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SubjectRE: [PATCH] usb: host: xhci-plat: Iterate over parent nodes for finding quirks
Hi Greg,

>-----Original Message-----
>From: Greg Kroah-Hartman []
>Sent: Tuesday, June 05, 2018 8:55 PM
>To: Anurag Kumar Vulisha <>
>Cc: Mathias Nyman <>;; linux-
>Subject: Re: [PATCH] usb: host: xhci-plat: Iterate over parent nodes for finding quirks
>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 <>
>So this is a bugfix? If so, how far back in the kernel releases should it go to?
I feel this is as a bugfix. This problem started with this patch
"usb: xhci: use bus->sysdev for DMA configuration (4c39d4b949d36faf)"
where pdev->dev is replaced with sysdev. If I am not wrong this bug is
present since 4.12 kernel release.

Anurag kumar Vulisha

>greg k-h

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