linux-kernel - Re: [PATCH v2 2/3] fbcon: use the cursor blink interval provided by vt

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Message-ID: <CAMAWPa-6ZbE5cDkEZq0XpYa2pHcnf3qweSSVHAXhfhUAUCbKcA@mail.gmail.com>
Date:	Tue, 19 May 2015 14:15:41 -0700
From:	Kevin Hilman <khilman@...nel.org>
To:	Scot Doyle <lkml14@...tdoyle.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Jiri Slaby <jslaby@...e.cz>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Pavel Machek <pavel@....cz>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	lkml <linux-kernel@...r.kernel.org>, linux-fbdev@...r.kernel.org,
	linux-man@...r.kernel.org, linux-api@...r.kernel.org,
	Tyler Baker <tyler.baker@...aro.org>,
	Olof Johansson <olof@...om.net>,
	Daniel Stone <daniel@...ishbar.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2 2/3] fbcon: use the cursor blink interval provided by vt

On Thu, Mar 26, 2015 at 6:56 AM, Scot Doyle <lkml14@...tdoyle.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@...tdoyle.com>
> Acked-by: Pavel Machek <pavel@....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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