linux-kernel - Re: [PATCH 2/2] usb: pci-quirks: Minor cleanup for AMD PLL quirk

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Date:   Fri, 5 Jul 2019 21:29:41 -0400
From:   Ryan Kennedy <ryan5544@...il.com>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Greg KH <gregkh@...uxfoundation.org>, mathias.nyman@...el.com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] usb: pci-quirks: Minor cleanup for AMD PLL quirk

On Fri, Jul 5, 2019 at 3:10 PM Alan Stern <stern@...land.harvard.edu> wrote:
>
> On Thu, 4 Jul 2019, Ryan Kennedy wrote:
>
> > usb_amd_find_chipset_info() is used for chipset detection for
> > several quirks. It is strange that its return value indicates
> > the need for the PLL quirk, which means it is often ignored.
> > This patch adds a function specifically for checking the PLL
> > quirk like the other ones. Additionally, rename probe_result to
> > something more appropriate.
> >
> > Signed-off-by: Ryan Kennedy <ryan5544@...il.com>
>
> > @@ -322,6 +317,13 @@ bool usb_amd_prefetch_quirk(void)
> >  }
> >  EXPORT_SYMBOL_GPL(usb_amd_prefetch_quirk);
> >
> > +bool usb_amd_quirk_pll_check(void)
> > +{
> > +     usb_amd_find_chipset_info();
> > +     return amd_chipset.need_pll_quirk;
> > +}
> > +EXPORT_SYMBOL_GPL(usb_amd_quirk_pll_check);
>
> I really don't see the point of separating out all but one line into a
> different function.  You might as well just rename
> usb_amd_find_chipset_info to usb_amd_quirk_pll_check (along with the
> other code adjustments) and be done with it.

I did this for consistency with the others:

usb_amd_prefetch_quirk()
usb_amd_hang_symptom_quirk()
usb_hcd_amd_remote_wakeup_quirk()

They all need to ensure the chipset information exists then decide if
the particular quirk should be applied to the chipset.

Ryan

>
> However, in the end I don't care if you still want to do this.  Either
> way:
>
> Acked-by: Alan Stern <stern@...land.harvard.edu>
>
> Alan Stern
>