From: Paul Fulghum <paulkf@microgate.com>
To: Russell King <rmk+lkml@arm.linux.org.uk>
Cc: "Alan Cox" <alan@lxorguk.ukuu.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 15:30:01 -0500 [thread overview]
Message-ID: <1096576200.1938.154.camel@deimos.microgate.com> (raw)
In-Reply-To: <1096574739.1938.142.camel@deimos.microgate.com>
On Thu, 2004-09-30 at 15:05, Paul Fulghum wrote:
> My statement of 'most drivers' is wrong.
> I should have said 'some drivers'
> including 2.4 serial.c and the 8250/serial of 2.6
Specifically it is the use of this code fragment
in the ISR of serial.c (2.4) and the various
drivers in driver/serial of 2.6:
if (unlikely(tty->flip.count >= TTY_FLIPBUF_SIZE)) {
tty->flip.work.func((void *)tty);
if (tty->flip.count >= TTY_FLIPBUF_SIZE)
return; // if TTY_DONT_FLIP is set
}
in 2.4 it is
if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
tty->flip.tqueue.routine((void *) tty);
if (tty->flip.count >= TTY_FLIPBUF_SIZE)
return; // if TTY_DONT_FLIP is set
}
tty->flip.work.func and tty->flip.tqueue.routine
are set to flush_to_ldisc()
--
Paul Fulghum
paulkf@microgate.com
next prev parent reply other threads:[~2004-09-30 20:33 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 [this message]
2004-09-30 20:10 ` Alan Cox
2004-09-30 21:25 ` Paul Fulghum
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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