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Re: [PATCH 0/5] earlycon hang under some conditions

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  Re: [PATCH 0/5] earlycon hang under some conditions Doug Anderson <dianders@chromium.org> - 2017-07-25 02:00 +0200

#1695291 — Re: [PATCH 0/5] earlycon hang under some conditions

Hi,

On Mon, Jul 17, 2017 at 11:02 PM, Jeffy Chen <jeffy.chen@rock-chips.com> wrote:
> 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(-)

I looked through all 5 patches and they seem sane to me.  I didn't go
through and test them since Brian already tested the patches for the
one UART driver I'd have access to anyway.

As per my previous email, I don't see any need to solve all the
world'd problems with this patch series, plus the keep_bootcon seems
to be an experts / debugging type option and it seems sane if you need
to take care in using it.

So officially for the series (FWIW since I'm just an interested 3rd party):

Reviewed-by: Douglas Anderson <dianders@chromium.org>


-Doug

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