Re: linux-3.2.12: usb-storage: Command (unknown command) (16 bytes)

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On Sat, 31 Mar 2012, Martin Mokrejs wrote:

> Alan Stern wrote:
> > On Sat, 31 Mar 2012, Martin Mokrejs wrote:
> > 
> >> 400 kB are probably banned in the list but I haven't received anything returned. :(
> >> Sending to you nbow directly.
> >>
> >> ---
> > 
> >> And, as I just stopped writing on a disk and the JMicron USB-to-SATA bridge decided
> >> to put i a sleep ... I am attaching a log and my .config of running kernel.
> >> It contains also "unknown command" messages. Maybe same cause?
> > 
> > I didn't see any problems in the logs.  I don't know what those 
> > "unknown" commands are, but clearly the drive understands them.
> 
> ? How do you know the drive understands them?

Because the log shows that the drive accepted the commands and carried 
them out instead of returning an "unrecognized command" error.

> > In the future, you should not use CONFIG_USB_STORAGE_DEBUG.  Instead 
> > use usbmon (see the instructions in Documentation/usb/usbmon.txt).
> 
> Thank you for your effort on this and your advice. I will if somebody wants me to do so.

You're welcome.

Alan Stern

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