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Date: Tue, 19 May 2015 14:15:41 -0700
Message-ID: <CAMAWPa-6ZbE5cDkEZq0XpYa2pHcnf3qweSSVHAXhfhUAUCbKcA@mail.gmail.com>
Subject: Re: [PATCH v2 2/3] fbcon: use the cursor blink interval provided by vt
From: Kevin Hilman <khilman@kernel.org>
To: Scot Doyle <lkml14@scotdoyle.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Tomi Valkeinen <tomi.valkeinen@ti.com>,
        Michael Kerrisk <mtk.manpages@gmail.com>, Jiri Slaby <jslaby@suse.cz>,
        Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>,
        Pavel Machek <pavel@ucw.cz>, Geert Uytterhoeven <geert@linux-m68k.org>,
        lkml <linux-kernel@vger.kernel.org>, linux-fbdev@vger.kernel.org,
        linux-man@vger.kernel.org, linux-api@vger.kernel.org,
        Tyler Baker <tyler.baker@linaro.org>, Olof Johansson <olof@lixom.net>,
        Daniel Stone <daniel@fooishbar.org>,
        Thierry Reding <thierry.reding@gmail.com>,
        Arnd Bergmann <arnd@arndb.de>
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On Thu, Mar 26, 2015 at 6:56 AM, Scot Doyle <lkml14@scotdoyle.com> wrote:
> vt now provides a cursor blink interval via vc_data. Use this
> interval instead of the currently hardcoded 200 msecs. Store it in
> fbcon_ops to avoid locking the console in cursor_timer_handler().
>
> Signed-off-by: Scot Doyle <lkml14@scotdoyle.com>
> Acked-by: Pavel Machek <pavel@ucw.cz>

This patch hit next-20150519 in the form of commit 27a4c827c34a
(fbcon: use the cursor blink interval provided by vt) and has caused
boot failure on a handful of ARM platforms when booting a MMC root
filesystem.  This error was spotted by the kernelci.org bot on
exynos5800-peach-pi[1] and Thierry and Daniel (Cc'd) have seen it on
some tegra platforms too.

Thierry spotted this commit as a potential cause, and both Daniel and
I have reverted and boot tested on exynos5 and tegra respectively and
the boot panics disappear.

Kevin

[1] http://storage.kernelci.org/next/next-20150519/arm-exynos_defconfig/lab-khilman/boot-exynos5800-peach-pi_rootfs:mmc.html
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