linux-kernel - [RFC PATCH 0/5] earlycon hang under some conditions

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Date:   Tue, 18 Jul 2017 12:29:58 +0800
From:   Jeffy Chen <jeffy.chen@...k-chips.com>
To:     linux-kernel@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, briannorris@...omium.org,
        dianders@...omium.org, peter@...leysoftware.com,
        Jeffy Chen <jeffy.chen@...k-chips.com>,
        Sören Brinkmann <soren.brinkmann@...inx.com>,
        Michal Simek <michal.simek@...inx.com>,
        Marc Gonzalez <marc_gonzalez@...madesigns.com>,
        Jiri Slaby <jslaby@...e.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        linux-serial@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [RFC PATCH 0/5] earlycon hang under some conditions

I was testing earlycon with 8250 dw serial console. And it hangs in
these cases:
1/ kernel hang when calling early write function after free_initmem:
a) the earlycon not disabled after the init code(due to keep_bootcon or
   not specify a real console to switch to)
b) the early write func is marked as __init, for example 8250_early.

2/ kernel hang when calling early write function after disable unused
clks/pm domain:
a) the earlycon not disabled after the init code
b) the disable unused clks/pm domain kill the requiered clks/pm
   domain, since they are not referenced by the earlycon.

3/ kernel hang when calling early write function after the serial
   console driver runtime suspended:
a) the earlycon not disabled after the init code
b) the serial console driver's runtime suspend kills the requiered
   clks/pm domain, since they are not referenced by the earlycon.

This serial fix 1/ case only.

Jeffy Chen (5):
  serial: arc: Remove __init marking from early write
  serial: omap: Remove __init marking from early write
  serial: xuartps: Remove __init marking from early write
  serial: 8250_ingenic: Remove __init marking from early write
  serial: 8250_early: Remove __init marking from early write

 drivers/tty/serial/8250/8250_early.c   |  8 ++++----
 drivers/tty/serial/8250/8250_ingenic.c |  8 ++++----
 drivers/tty/serial/arc_uart.c          |  4 ++--
 drivers/tty/serial/omap-serial.c       | 13 ++++++-------
 drivers/tty/serial/xilinx_uartps.c     |  2 +-
 5 files changed, 17 insertions(+), 18 deletions(-)

-- 
2.1.4