lkml.org 
[lkml]   [2008]   [Aug]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: 2.6.27-rc4: 90% system time because of khubd, unable to reboot
Date
On Friday, 22 of August 2008, Andrey Borzenkov wrote:
> On Friday 22 August 2008, Alan Stern wrote:
> > On Fri, 22 Aug 2008, Andrey Borzenkov wrote:
> >
> > > > > reverting 38b375d9610e2467cb793a84d17c6f65e44cdb39 fixed it
> > > > >
> > > >
> > > > ... that is:
> > > >
> > > > commit 38b375d9610e2467cb793a84d17c6f65e44cdb39
> > > > Author: Alan Stern <stern@rowland.harvard.edu>
> > > > Date: Mon Jul 21 09:56:26 2008 -0400
> > > >
> > > > USB: OHCI: fix system hang caused by earlier patch
> > > >
> > > > Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
> > > > Tested by: Andrey Borzenkov <arvidjaar@mail.ru>
> > > > Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
> > > >
> > > > so it apparently used to work for you at that time. What gives?
> > > >
> > >
> > > Well, you should not commit a fix without commiting code that has been
> > > fixed first :)
> >
> > Actually the code to be fixed _was_ committed first -- but then it was
> > reverted before the fix was accepted, so the fix was merged without it.
> >
> > My advice is not to worry about it. That code has been sent once again
> > to Linus -- it's not merged yet but presumably it will be soon.
> > Certainly before 2.6.27-rc5 appears.
> >
> > On the other hand, I still have to wonder how the fix could have caused
> > your problem without the original patch in place. The fix itself
> > should have been totally innocuous.
> >
>
> It looks even funnier. Right now I am running with commits
> 38b375d9610e2467cb793a84d17c6f65e44cdb39 *and*
> e872154921a6b5256a3c412dd69158ac0b135176 reverted. I.e. this should be
> the state which hopelessly failed in 2.6.26-rc. It seems to be doing
> quite well now in 2.6.27-rc.
>
> "git revert e872154921a6b5256a3c412dd69158ac0b135176" gives me this
> one liner patch:
>
> commit f3cf9ad86ee76077d1c6be9af7d197aa13ccdff9
> Author: Andrey Borzenkov <arvidjaar@mail.ru>
> Date: Fri Aug 22 21:15:26 2008 +0400
>
> Revert "USB: don't explicitly reenable root-hub status interrupts"
>
> This reverts commit e872154921a6b5256a3c412dd69158ac0b135176.
>
> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index 107e1d2..d30f822 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -3086,6 +3086,11 @@ static void hub_events(void)
> if (!hdev->parent && !hub->busy_bits[0])
> usb_enable_root_hub_irq(hdev->bus);
>
> + /* If this is a root hub, tell the HCD it's okay to
> + * re-enable port-change interrupts now. */
> + if (!hdev->parent && !hub->busy_bits[0])
> + usb_enable_root_hub_irq(hdev->bus);
> +
> loop_autopm:
> /* Allow autosuspend if we're not going to run again */
> if (list_empty(&hub->event_list))
>
> Either my git tree is completely botched or most parts were already reverted
> before.
>
> So the problem seems to have cured by itself between 2.6.26 and 2.6.27?

Well, such things happened in the past.

I won't add this to the list of regressions for now, but please monitor the
status of -rc5 and let me know if the problem reappears in there.

Thanks,
Rafael



\
 
 \ /
  Last update: 2008-08-22 20:29    [W:0.051 / U:0.088 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site