linux-kernel - Re: [linux-usb-devel] ark3116: receive returns negative

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Message-ID: <20070517124525.GC20055@kroah.com>
Date:	Thu, 17 May 2007 05:45:25 -0700
From:	Greg KH <greg@...ah.com>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
Cc:	ark3116_driver@...tionant.de,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-serial@...r.kernel.org, linux-usb-devel@...ts.sourceforge.net
Subject: Re: [linux-usb-devel] ark3116: receive returns negative

On Wed, May 16, 2007 at 06:04:45PM +0200, Jan Engelhardt wrote:
> Hello,
> 
> 
> I seem to have problems with the ark3116 driver from 2.6.18.8. This is a 
> USB-RS232 cable. Just opening the /dev/ttyUSB0 device 
> gives (this is the 
> debug output enabled by `modprobe ark3116 debug=1`).
> 
> The lines that look suspicious are
> /serial/ark3116.c: 124 < 1 bytes [0xFFFFFFB0]
> and
> /serial/ark3116.c: ark3116_ioctl cmd 0x5401 not supported

Why is this suspicious?  We don't support all ioctls for all usb-serial
drivers, perhaps this one is just not really needed?

> I have also seen things like "id here < -62 [0x10]", which would 
> indicate that usb_control_msg() returned something very negative 
> (-ETIME!?).

But does the driver seem to work properly?

> Issuing a write() on an open fd to ttyUSB does not generate any further 
> debug output. Is the driver even complete/functional?

Do you get data through the device properly?

thanks,

greg k-h
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