[U-Boot] [PATCH v2] test: ums: Add sleep before unmount directory

[Wolfgang Denk <wd@denx.de>]

Dear Stephen,

In message <545D40E1.2030700@wwwdotorg.org> you wrote:
>
> > My gut feeling is that there might be some USB driver error involved
> > here.
> 
> Where I've seen this is writing to an SD card in a USB-based SD card reader.
> 
> I have a fairly regular amd64 machine running Ubuntu. I put the loop 
> above into my own scripts that mount an SD card, copy new data to it, 
> and then immediately unmount it for the same reason that Lukasz made 
> this patch; umount doesn't always unmount. I did this so long ago that I 
> don't recall which Ubuntu version I had at the time, nor the kernel 
> version. It was *probably* Ubuntu 10.04 or 12.10 though. Now I'm on 
> 14.04, but have no idea if I still need the loop since it's already in 
> place:-)

But this is a bug.  Papering over is not a good idea.  It should be
analyzed, reported, and finally fixed.

Best regards,

Wolfgang Denk

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