On Tue, 25 Jul 2017, Rafael J. Wysocki wrote:
> On Tuesday, July 25, 2017 05:59:04 PM Rafael J. Wysocki wrote:
> > On Tuesday, July 25, 2017 10:05:03 AM Alan Stern wrote:
> > > On Tue, 25 Jul 2017, Rafael J. Wysocki wrote:
> > >
> > > > From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> > > >
> > > > If HCD_DEAD(hcd) is "true" in check_root_hub_suspended(), it is
> > > > rather pointless to check the secondary root hub, so return early
> > > > then.
> > > >
> > > > This actually fixes occasional suspend failures on one of my test
> > > > machines.
> > > >
> > > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> > > > ---
> > > > drivers/usb/core/hcd-pci.c | 3 +++
> > > > 1 file changed, 3 insertions(+)
> > > >
> > > > Index: linux-pm/drivers/usb/core/hcd-pci.c
> > > > ===================================================================
> > > > --- linux-pm.orig/drivers/usb/core/hcd-pci.c
> > > > +++ linux-pm/drivers/usb/core/hcd-pci.c
> > > > @@ -427,6 +427,9 @@ static int check_root_hub_suspended(stru
> > > > dev_warn(dev, "Root hub is not suspended\n");
> > > > return -EBUSY;
> > > > }
> > > > + if (HCD_DEAD(hcd))
> > > > + return 0;
> > > > +
> > > > if (hcd->shared_hcd) {
> > > > hcd = hcd->shared_hcd;
> > > > if (HCD_RH_RUNNING(hcd)) {
> > >
> > > While this is an okay solution, IMO it would be more reliable and more
> > > general to have usb_hc_died() clear the HCD_FLAG_RH_RUNNING bit and set
> > > the HCD_FLAG_DEAD bit in the shared hcd. Right now it only does these
> > > things for the primary.
> > >
> > > Would you like to write and test a patch to do that?
> >
> > I can do that.
>
> Just to make sure that we are on the same page, is the below what you mean?
>
> ---
> 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);
Yes, exactly. Does it fix your suspend problem?
Alan Stern
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