Re: [Xen-devel] Re: [updated] Re: [PATCH] USB virtualisation (experimental)

[Mark Williamson <Mark.Williamson@xxxxxxxxxxxx>]

> I'd say it is just a trivial bug in the kernel USB stuff - expecting
> some reply to always arrive, when it doesn't if the drive is unplugged
> at the unfortunate moment (or the drive dies, as in this case).

I was just wondering if it was in the storage driver, the low level host 
controller driver or maybe the USB core code.  If all USB devices stop 
working, it suggests one of the latter two, otherwise it suggests the former 
and shouldn't even stop other USB storage devices from working.

> ohci_hcd: 2004 Feb 02 USB 1.1 'Open' Host Controller (OHCI) Driver (PCI)

I didn't think OHCI was very common on PCs but I guess

> Dmesg of an unsuccessful plugging in of the drive:
>
> usb 3-5: new high speed USB device using address 5
> scsi2 : SCSI emulation for USB Mass Storage devices

Yuk!

The USB storage code has a certain amount of statefulness, so if it's hanging 
for that drive once, it may stop it working for the rest of the uptime.  If 
the bug is in the USB storage code, you'll probably find that other storage 
devices still work, otherwise it may be somewhere else.

Cheers,
Mark


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