linux-kernel - Re: |Question] iforce Boeder Force Feedback Wheel

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Date:   Mon, 4 Jul 2022 20:41:36 +0200
From:   Greg T <greg.iforce@...il.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: Re: |Question] iforce Boeder Force Feedback Wheel

2022-07-04 4:19 GMT+02:00, Greg T <greg.iforce@...il.com>:
> Call Trace:
>  <TASK>
>  _raw_spin_lock_irqsave+0x41/0x50
>  uart_write+0x69/0x1e0
>  serport_serio_write+0x2b/0x40 [serport]
>  iforce_serio_xmit+0xa8/0x1a0 [iforce_serio]
>  serport_ldisc_write_wakeup+0x59/0x70 [serport]

I've found this in tty_ldisc.h:

 * @write_wakeup: [DRV] ``void ()(struct tty_struct *tty)``
 *
 *	This function is called by the low-level tty driver to signal that line
 *	discpline should try to send more characters to the low-level driver
 *	for transmission. If the line discpline does not have any more data to
 *	send, it can just return. If the line discipline does have some data to
 *	send, please arise a tasklet or workqueue to do the real data transfer.
 *	Do not send data in this hook, it may lead to a deadlock.

Does iforce-serio.c have a maintainer? It looks to me that
iforce_serio_write_wakeup should not call iforce_serio_xmit in it.