linux-kernel - Re: [PATCH v2] ARM: exynos: add debug_ll_io_init() call in exynos_init

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Message-ID: <CAOesGMhQX9ip=nb9AQa5fcDFRNpZZSxUO0N0GTX051dakWZD9Q@mail.gmail.com>
Date:	Wed, 5 Jun 2013 14:12:17 -0700
From:	Olof Johansson <olof@...om.net>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Kukjin Kim <kgene.kim@...sung.com>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Simon Glass <sjg@...omium.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Ben Dooks <ben-linux@...ff.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] ARM: exynos: add debug_ll_io_init() call in exynos_init_io()

On Wed, Jun 5, 2013 at 1:56 PM, Doug Anderson <dianders@...omium.org> wrote:
> If the early MMU mapping of the UART happens to get booted out of the
> TLB between the start of paging_init() and when we finally re-add the
> UART at the very end of s3c_init_cpu(), we'll get a hang at bootup if
> we've got early_printk enabled.  Avoid this hang by calling
> debug_ll_io_init() early.
>
> Without this patch, you can reliably reproduce a hang when early
> printk is enabled by adding flush_tlb_all() at the start of
> exynos_init_io().  After this patch the hang goes away.
>
> Signed-off-by: Doug Anderson <dianders@...omium.org>

Acked-by: Olof Johansson <olof@...om.net>


Kukjin, this seems appropriate for 3.10. Do you have other fixes
queued or should I apply this directly?


-Olof
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