usb: host: xhci-plat: Iterate over parent nodes for finding quirks

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

On Tue, Jun 05, 2018 at 08:50:56PM +0530, Anurag Kumar Vulisha wrote:
> In xhci_plat_probe() both sysdev and pdev->dev are being used
> for finding quirks. There are some drivers(like dwc3 host.c)
> which adds quirks(like usb3-lpm-capable) into pdev and the logic
> present in xhci_plat_probe() checks for quirks in either sysdev
> or pdev for finding the quirks. Because of this logic, some of
> the quirks are getting missed(usb3-lpm-capable quirk added by dwc3
> host.c driver is getting missed).This patch fixes this by iterating
> over all the available parents for finding the quirks. In this way
> all the quirks which are present in child or parent are correctly
> updated.
> 
> Signed-off-by: Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com>

So this is a bugfix?  If so, how far back in the kernel releases should
it go to?

thanks,

greg k-h
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