linux-kernel - Re: [PATCH v2 3/3] usb: xhci-mtk: fix unreleased bandwidth data

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Message-ID: <CAATdQgCZjzoiiReoL-0X5VgWXcEzPsg5B_=SBFFD7dp1Gmvgog@mail.gmail.com>
Date:   Fri, 11 Dec 2020 14:27:35 +0800
From:   Ikjoon Jang <ikjn@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>, linux-usb@...r.kernel.org,
        Zhanyong Wang <zhanyong.wang@...iatek.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Tianping Fang <tianping.fang@...iatek.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] usb: xhci-mtk: fix unreleased bandwidth data

On Thu, Dec 10, 2020 at 6:57 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Thu, Dec 10, 2020 at 06:47:47PM +0800, Ikjoon Jang wrote:
> > xhci-mtk has hooks on add_endpoint() and drop_endpoint() from xhci
> > to handle its own sw bandwidth managements and stores bandwidth data
> > into internal table every time add_endpoint() is called,
> > so when bandwidth allocation fails at one endpoint, all earlier
> > allocation from the same interface could still remain at the table.
> >
> > This patch adds two more hooks from check_bandwidth() and
> > reset_bandwidth(), and make mtk-xhci to releases all failed endpoints
> > from reset_bandwidth().
> >
> > Fixes: 0cbd4b34cda9 ("xhci: mediatek: support MTK xHCI host controller")
> > Signed-off-by: Ikjoon Jang <ikjn@...omium.org>
>
> Shouldn't this be the first patch in the series?  You don't want a fix
> to be dependent on code style changes, otherwise it is really really
> hard to backport it to older kernels that might need this fix, right?

yes, you're right.

This patchset also requires
"4b0f7a77fb3c usb: xhci-mtk: supports bandwidth scheduling with multi-TT",
which doesn't have a Fixes tag.

I think I can change Fixes to point to that commit (4b0f7a77fb3c),
as this unreleased bandwidth data is much more impactful to
TT bandwidth.

Thanks!

>
> Can you re-order these patches please?
>
> thanks,
>
> greg k-h