Re: [PATCH net v3] phy: mscc: Stop taking ts_lock for tx_queue and use its own lock

[patchwork-bot+netdevbpf@kernel.org]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Tue, 2 Sep 2025 14:12:59 +0200 you wrote:
> When transmitting a PTP frame which is timestamp using 2 step, the
> following warning appears if CONFIG_PROVE_LOCKING is enabled:
> =============================
> [ BUG: Invalid wait context ]
> 6.17.0-rc1-00326-ge6160462704e #427 Not tainted
> -----------------------------
> ptp4l/119 is trying to lock:
> c2a44ed4 (&vsc8531->ts_lock){+.+.}-{3:3}, at: vsc85xx_txtstamp+0x50/0xac
> other info that might help us debug this:
> context-{4:4}
> 4 locks held by ptp4l/119:
>  #0: c145f068 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x58/0x1440
>  #1: c29df974 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: __dev_queue_xmit+0x5c4/0x1440
>  #2: c2aaaad0 (_xmit_ETHER#2){+.-.}-{2:2}, at: sch_direct_xmit+0x108/0x350
>  #3: c2aac170 (&lan966x->tx_lock){+.-.}-{2:2}, at: lan966x_port_xmit+0xd0/0x350
> stack backtrace:
> CPU: 0 UID: 0 PID: 119 Comm: ptp4l Not tainted 6.17.0-rc1-00326-ge6160462704e #427 NONE
> Hardware name: Generic DT based system
> Call trace:
>  unwind_backtrace from show_stack+0x10/0x14
>  show_stack from dump_stack_lvl+0x7c/0xac
>  dump_stack_lvl from __lock_acquire+0x8e8/0x29dc
>  __lock_acquire from lock_acquire+0x108/0x38c
>  lock_acquire from __mutex_lock+0xb0/0xe78
>  __mutex_lock from mutex_lock_nested+0x1c/0x24
>  mutex_lock_nested from vsc85xx_txtstamp+0x50/0xac
>  vsc85xx_txtstamp from lan966x_fdma_xmit+0xd8/0x3a8
>  lan966x_fdma_xmit from lan966x_port_xmit+0x1bc/0x350
>  lan966x_port_xmit from dev_hard_start_xmit+0xc8/0x2c0
>  dev_hard_start_xmit from sch_direct_xmit+0x8c/0x350
>  sch_direct_xmit from __dev_queue_xmit+0x680/0x1440
>  __dev_queue_xmit from packet_sendmsg+0xfa4/0x1568
>  packet_sendmsg from __sys_sendto+0x110/0x19c
>  __sys_sendto from sys_send+0x18/0x20
>  sys_send from ret_fast_syscall+0x0/0x1c
> Exception stack(0xf0b05fa8 to 0xf0b05ff0)
> 5fa0:                   00000001 0000000e 0000000e 0004b47a 0000003a 00000000
> 5fc0: 00000001 0000000e 00000000 00000121 0004af58 00044874 00000000 00000000
> 5fe0: 00000001 bee9d420 00025a10 b6e75c7c
> 
> [...]

Here is the summary with links:
  - [net,v3] phy: mscc: Stop taking ts_lock for tx_queue and use its own lock
    https://git.kernel.org/netdev/net/c/9b2bfdbf43ad

You are awesome, thank you!
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