linux-kernel - Re: [PATCH] Revert "console: don't prefer first registered if DT specifies stdout-path"

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Date:   Tue, 8 Nov 2016 08:00:32 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Paul Burton <paul.burton@...tec.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Thorsten Leemhuis <regressions@...mhuis.info>,
        Tejun Heo <tj@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "console: don't prefer first registered if DT
 specifies stdout-path"

On Tue, Nov 08, 2016 at 11:46:35AM +1100, Michael Ellerman wrote:
> Hans de Goede <hdegoede@...hat.com> writes:
> 
> > This reverts commit 05fd007e4629 ("console: don't prefer first registered
> > if DT specifies stdout-path").
> >
> > The reverted commit changes existing behavior on which many ARM boards
> > rely. Many ARM small-board-computers, like e.g. the Raspberry Pi have
> > both a video output and a serial console. Depending on whether the user
> > is using the device as a more regular computer; or as a headless device
> > we need to have the console on either one or the other.
> >
> > Many users rely on the kernel behavior of the console being present on
> > both outputs, before the reverted commit the console setup with no
> > console= kernel arguments on an ARM board which sets stdout-path in dt
> > would look like this:
> >
> > [root@...alhost ~]# cat /proc/consoles
> > ttyS0                -W- (EC p a)    4:64
> > tty0                 -WU (E  p  )    4:1
> >
> > Where as after the reverted commit, it looks like this:
> >
> > [root@...alhost ~]# cat /proc/consoles
> > ttyS0                -W- (EC p a)    4:64
> >
> > This commit reverts commit 05fd007e4629 ("console: don't prefer first
> > registered if DT specifies stdout-path") restoring the original behavior.
> >
> > Signed-off-by: Hans de Goede <hdegoede@...hat.com>
> 
> This is also breaking various powerpc systems.
> 
> Linus can you please merge this revert for 4.9 ?

I'll queue it up with other tty changes for 4.9-final.

thanks,

greg k-h