Re: [regression] external HDD in USB3 enclosure cannot bedynamically removed (Re: Linux 3.7.5)

[Sarah Sharp]

Hi Holger,

Can you turn on CONFIG_USB_DEBUG and CONFIG_USB_XHCI_HCD_DEBUGGING,
recompile the 3.7.5 kernel, and send me dmesg starting from the point
you unmount the device and then power it off?

I'd like to keep that patch in stable, but I need to understand what
exactly is failing with it.

Sarah Sharp

On Mon, Jan 28, 2013 at 12:46:39PM -0800, Jonathan Nieder wrote:
> Hi Holger,
> 
> Holger Hoffstaette wrote:
> >> On Mon, Jan 28, 2013 at 12:42:16PM +0100, Holger Hoffstaette wrote:
> 
> >>> Apologies for being late but I'm afraid I just found at least one
> >>> regression in this release.
> >>>
> >>> I have an external HDD in an USB3 enclosure for the occasional backup. I
> >>> turn it on, it gets registered as sdX, I mount it/use it/unmount it and
> >>> turn it off, which worked fine with kernels including 3.7.4. With 3.7.5
> >
> > FWIW it didn't really work with 3.7.4 either - just didn't notice before.
> >
> >>> the kernel seems no longer notified of the changed device power status;
> >>> nothing in dmesg and the device stays in the list of SCSI devices as
> >>> e.g. shown by lsscsi. This is repeatable. Turning the device back
> >>> on/using it works fine, it's just that I cannot dynamically remove it
> >>> any longer.
> [...]
> > No, current 3.8-rc5 did not work either. I first found 3.7.2 OK and 3.7.3
> > bad. Bisecting found:
> >
> > --snip--
> > f7965c0846d74b270e246c1470ca955d5078eb07 is the first bad commit
> > commit f7965c0846d74b270e246c1470ca955d5078eb07
> > Author: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>
> > Date:   Wed Nov 14 17:58:04 2012 -0800
> >
> >     USB: Handle warm reset failure on empty port.
> >
> >     commit 65bdac5effd15d6af619b3b7218627ef4d84ed6a upstream.
> [...]
> > Reverting this from 3.7.3 all the way to 3.8-rc5 makes USB 3.0
> > disconnection/power-off device removal work again. Verified both on the
> > bisection box and by now also the original machine.
> 
> Thanks for tracking this down.  Forwarding to relevant people.
> 
> Hope that helps,
> Jonathan
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