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Date: Fri, 4 Nov 2016 12:39:03 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Hans de Goede <hdegoede@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Paul Burton <paul.burton@imgtec.com>, Rob Herring <robh+dt@kernel.org>,
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        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Tejun Heo <tj@kernel.org>, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Revert
 "console: don't prefer first registered if DT specifies stdout-path"
Message-Id: <20161104123903.0693053785eb32f63822ac33@linux-foundation.org>
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        <20161104121135.4780-2-hdegoede@redhat.com>
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On Fri,  4 Nov 2016 13:11:35 +0100 Hans de Goede <hdegoede@redhat.com> wrote:

> 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@localhost ~]# 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@localhost ~]# 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@redhat.com>

I've added cc:stable@vger.kernel.org to my copy of this.