linux-kernel - Re: [PATCH] usb: core: stop USB enumeration if too many retries

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Message-ID: <CAPBYUsA1oARNuGus5uzxZ7Co+gJrm2V_axCPsyZHhp85cndaAg@mail.gmail.com>
Date:   Fri, 2 Sep 2022 17:28:24 +0800
From:   Ray Chi <raychi@...gle.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     mathias.nyman@...ux.intel.com,
        Alan Stern <stern@...land.harvard.edu>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Albert Wang <albertccwang@...gle.com>,
        Badhri Jagan Sridharan <badhri@...gle.com>,
        Puma Hsu <pumahsu@...gle.com>
Subject: Re: [PATCH] usb: core: stop USB enumeration if too many retries

On Tue, Aug 30, 2022 at 8:44 PM Greg KH <gregkh@...uxfoundation.org> wrote:
>
> On Fri, Aug 26, 2022 at 03:58:39PM +0800, Ray Chi wrote:
> > If a broken accessory connected to a USB host, usbcore might
> > keep doing enumeration retries and it will take a long time to
> > cause system unstable.
> >
> > This patch provides a quirk to specific USB ports of the hub to
> > stop USB enumeration if needed.
>
> Where does it ever allow the port to handle new devices in the future if
> the device is removed and then a new one is added back?  Or is the port
> just now dead for forever?
>

I modified the patch according to Alan's suggestion, so the port will
be working again
after clearing the quirk with the v2 patch.

> thanks,
>
> greg k-h

Thanks,
Ray