linux-kernel - Re: [PATCH] USB: hcd: Mark secondary HCD as dead if the primary one died

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Date:   Wed, 26 Jul 2017 19:07:51 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>
Cc:     Linux USB <linux-usb@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>
Subject: Re: [PATCH] USB: hcd: Mark secondary HCD as dead if the primary one died

On Wednesday, July 26, 2017 10:21:54 AM Alan Stern wrote:
> On Tue, 25 Jul 2017, Rafael J. Wysocki wrote:
> 
> > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > 
> > Make usb_hc_died() clear the HCD_FLAG_RH_RUNNING flag for the shared
> > HCD and set HCD_FLAG_DEAD for it, in analogy with what is done for
> > the primary one.
> > 
> > Among other thigs, this prevents check_root_hub_suspended() from
> > returning -EBUSY for dead HCDs which helps to work around system
> > suspend issues in some situations.
> > 
> > This actually fixes occasional suspend failures on one of my test
> > machines.
> > 
> > Suggested-by: Alan Stern <stern@...land.harvard.edu>
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > ---
> >  drivers/usb/core/hcd.c |    2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > Index: linux-pm/drivers/usb/core/hcd.c
> > ===================================================================
> > --- linux-pm.orig/drivers/usb/core/hcd.c
> > +++ linux-pm/drivers/usb/core/hcd.c
> > @@ -2485,6 +2485,8 @@ void usb_hc_died (struct usb_hcd *hcd)
> >  	}
> >  	if (usb_hcd_is_primary_hcd(hcd) && hcd->shared_hcd) {
> >  		hcd = hcd->shared_hcd;
> > +		clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
> > +		set_bit(HCD_FLAG_DEAD, &hcd->flags);
> >  		if (hcd->rh_registered) {
> >  			clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
> 
> Acked-by: Alan Stern <stern@...land.harvard.edu>
> 

Thanks!

I guess this should go in via USB, so Felipe & Greg, please apply or let me
know if you prefer me to handle it.

Thanks,
Rafael