linux-kernel - Re: [REGRESSION next-20170321] acbdad8dd1ab ("serial: 8250_dw: simplify optional reset handling") causes silent kernel.

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Date:   Wed, 22 Mar 2017 16:11:21 +0100
From:   Ralph Sennhauser <ralph.sennhauser@...il.com>
To:     Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION next-20170321] acbdad8dd1ab ("serial: 8250_dw:
 simplify optional reset handling") causes silent kernel.

Hi Philipp

On Wed, 22 Mar 2017 15:33:47 +0100
Philipp Zabel <p.zabel@...gutronix.de> wrote:

> Hi Ralph,
> 
> On Wed, 2017-03-22 at 15:24 +0100, Ralph Sennhauser wrote:
> > Hi Philipp,
> > 
> > Commit acbdad8dd1ab ("serial: 8250_dw: simplify optional reset
> > handling") causes the kernel to no longer print anything to the
> > serial console on a Linksys WRT3200ACM (Armada-385, a similar board
> > would be ./arch/arm/boot/dts/armada-385-linksys-cobra.dts). The
> > last message from uboot is "Starting kernel ..." and then silence.
> > The device boots all the way nonetheless.
> > 
> > Reverting the above commit gets the console output back.
> > 
> > Ralph  
> 
> Thank you for the report. I assume that you are compiling with the
> RESET_CONTROLLER Kconfig option disabled? Does commit 0ca10b60ceeb
>  [1] in
> the arm-soc fixes branch help with this issue?

Yes, RESET_CONTROLLER is not set.

Commit 0ca10b60ceeb ("reset: fix optional reset_control_get stubs to
return NULL") fixes the issue for me.

Thanks
Ralph

> 
> [1]
> https://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc.git/commit/?h=fixes&id=0ca10b60ceeb5372da01798ca68c116ae45a6eb6
> 
> regards
> Philipp
>