From: Paul Fulghum <paulkf@microgate.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: "Russell King" <rmk+lkml@arm.linux.org.uk>,
"Roland Caßebohm" <roland.cassebohm@VisionSystems.de>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: Re: Serial driver hangs
Date: Thu, 30 Sep 2004 16:25:04 -0500 [thread overview]
Message-ID: <1096579503.1938.166.camel@deimos.microgate.com> (raw)
In-Reply-To: <1096575030.19487.50.camel@localhost.localdomain>
On Thu, 2004-09-30 at 15:10, Alan Cox wrote:
> On Iau, 2004-09-30 at 21:30, Paul Fulghum wrote:
> > tty->flip.work.func and tty->flip.tqueue.routine
> > are set to flush_to_ldisc()
>
> flush_to_ldisc was ok, then someone added the low latency
> flag. In the current 2.6.9rc3 patch flush_to_ldisc honours
> TTY_DONT_FLIP also
In the cases I described the low latency flag
does not come into play because flush_to_ldisc()
is called directly instead of
through tty_flip_buffer_push().
TTY_DONT_FLIP is only set in read_chan().
If read_chan() is not running, TTY_DONT_FLIP is not
set and does not prevent buffers from flipping
if the ISR calls flush_to_ldisc() directly
while ldisc->receive_buf() is running.
The answer seems to be: don't call
flush_to_ldisc directly like the current
serial driver does.
--
Paul Fulghum
paulkf@microgate.com
next prev parent reply other threads:[~2004-09-30 21:25 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-28 15:34 Serial driver hangs Roland Caßebohm
2004-09-28 21:10 ` Paul Fulghum
2004-09-28 21:16 ` Russell King
2004-09-28 23:03 ` Paul Fulghum
2004-09-28 22:12 ` Alan Cox
2004-09-29 1:12 ` Paul Fulghum
2004-09-29 13:09 ` Roland Caßebohm
2004-09-29 13:17 ` Paul Fulghum
2004-09-29 14:07 ` Roland Caßebohm
2004-09-29 14:25 ` Paul Fulghum
2004-09-30 16:16 ` Roland Caßebohm
2004-09-30 19:09 ` Paul Fulghum
2004-09-30 18:34 ` Alan Cox
2004-09-30 19:51 ` Paul Fulghum
2004-09-30 19:59 ` Russell King
2004-09-30 20:05 ` Paul Fulghum
2004-09-30 20:30 ` Paul Fulghum
2004-09-30 20:10 ` Alan Cox
2004-09-30 21:25 ` Paul Fulghum [this message]
2004-10-01 0:47 ` Paul Fulghum
2004-10-01 15:22 ` Roland Caßebohm
2004-10-01 16:06 ` Paul Fulghum
2004-10-01 20:13 ` Stuart MacDonald
2004-10-01 20:36 ` Paul Fulghum
2004-09-29 14:13 ` Paul Fulghum
2004-10-01 15:25 ` Roland Caßebohm
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