On Wed, Feb 20, 2008 at 10:35:48AM -0800, Chetan Karia wrote: > Hello, > > I am kernel newbie and I have a question about usb serial driver. I > have a usb to serial driver which exposes 3 virtual serial ports > ttyUSB0, ttyUSB1 and ttyUSB2. The endpoint to virtual serial port > mapping is like this > ep0 ==> ttyUSB0 > ep1 ==> ttyUSB1 > ep2 ==> ttyUSB2.
Which device is this? I think you are talking about the endpoint "pairs" one IN and one OUT per tty, right? > All I want to do is create another virtual serial port ttyUSB3 (easy) > and setup its endpoint address (bulk in and bulk out) to same as > ttyUSB1 that is ep1. I do this in attach function of the driver and I > want to know will there be any race condition if ttyUSB1 and ttyUSB3 > are used simultaneously? Is there any way to overcome that race > condition or its simply not correct way to go. Does the device really support another serial endpoint? You can't just make a new one if the hardware can't handle it. > My sole intention for doing that is ttyUSB1 and ttyUSB3 should be able > to read/write from/to same endpoint (ep1) concurrently. Is that > possible? Hm, why? Some devices might get very confused, depending on the protocol used by the device. It all depends on the hardware. What's wrong with just having 2 programs write to the same tty node at the same time? thanks, greg k-h - To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
