linux-kernel - Re: [PATCH] usb: host: xhci-plat: add a shutdown

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Message-ID: <158373545061.66766.10321933903764965708@swboyd.mtv.corp.google.com>
Date:   Sun, 08 Mar 2020 23:30:50 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Ran Wang <ran.wang_1@....com>
Cc:     Peter Chen <peter.chen@....com>, Jun Li <jun.li@....com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ran Wang <ran.wang_1@....com>
Subject: Re: [PATCH] usb: host: xhci-plat: add a shutdown

Quoting Ran Wang (2020-03-06 01:23:28)
> When loading new kernel via kexec, we need to shutdown host controller to
> avoid any un-expected memory accessing during new kernel boot.
> 
> Signed-off-by: Ran Wang <ran.wang_1@....com>
> Reviewed-by: Peter Chen <peter.chen@....com>
> ---

Tested-by: Stephen Boyd <swboyd@...omium.org>

This fixes a problem I see where USB is still active during an orderly
reboot.