Re: usb-storage multiple usb-sata bridges disconnect themselves sometimes, when growisofs gives error X, retrying enough times gets error Y (and the bridge reset with usb consequences sometimes)

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On Wed, 11 Apr 2012, Reartes Guillermo wrote:

> Alan,
> Thanks for the quick answer.
> >> Messages:
> >> XXXX kernel: [ 6027.939013] usb 2-1.1: reset high-speed USB device
> >> number 7 using ehci_hcd
> >>
> >> When that happens, all said bridges do disconnect and reset.
> >> They came back and remain functional. But sometimes with certain effects.
> >>
> >> Like when (04fc:0c25) was disconnected and reset. it came back, but
> >> the touchpad became sloppy and some false keypresses happened. Reset
> >
> > What touchpad?  Does your DVD drive have a touchpad?
> No, of course :-)
> It did affect my laptop's touchpad (choppy movement) and keyboard (key
> pressed on their own) until i rebooted.
> >> was required. Problem
> > What sort of reset?  The log message above indicates that the device
> > had just been reset; why did it need another reset?
> The growisofs error:
> Input/output error
> happens with such writer attached directly to a sata controller, so it
> is definitivelly not usb related.
> I believe that when such error happens with said writer attached to
> such USB-SATA bridges (or maybe others) sometimes
> the bridge disconnects, resets ans return, instead of giving the same
> error again without disconnecting.

Yes, probably the bridge doesn't know how to handle that kind of error.

>  Or maybe there is another
> error/event/issue that causes the disconnection and reset. I am not
> saying that the reset is wrong, but i am investigating why those
> bridges are being disconnecting.
> > If you want to track this down, you should collect a usbmon trace.
> > Read the instructions in Documentation/usb/usbmon.txt.
> I Captured them when that happened (using the port to where the bridge
> were plugged)
> # cat /sys/kernel/debug/usb/usbmon/2u > ~/file.out
> Two of them are prety big, 3mb (compressed) and one not so much.
> should i upload them somewhere or attach them here?

If you can find a good place, upload them.

Alan Stern

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