linux-kernel - Re: [PATCH] usb: core: hub: fix race condition about TRSMRCY of resume

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Date:   Wed, 12 May 2021 10:02:58 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Alan Stern <stern@...land.harvard.edu>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>,
        Bixuan Cui <cuibixuan@...wei.com>,
        Eugeniu Rosca <erosca@...adit-jv.com>,
        "Oliver Neukum" <oneukum@...e.com>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        Tianping Fang <tianping.fang@...iatek.com>,
        Eddie Hung <eddie.hung@...iatek.com>,
        "Ikjoon Jang" <ikjn@...omium.org>
Subject: Re: [PATCH] usb: core: hub: fix race condition about TRSMRCY of
 resume

On Tue, 2021-05-11 at 13:27 +0200, Greg Kroah-Hartman wrote:
> On Tue, May 11, 2021 at 06:15:22PM +0800, Chunfeng Yun wrote:
> > This may happen if the port becomes resume status exactly
> > when usb_port_resume() gets port status, it still need provide
> > a TRSMCRY time before access the device.
> > 
> > Reported-by: Tianping Fang <tianping.fang@...iatek.com>
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> > ---
> >  drivers/usb/core/hub.c | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> Does this need to go to any older/stable kernels?  If so, how far back?

The flow is changed by 
"b01b03f3ad82 USB: add new routine for checking port-resume type", but
it will cause conflict with
"ad493e5e5805 usb: add usb port auto power off mechanism"
 
> 
> thanks,
> 
> greg k-h