linux-kernel - Re: Regarding usb dwc3 core shutdown callback

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Date:   Thu, 26 Aug 2021 13:43:11 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Sandeep Maheswaram <sanm@...eaurora.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Pratham Pratap <prathampratap@...eaurora.org>,
        Jack Pham <jackp@...eaurora.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Doug Anderson <dianders@...omium.org>
Subject: Re: Regarding usb dwc3 core shutdown callback


Hi,

Sandeep Maheswaram <sanm@...eaurora.org> writes:
>> (why isn't this email plain/text? Content Type was set to multipart
>> alternative, please configure your email client correctly :-)
>>
>> While at that, also make sure to break lines at 80-columns)
>>
>> Sandeep Maheswaram <sanm@...eaurora.org> writes:
>>> Hi,
>>>
>>> Earlier I have posted the patch for usb dwc3 core shutdown callback
>>>
>>> https://lore.kernel.org/linux-arm-msm/1618380209-20114-1-git-send-email-sanm@codeaurora.org/
>>>
>>> and it was reverted due to issues.
>> Right, as should be expected when we find regressions
>>
>>> https://lore.kernel.org/linux-usb/20210603151742.298243-1-alexandru.elisei@arm.com/
>>>
>>> As we already have shutdown callback in xhci plat driver where we halt
>>> the controller, so there will be no transactions with usb devices.
>>>
>>> https://lore.kernel.org/linux-usb/20200306092328.41253-1-ran.wang_1@nxp.com/
>>>
>>> So I think dwc3 core shutdown may not be required at least when we are
>>> using host mode. Let me know your opinion about this.
>> If that's the case, then sure. Please validate the condition, though,
>> and kindly report back on your findings
>
> I have enabled couple of logs in shutdown path and see no URBs
> enqueued after xhci shut down.
>
> Hope this is enough for validation . Please suggest if anything more I
> could do.

how about writing a little script to kexec into another kernel for a few
hundred iterations and make sure things still work after all that?

-- 
balbi