On Wed, 2010-03-31 at 10:56 -0400, Alan Stern wrote: > On Wed, 31 Mar 2010, Jonas Schwertfeger wrote: > > > Since this seems to have become a udev issue I'm brining the > > hotplug/udev list into the loop. > > > > A brief recap for the hotplug list readers: I'm experiencing issues > > with a USB 3.0 hard drive (Buffalo HD-HXU3) on kernel 2.6.32.9 with > > udev 151. When connected the device seems to be recognized and > > registered with xHCI and USB core correctly but then responds to a > > bulk transfer with a stall. We narrowed the issue down to udev by > > stopping the udev daemon, connecting the device and mounting it > > manually. If done this way the drive works fine. However, if udevd is > > running the device stalls. Below is an excerpt of the conversation > > involving the USB core, the USB storage and the SCSI list. > > > > Any idea what command (most likely coming from udev) could cause the > > drive to stall and what could be done about it? > > More specifically, what program issues ATA-passthrough commands? And > what can be done to prevent it from doing so in cases where these > commands cause the device to crash? Stock udev comes with ata_id which I think may be invoked for this device (but I'm not sure). Try moving it out of the way? On most distros, udisks (also known as DeviceKit-disks before the name was changed) is installed which runs a small program that uses libatasmart to determine if the device is SMART capable: http://cgit.freedesktop.org/udisks/tree/src/probers/udisks-probe-ata-smart.c and this definitely runs for this USB device assuming removable is 0 in sysfs. Perhaps http://bugs.freedesktop.org/show_bug.cgi?id=25673 is related? Maybe try with the latest libatasmart? Thanks, David -- 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
