linux-kernel - Re: [PATCH v5] usb: xhci-mtk: fix unreleased bandwidth data

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Message-ID: <1610087648.24856.41.camel@mhfsdcap03>
Date:   Fri, 8 Jan 2021 14:34:08 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Ikjoon Jang <ikjn@...omium.org>
CC:     <linux-mediatek@...ts.infradead.org>, <linux-usb@...r.kernel.org>,
        "Tianping Fang" <tianping.fang@...iatek.com>,
        Zhanyong Wang <zhanyong.wang@...iatek.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5] usb: xhci-mtk: fix unreleased bandwidth data

On Tue, 2020-12-29 at 14:24 +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.
If failed to add an endpoint, will cause failure of its interface
config, then the other endpoints in the same interface will be dropped
later? you mean some endpoints in an interface may fail but without
affecting its function?

> 
> 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: 08e469de87a2 ("usb: xhci-mtk: supports bandwidth scheduling with multi-TT")
> Signed-off-by: Ikjoon Jang <ikjn@...omium.org>