Re: [PATCH v2] net: nfc: fix deadlock between nfc_unregister_device and rfkill_fop_write

Hello:

This patch was applied to netdev/net.git (main) by Paolo Abeni pabeni@redhat.com:

On Thu, 18 Dec 2025 06:53:54 +0530 you wrote:

A deadlock can occur between nfc_unregister_device() and rfkill_fop_write() due to lock ordering inversion between device_lock and rfkill_global_mutex.

The problematic lock order is:

Thread A (rfkill_fop_write): rfkill_fop_write() mutex_lock(&rfkill_global_mutex) rfkill_set_block() nfc_rfkill_set_block() nfc_dev_down() device_lock(&dev->dev) <- waits for device_lock

[...]

Here is the summary with links: - [v2] net: nfc: fix deadlock between nfc_unregister_device and rfkill_fop_write https://git.kernel.org/netdev/net/c/1ab526d97a57

You are awesome, thank you!