On Sun, 3 Apr 2011, Jools Wills wrote: > From bug https://bugzilla.kernel.org/show_bug.cgi?id=32432 - I was > advised to post it here. patch referred to is on bugtracker. > > After commit b963801164618e25fbdc0cd452ce49c3628b46c8 > (USB: ehci-hcd unlink speedups) I have instability with an external USB > drive > on a Intel Mac Mini. USB device will stop working after some > minutes/hours/or a > few days. > > Manually reverting the commit fixes it and the USB device is completely > stable. > I spent a long time trying to track the bug down, firstly trying every > single > USB quirk mode and kernel configs, and eventually found reverting this > commit > fixed it. I am currently running a 2.6.27 kernel with the attached > patch. The > patch still applies to GIT HEAD as of 01/04/2011 > > The errors looked like > > Jun 7 22:56:05 malus kernel: usb 1-1: reset high speed USB device using > ehci_hcd and address 2 > Jun 7 22:56:16 malus kernel: usb 1-1: reset high speed USB device using > ehci_hcd and address 2 > Jun 7 22:56:19 malus kernel: usb 1-1: USB disconnect, address 2 > Jun 7 22:56:20 malus kernel: sd 4:0:0:0: Device offlined - not ready > after error recovery This really isn't enough information to help much. To collect more info, build your kernel with CONFIG_USB_DEBUG enabled. Don't post the contents of the log file; instead post the output from the dmesg command. Finally, it would also be a big help to see a usbmon trace showing what happens when one of these problems occurs. Instructions are in the kernel source file Documentation/usb/usbmon.txt. You'll get a lot of output; only the last few tens of KB leading up to the problem will be of interest. > the usb device in question: > root@malus:/usr/local/src# cat /proc/scsi/usb-storage/4 > Host scsi4: usb-storage > Vendor: Super Top > Product: USB 2.0 IDE DEVICE > Serial Number: ST Killer > Protocol: Transparent SCSI > Transport: Bulk > Quirks: IGNORE_RESIDUE > > Has a quirk active by default, but as everything was fine prior to the patch > and the fact that I am not the only person who has had issues with this > commit, > I wonder if there is a problem in the code somewhere or something that > could be > done. Not until we know exactly what's going wrong. > Other people with issues pointing to that commit > > http://lkml.org/lkml/2009/5/22/405 (USB/DVB - Old Technotrend TT-connect > S-2400 > regression tracked down) This was found to be a completely separate cause. The fix was included in 2.6.31. > http://kerneltrap.com/mailarchive/linux-usb/2008/12/19/4459054/thread > 9usb: Fix > PS3 EHCI suspend) That may have been related, but I doubt it. The problem there occurred only when the device was suspended, and you're not suspending your disk drive. > let me know if I can provide other information. The machine is question is a > production machine in a hosting facility, so my priority was to get this > working as I have now. Start with the items mentioned above. We can go on from there. 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
