linux-kernel - Re: [PATCH 1/2] usb: pci-quirks: Correct AMD PLL quirk detection

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Message-ID: <20190705052208.GE15821@kroah.com>
Date:   Fri, 5 Jul 2019 07:22:08 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Ryan Kennedy <ryan5544@...il.com>
Cc:     mathias.nyman@...el.com, stern@...land.harvard.edu,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] usb: pci-quirks: Correct AMD PLL quirk detection

On Thu, Jul 04, 2019 at 11:35:28AM -0400, Ryan Kennedy wrote:
> The AMD PLL USB quirk is incorrectly enabled on newer Ryzen
> chipsets. The logic in usb_amd_find_chipset_info currently checks
> for unaffected chipsets rather than affected ones. This broke
> once a new chipset was added in e788787ef. It makes more sense
> to reverse the logic so it won't need to be updated as new
> chipsets are added. Note that the core of the workaround in
> usb_amd_quirk_pll does correctly check the chipset.
> 
> Signed-off-by: Ryan Kennedy <ryan5544@...il.com>
> ---
>  drivers/usb/host/pci-quirks.c | 31 +++++++++++++++++++------------
>  1 file changed, 19 insertions(+), 12 deletions(-)

Should this be backported to stable kernels?

thanks,

greg k-h