Re: [PATCH net] netdevsim: check the driver is bound in new_port/del_port

[patchwork-bot+netdevbpf]

Hello:

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

On Sun,  1 Nov 2026 20:58:24 +0700 you wrote:
> new_port and del_port are attributes of the bus device, so they stay
> reachable after the driver is unbound. nsim_drv_remove() clears
> drvdata, yet both handlers pass it straight to priv_to_devlink() and
> devl_lock(), which faults on a small negative pointer:
> 
>   BUG: unable to handle page fault for address: fffffffffffffeb0
>   RIP: 0010:__lock_acquire+0x41/0x2de0 kernel/locking/lockdep.c:5140
>   Call Trace:
>    lock_acquire+0x115/0x350
>    mutex_lock_nested+0x55/0x1d0
>    nsim_drv_port_add+0x5a/0x140 drivers/net/netdevsim/dev.c:1760
>    new_port_store+0x1a5/0x280 drivers/net/netdevsim/bus.c:96
>    kernfs_fop_write_iter+0x3a5/0x540
> 
> [...]

Here is the summary with links:
  - [net] netdevsim: check the driver is bound in new_port/del_port
    https://git.kernel.org/netdev/net-next/c/98aaf4da98d2

You are awesome, thank you!
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