linux-kernel - Re: USB broken on Banana Pi in Linux 4.6

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Message-ID: <20160611125504.GA4572@torres.zugschlus.de>
Date:	Sat, 11 Jun 2016 14:55:04 +0200
From:	Marc Haber <mh+linux-kernel@...schlus.de>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-usb@...r.kernel.org
Subject: Re: USB broken on Banana Pi in Linux 4.6

On Tue, Jun 07, 2016 at 10:30:17AM -0700, Greg KH wrote:
> Nothing obvious, can you use 'git bisect' to go from 4.5.0 to 4.6.0 to
> find the offending commit?

I can. The first round of bisecting let me end up with
c8b710b3e4348119924051551b836c94835331b1 as the first bad commit,
which is wrong, since c8b710b3e4348119924051551b836c94835331b1^ is bad
as well. I am not sure whether things went well since I had to use git
bisect skip twice because the resulting kernel wouldn't boot on the pi.

A second round of bisecting left me in limbo, since I do not
understand this:

[45/544]mh@fan[zgchroot kernel64][debian_chroot sid_kernel64]:~/linux/debug/linux$ git bisect reset
HEAD is now at 2dcd0af... Linux 4.6
[46/545]mh@fan[zgchroot kernel64][debian_chroot sid_kernel64]:~/linux/debug/linux$ git bisect start
[47/546]mh@fan[zgchroot kernel64][debian_chroot sid_kernel64]:~/linux/debug/linux$ git bisect bad
[48/547]mh@fan[zgchroot kernel64][debian_chroot sid_kernel64]:~/linux/debug/linux$ git bisect bad c8b710b3e4348119924051551b836c94835331b1^
[49/548]mh@fan[zgchroot kernel64][debian_chroot sid_kernel64]:~/linux/debug/linux$ git bisect good v4.5
Some good revs are not ancestor of the bad rev.
git bisect cannot work properly in this case.
Maybe you mistook good and bad revs?
[50/549]mh@fan[zgchroot kernel64][debian_chroot sid_kernel64]:~/linux/debug/linux$

Do I need to start over completely?

Greetings
Marc

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