On Fri, 2 Jun 2006 13:50:14 -0700, Greg KH <[EMAIL PROTECTED]> wrote: > On Fri, Jun 02, 2006 at 12:03:14AM -0300, Luiz Fernando N.Capitulino wrote:
> > 2. The new pl2303's set_termios() can (still) sleep. Serial Core's > > documentation says that that method must not sleep, but I couldn't find > > where in the Serial Core code it's called in atomic context. So, is > > this > > still true? Isn't the Serial Core's documentation out of date? > > If this is true then we should just stop the port right now, as the USB > devices can not handle this. They need to be able to sleep to > accomplish this functionality. > > Russell, is this a requirement of the serial layer? Why? Shouldn't it be all right to schedule the change at the moment of that call and have it happen later? Resisting a temptation to abuse keventd and schedule_work and using a tasklet may help with latency enough to make this tolerable. I'm sure that a generic mechanism to drive asynchronous usb_control_msg is going to be required as well for this project. The pl2303 is just lucky to avoid it. -- Pete _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
