From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: ebiederm@xmission.com (Eric W. Biederman)
Cc: Johan Hovold <jhovold@gmail.com>,
Greg Kroah-Hartman <gregkh@suse.de>,
Michael Trimarchi <trimarchi@gandalf.sssup.it>,
Oliver Neukum <oliver@neukum.org>,
linux-usb@vger.kernel.org, Alan Cox <alan@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] USB: ftdi_sio: Remove tty->low_latency.
Date: Sat, 3 Oct 2009 14:09:02 +0100 [thread overview]
Message-ID: <20091003140902.38628d8a@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <m1ske1wgdi.fsf@fess.ebiederm.org>
On Fri, 02 Oct 2009 16:00:41 -0700
ebiederm@xmission.com (Eric W. Biederman) wrote:
>
>
> I have seen a hang in:
> /bin/stty (changing the baud rate)
> set_termios
> tty_wait_until_sent
> tty_chars_in_buffer
> ftdi_chars_in_buffer
>
> Where the driver wedged for a serial port and no progress
> was made.
>
> This happened to me several times with 2.6.31. My initial
> hypothesis was this was a hardware error (as it only happened
> on single piece of hardware). With all of the driver problems
> I suspect it could be a driver bug.
Driver bug I would think - or setup. If you've genuinely got the port
flow controlled then a request to set the termios after the I/O will wait
until a signal or carrier change (or indeed forever) quite correctly.
next prev parent reply other threads:[~2009-10-03 13:07 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-24 15:40 Johan Hovold
2009-09-24 19:03 ` Oliver Neukum
2009-09-24 19:21 ` Alan Cox
2009-09-24 21:15 ` Johan Hovold
2009-09-25 17:46 ` Michael Trimarchi
2009-09-29 14:55 ` Johan Hovold
2009-09-29 22:52 ` Alan Cox
2009-09-30 6:33 ` Michael Trimarchi
2009-09-30 9:05 ` Johan Hovold
2009-10-02 2:52 ` Eric W. Biederman
2009-10-02 8:47 ` Johan Hovold
2009-10-02 16:33 ` Alan Cox
2009-10-02 22:29 ` Eric W. Biederman
2009-10-03 10:21 ` Johan Hovold
2009-10-02 23:00 ` Eric W. Biederman
2009-10-03 13:09 ` Alan Cox [this message]
2009-10-03 23:51 ` Eric W. Biederman
2009-11-17 18:35 ` Eric W. Biederman
2009-11-17 18:41 ` Oliver Neukum
2009-11-17 18:56 ` Eric W. Biederman
2009-11-17 20:05 ` Eric W. Biederman
2009-11-18 1:08 ` Eric W. Biederman
2009-11-18 3:10 ` [PATCH] ftdi_sio: Keep going when write errors are encountered Eric W. Biederman
2009-11-18 3:44 ` Greg KH
2009-10-03 11:42 ` [PATCH] USB: ftdi_sio: Remove tty->low_latency Johan Hovold
2009-10-03 12:11 ` Oliver Neukum
2009-10-03 12:28 ` Johan Hovold
2009-10-03 13:31 ` Oliver Neukum
2009-10-03 14:41 ` Johan Hovold
2009-10-03 13:18 ` Alan Cox
2009-10-03 13:27 ` Oliver Neukum
2009-10-03 14:05 ` Johan Hovold
2009-10-03 16:33 ` Alan Cox
2009-10-03 16:46 ` Johan Hovold
2009-10-04 19:48 ` Johan Hovold
2009-10-04 23:39 ` Eric W. Biederman
2009-10-05 7:01 ` Johan Hovold
2009-10-02 16:59 ` Greg KH
2009-10-02 9:04 ` Alan Cox
2009-10-02 9:53 ` Alan Cox
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