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

[Krzysztof Kozlowski]

On 18/12/2025 02:23, Deepanshu Kartikey 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
> 


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxxxxx>

Best regards,
Krzysztof