On Thu, 17 Oct 2013, Sarah Sharp wrote: > > Given the difficulty (or rather the infrequency) of reproducing the > > problem I'd like to sort out the failing code path before changing > > kernels so that I can then verify that a more recent kernel fixes it. > > The problem is that -ESHUTDOWN usually means there's a driver or host > controller issue. Numerous bug fixes have gone in since 3.4 to avoid > such host controller issues. It would be a waste of time for me to > attempt debug your issue, only to discover it had been fixed in a more > recent kernel. So I would really rather you test on a stable kernel, > see if the issue still occurs, and then we can work from a known good > base to figure out where the problem is. -ESHUTDOWN really indicates either that the system believes the device has been disconnected from the USB bus or that the host controller itself has stopped working. > > To clarify the fail trace below is from an xhci controller, but > > I'm pretty sure we've seen a tx lockup when using ohci. > > Then it might not be an xHCI host specific issue. Undoubtedly not. > > The usbmon trace when the tx locks up starts with: > > > > > > Two Bo 'fail -71', 6 succeed, one fails -32 the rest fail -104. > > > > done:9871:6913:60 ffff88020ea16a80 293818155 C Bo:3:003:2 -71 EPROTO 512 > > > > > done:9872:6927:59 ffff88020ea16f00 293818235 C Bo:3:003:2 -71 EPROTO 0 Those -71 errors indicate a low-level problem. It generally means that the device has stopped sending packets. Perhaps its firmware has crashed, or perhaps it has disconnected itself electrically from the bus. > > Last successful ethernet transmit > > ffff88020c4870c0 701760986 C Bo:3:018:2 0 1090 > > > ffff88020c4870c0 701760992 S Bo:3:018:2 -115 1090 > > = 3a340000 3a440000 22003200 00224d98 > > d8460002 1f0057d7 08004500 042879ca > > Interrupt - I think from the root hub. > > ffff88020c8570c0 701761038 C Ii:3:001:1 0:2048 1 = 02 > > ffff88020c8570c0 701761042 S Ii:3:001:1 -115:2048 4 < > > ffff88020ea16840 701761046 C Ii:3:018:3 -71:1 0 EPROTO > > ffff88020ea16840 701761047 S Ii:3:018:3 -115:1 16 < > > ffff88020c53c480 701761051 C Bi:3:018:1 -71 0 > > ffff88020c487180 701761054 C Bo:3:018:2 -71 1024 > > > ffff880210570240 701761063 S Ci:3:001:0 s a3 00 0000 0001 0004 4 < > > ffff880210570240 701761071 C Ci:3:001:0 0 4 = 00010100 These last two lines show the host controller telling the system that the device has disconnected. Once that happens, any future communication with the device is hopeless. Alan Stern -- 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
