I tried to follow up in kernel.org Bugzilla, but it seems broken now. Looks like wvdial gets confused by the kernel behavior. It does not seem directly connected with DCD handling, which my patch aimed to fix, but maybe a side-effect of the change causes this trouble. Andy, would you be so kind as to post an strace log of the wvdial process? I'd prefer to have a complete log from the start of the process if possible. I'm curious what wvdial gets from the kernel. Libor On Mon 28-02-11 11:28:02, Greg KH wrote: > Libor, any ideas? > > On Mon, Feb 28, 2011 at 12:39:53PM +0000, bugzilla-daemon@xxxxxxxxxxxxxxxxxxx wrote: > > https://bugzilla.kernel.org/show_bug.cgi?id=30072 > > > > Summary: USB-to-serial problems in 2.6.37.1+ (pl2303) > > Product: Drivers > > Version: 2.5 > > Kernel Version: 2.6.37.1 > > Platform: All > > OS/Version: Linux > > Tree: Mainline > > Status: NEW > > Severity: high > > Priority: P1 > > Component: USB > > AssignedTo: greg@xxxxxxxxx > > ReportedBy: akwatts@xxxxxxxxx > > Regression: Yes > > > > > > As of 2.6.37.1, using a pl2303 usb<->serial converter (trendnet tu-s9) > > connected to an external serial modem fails on re-connect > > (disconnect -> connect cycle). > > > > Sometimes, after disconnecting ppp (either with SIGKILL, SIGTERM, or SIGHUP) > > and trying to reconnect, wvdial (the dialer) uses 100% of cpu and hangs at > > the following lines: > > > > wvdial: WvDial: Internet dialer version 1.61 > > wvdial: Initializing modem. > > wvdial: Sending: ATZ [sometimes hangs at previous line] > > > > This behavior is noticed most when the ppp line remains open but the > > connection has died (upstream). A keep-alive type script detects that > > the line is effectively dead and tries to restart ppp. > > > > I've identified the commit which causes this behavior as: > > > > commit d14fc1a74e846d7851f24fc9519fe87dc12a1231 > > Author: Libor Pechacek <lpechacek@xxxxxxx> > > Date: Fri Jan 14 14:30:21 2011 +0100 > > USB: serial: handle Data Carrier Detect changes > > > > Backing this commit out returns the system to normal behavior and the > > pl2303-driven modem can disconnect/reconnect without issues. > > > > ~ Andy > > > > -- > > Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email > > ------- You are receiving this mail because: ------- > > You are the assignee for the bug. -- Libor Pechacek SUSE L3 Team, Prague -- 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
