On Mon, 2010-12-20 at 21:33 +0100, Piotr Isajew wrote: > On Mon, Dec 20, 2010 at 03:15:05PM -0500, Alan Stern wrote: > > On Mon, 20 Dec 2010, Piotr Isajew wrote: > > > > > Hello, > > > > > > I would like to get back to this. I've been testing hso with > > > debugging turned on. From what I see, there are sometimes > > > problems with result detaching devices from the bus. From > > > application point of view, at the beginning there is an IO > > > timeout, and then device disappears. Current tests show that > > > device reattaches in a while, application can reopen it and > > > continue it's job. > > > > Your log shows that you are getting lots of hardware communication > > errors. You should check the quality of your USB cables and > > connectors. > > > That could be the point, but it's the system with several modems > connected through 2 external USB hubs. Nobody touches it. After > device reattaches, it works fine for several hours if not days > (no XactErrs then). Before I started to use those hubs I worked > with 3 other from different vendor and there have been similar > symptoms. I would rather bet there is something wrong with Option > modems in general, that makes them irresponsible to the OS under > some circumstances. The question is: can this situation be > handled without disconnecting the device (ie. by increasing > number of retries)? In case you have USB selective suspend enabled, can you disable it and run your test again ? There have been some problems in the past with devices causing Xact errors or detaching from the bus when coming out of suspend. Thanks, Filip- -- 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
