[PATCH] usb: core: hub: fix race condition about TRSMRCY of resume

[Chunfeng Yun]

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 at mediatek.com>
> > Signed-off-by: Chunfeng Yun <chunfeng.yun at mediatek.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