_remove_driver+0x83/0x120
driver_unregister+0x2f/0x60
pci_unregister_driver+0x40/0x90
txgbe_driver_exit+0x10/0x850 [txgbe]
__do_sys_delete_module.isra.0+0x1c3/0x2f0
__x64_sys_delete_module+0x12/0x20
x64_sys_call+0x20c3/0x2390
do_syscall_64+0x11c/0x1500
? srso_alias_return_thunk+0x5/0xfbef5
? do_syscall_64+0x15a/0x1500
? srso_alias_return_thunk+0x5/0xfbef5
? do_fault+0x312/0x580
? srso_alias_return_thunk+0x5/0xfbef5
? __handle_mm_fault+0x9d5/0x1040
? srso_alias_return_thunk+0x5/0xfbef5
? count_memcg_events+0x101/0x1d0
? srso_alias_return_thunk+0x5/0xfbef5
? handle_mm_fault+0x1e8/0x2f0
? srso_alias_return_thunk+0x5/0xfbef5
? do_user_addr_fault+0x2f8/0x820
? srso_alias_return_thunk+0x5/0xfbef5
? irqentry_exit+0xb2/0x600
? srso_alias_return_thunk+0x5/0xfbef5
? exc_page_fault+0x92/0x1c0
entry_SYSCALL_64_after_hwframe+0x76/0x7e

Fixes: 02b2a6f91b90 ("net: txgbe: support copper NIC with external PHY")
Cc: stable@vger.kernel.org
Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/8B47A5872884147D+20260407094041.4646-1-jiawenwu@trustnetic.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c b/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c
index 8ea7aa07ae4e..dc9f24314658 100644
--- a/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c
+++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_phy.c
@@ -657,7 +657,9 @@ void txgbe_remove_phy(struct txgbe *txgbe)
return;
case wx_mac_sp:
if (txgbe->wx->media_type == wx_media_copper) {
+ rtnl_lock();
phylink_disconnect_phy(txgbe->wx->phylink);
+ rtnl_unlock();
phylink_destroy(txgbe->wx->phylink);
return;
}