On Wed, 30 Apr 2014, Dave Mielke wrote: > The kernel being used is 3.5.0-17-generic. Have you tried 3.14? 3.5 is getting old. > I'm working with a device for which this operation is known to work on Windows. What operation? > When I use usbfs, however, the bulk input transfer is yielding ETIME (error > 62). This is true both synchronously (using ioctl[USBDEVFS_BULK]) and > asynchronously (in which case urb->status contains -62). Our log shows the > following: > > 2014-04-30@20:12:46.140 USB: reading endpoint: 1 > 2014-04-30@20:12:46.140 USB: ept=81 dir=in xfr=blk pkt=64 ivl=0ms > 2014-04-30@20:12:46.140 USB: clearing endpoint: 81 > 2014-04-30@20:12:46.150 USB bulk transfer error 62: Timer expired. > > My understanding is that ETIME means that the device isn't responding. Given Correct. > that our log is showing only 10 milliseconds between the clear halt and the > bulk read, however, I'm doubting that that's the cause. Why not? Maybe the device can't handle the Clear-Halt properly. Its firmware crashes and it stops responding to packets sent by the host. > What else might it be? A bug in the host controller hardware or driver, perhaps. But that seems rather unlikely. 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
