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Date: Sat, 14 Mar 2009 21:42:30 +0000
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Jan Kasprzak <kas@fi.muni.cz>
Cc: jirislaby@gmail.com, linux-kernel@vger.kernel.org
Subject: Re: MOXA I/O errors on 2.6.28+
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On Sat, 14 Mar 2009 22:36:30 +0100
Jan Kasprzak <kas@fi.muni.cz> wrote:

> 	Hello,
> 
> I have several servers with MOXA C320 serial boards. Starting with 2.6.28,
> some ports on MOXA boards sometimes get to a state where open("/dev/ttyMX<n>")
> returns -EIO. I use the servers with MOXA boards as serial console hubs,
> and I think the EIO state is caused by the remote getty or the whole remote
> server being restarted.

Sounds like a refcount bug.

> 	2.6.27 is OK, 2.6.28 and 2.6.29-rc8 is faulty. I can git bisect
> if you want (I have a spare server which I can reboot at will).

Might be useful but let me take a look first, chances are you've provided
enough information
> 
> 	My MOXA boards are
> 
> 01:08.0 Serial controller: Moxa Technologies Co Ltd Intellio C320 Turbo PCI (rev 02)
> 
> 	What can I do to have this problem fixed? Thanks,

Step 1: Report it giving accurate detailed info... which you've done
nicely.

Alan
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