linux-kernel - Re: n_tty_write() going into schedule but NOT coming out

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Date:	Wed, 3 Apr 2013 13:12:28 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Ilya Zykov <linux@...k.ru>
CC:	lkml <linux-kernel@...r.kernel.org>,
	<linux-serial@...r.kernel.org>, "Ingo Molnar" <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Peter Hurley <peter@...leysoftware.com>
Subject: Re: n_tty_write() going into schedule but NOT coming out

Hi Ilya

On 04/03/2013 11:14 AM, Ilya Zykov wrote:
> Please, try this patch maybe it can help localize your problem.
>
>  drivers/tty/n_tty.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
> index 05e72be..28f15d0 100644
> --- a/drivers/tty/n_tty.c
> +++ b/drivers/tty/n_tty.c
> @@ -230,6 +230,7 @@ static void reset_buffer_flags(struct tty_struct *tty)
>  	ldata->canon_head = ldata->canon_data = ldata->erasing = 0;
>  	bitmap_zero(ldata->read_flags, N_TTY_BUF_SIZE);
>  	n_tty_set_room(tty);
> +	check_unthrottle(tty);
>  }
>  
>  /**

Thanks for the patch - but it didn't help at all - I see the same lockup.
I'm no tty expert so don't understand how this patch would help - care to elaborate ?

Thx,
-Vineet
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