linux-kernel - Re: [PATCH] Add support for Mobilcom Debitel USB UMTS Surf-Stick to option driver

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Date:	Sun, 22 Nov 2009 09:20:16 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Gernot Hillier <gernot@...lier.de>
Cc:	Matthias Urlichs <smurf@...rf.noris.de>,
	"Greg Kroah-Hartman" <gregkh@...e.de>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Add support for Mobilcom Debitel USB UMTS Surf-Stick to option driver

Am Sonntag, 22. November 2009 09:08:44 schrieb Gernot Hillier:
> In addition, this device seems to ignore setting of RTS/DTR by option_send_
> setup and doesn't answer the usb_control_msg leading to a 5 s timeout
> (USB_CTRL_SET_TIMEOUT) in userspace open() and other operations. As this
> confused several impatient userspace applications like Minicom and
>  ModemManager, I decided to reduce the timeout to more reasonable 1000 ms.
>  I don't think the usual USB GSM stick needs longer, so this should be
>  safe.

Unfortunately the 5s timeout comes from the USB spec for control
messages. So reducing it is a serious matter. In this case I'd prefer
if you introduce a special case for these devices and fail the operation
without doing any IO.

	Regards
		Oliver
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