Re: [PATCH] usb: gadget: dummy: don't disconnect on gadget removal

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On Wed, 25 Apr 2012 11:42:47 -0400 (EDT), Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
> On Thu, 19 Apr 2012, Alexander Shishkin wrote:
> > I'm using linux-next, and as of today, the call order is still like I
> > listed before. The change that introduced this order is 8ae8090c (usb:
> > gadget: udc-core: fix asymmetric calls in remove_driver), which is also
> > present in "usb-linus" branch of linux-usb tree (that's how, I assume
> > it's got to linux-next) and Felipe's "fixes" and "master".
> > 
> > So no, I didn't make this up. ;)
> > 
> > The change seems logical though: udc_stop() may have disabled the usb
> > controller, and calling pullup() after that doesn't look very useful.
> Have you tried out this patch?  After I upgraded to 3.4-rc4 I 
> encountered the same problem as you did, and the patch fixed it.
> The two disconnect calls may be redundant; if the UDC driver implements
> a pullup method then setting the pullup to 0 ought to cause the gadget
> driver's disconnect method to be called.

Yes, this reordering fixes the problem.

FWIW, Tested-by: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>

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