linux-kernel - tty->low_latency + irq context

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Date:	Tue, 26 Dec 2006 01:08:41 +0059
From:	Jiri Slaby <jirislaby@...il.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
CC:	p.hardwick@...ion.com, hollisb@...ibm.com
Subject: tty->low_latency + irq context

Hi!

 *      tty_flip_buffer_push    -       terminal
 *      @tty: tty to push
 *
 *      Queue a push of the terminal flip buffers to the line discipline. This
 *      function must not be called from IRQ context if tty->low_latency is set.

But some drivers (mxser, nozomi, hvsi...) sets low_latency to 1 in _open and
calls tty_flip_buffer_push in isr or in functions, which are called from isr.
Is the comment correct or the drivers?

Moreover, hvsi says:
tty->low_latency = 1; /* avoid throttle/tty_flip_buffer_push race */

thanks,
-- 
http://www.fi.muni.cz/~xslaby/            Jiri Slaby
faculty of informatics, masaryk university, brno, cz
e-mail: jirislaby gmail com, gpg pubkey fingerprint:
B674 9967 0407 CE62 ACC8  22A0 32CC 55C3 39D4 7A7E
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