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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/