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

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Message-ID: <YJpqJr/3XEIYrtko@kroah.com>
Date:   Tue, 11 May 2021 13:27:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>
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, 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?

thanks,

greg k-h