Hello, For some reason, "modprobe -r pl2303" followed by "modprobe pl2303" actually fixes the problem. Thank you all for helping very much. Best regards, Nikola Jelic On Monday, 9. May 2011. 16.07.18 Jon K Hellan wrote: > On 05/09/2011 03:55 PM, Greg KH wrote: > > On Mon, May 09, 2011 at 10:35:42AM +0200, ÐÐÐÐÐÐ ÐÐÐÐÑ wrote: > >> Hello, > >> I have been using Prolific USB to Serial driver (pl2303) for over a > >> year. When I upgraded from 2.6.26 to 2.6.33, the driver lost the > >> ability to send data. When I checked the source code, it seemed that > >> there were some changes in usb- serial interface, pl2303 lost write > >> method, and several calls changed in name and code. > >> Who can I contact in order to work on a patch? I am willing to > >> contribute, but I believe I would require guidance. > > > > What specifically stopped working? > > > > Have you checked your line settings to verify that they are now correct? > > How are you writing to the device from userspace? > > > > The driver changed, yes, but it should still be working. > > Could this have something to do with the issue discussed at > > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/661321 > ("Opening /dev/ttyUSB0 hangs, pl2303.ko module")? > > See in particular Comment 12: > > ".. After much researching it seems this is NOT a driver bug but a > CHANGE in the kernel Serial API semantics. > > What has happened is that the API now blocks when a Serial device is not > indicating it is ready. This included 'open' on a serial device which > now can block. > > Since lots of RS232 serial devices do not bother with any control > signals such as DCD (data carrier detect) they never indicate they are > ready and open blocks. This is the 'HANG' we are seeing. .." > > Regards > > Jon KÃre Hellan, Trondheim, Norway > > > thanks, > > > > greg k-h > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
