usb: always build usb/common/ targets; fixes extcon-axp288 build error

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Tue, Apr 17, 2018 at 11:01:41AM +0200, Hans de Goede wrote:
> Hi,
> 
> On 17-04-18 07:14, Randy Dunlap wrote:
> > From: Randy Dunlap <rdunlap@infradead.org>
> > 
> > The extcon-axp288 driver selects USB_ROLE_SWITCH, but the USB
> > Makefile does not currently build drivers/usb/common/ (where
> > USB_ROLE_SWITCH code is) unless USB_COMMON is set, so modify
> > the USB Makefile to always descend into drivers/usb/common/
> > to build its configured targets.
> > 
> > Fixes these build errors:
> > 
> > ERROR: "usb_role_switch_get" [drivers/extcon/extcon-axp288.ko] undefined!
> > ERROR: "usb_role_switch_set_role" [drivers/extcon/extcon-axp288.ko] undefined!
> > ERROR: "usb_role_switch_get_role" [drivers/extcon/extcon-axp288.ko] undefined!
> > ERROR: "usb_role_switch_put" [drivers/extcon/extcon-axp288.ko] undefined!
> > 
> > An alternative patch would be to select USB_COMMON in the EXTCON_AXP288
> > driver Kconfig entry, but this would build more code in
> > drivers/usb/common/ than is necessary.
> 
> Ah, that variant of fixing this got posted yesterday and I acked that,
> but I agree that this version is better.
> 
> Greg, what is your take on this fix?

I'll take the patch from Arnd for this.

thanks,

greg k-h
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