linux-kernel - Re: [PATCH] serial: core: fix console problems on uart

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Date:   Tue, 25 Oct 2016 15:29:05 +0200
From:   Mike Galbraith <umgwanakikbuti@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Mugunthan V N <mugunthanvnm@...com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Peter Hurley <peter@...leysoftware.com>,
        Alan Cox <alan@...ux.intel.com>, Jiri Slaby <jslaby@...e.com>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>
Subject: Re: [PATCH] serial: core: fix console problems on uart_close

On Tue, 2016-10-25 at 08:25 -0500, Rob Herring wrote:
> On Tue, Oct 25, 2016 at 7:55 AM, Mike Galbraith
> <umgwanakikbuti@...il.com> wrote:
> > On Tue, 2016-10-25 at 12:40 +0200, Geert Uytterhoeven wrote:
> > 
> > > Mike: I see you are using a PC, while I'm using an ARM board (with DT).
> > > Are you using a serial console? If yes, what's the value of port->console
> > > before and after the call to uart_console() that Rob's patch below removes?
> > 
> > Well, it's a bit larger than the average PC, it's a 64 core HP DL980,
> > and my console is its virtual serial port.
> > 
> > [   15.217487] Serial: 8250/16550 driver, 32 ports, IRQ sharing disabled
> > [   15.228212] MIKE port:ffff880276400000 port->console:0
> > [   15.240889] MIKE port:ffff880276400000 port->console:0
> > [   15.269606] 00:03: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
> > [   15.282538] MIKE port:ffff8802764001a8 port->console:0
> > [   15.293195] MIKE port:ffff8802764001a8 port->console:1
> > [   15.322806] serial8250: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A
> > (30 more calls, all 0 pre 0 post)
> > 
> > That's with the below from Jiri Slaby applied to quell the reboot time
> > explosion.
> 
> This alone is enough to fix things for you?

Yup.

	-Mike