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

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Date:	Tue, 19 May 2015 14:45:19 -0700
From:	Kevin Hilman <khilman@...nel.org>
To:	Thierry Reding <thierry.reding@...il.com>
Cc:	Kevin Hilman <khilman@...nel.org>,
	Scot Doyle <lkml14@...tdoyle.com>,
	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>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2 2/3] fbcon: use the cursor blink interval provided by vt

On Tue, May 19, 2015 at 2:40 PM, Thierry Reding
<thierry.reding@...il.com> wrote:
> On Tue, May 19, 2015 at 02:15:41PM -0700, Kevin Hilman wrote:
>> 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.
>
> FWIW, if I apply the below on top of next-20150519 things seem to be
> back to normal as well:
>
> diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c
> index 05b1d1a71ef9..658c34bb9076 100644
> --- a/drivers/video/console/fbcon.c
> +++ b/drivers/video/console/fbcon.c
> @@ -1310,8 +1310,9 @@ static void fbcon_cursor(struct vc_data *vc, int mode)
>                 return;
>
>         ops->cur_blink_jiffies = msecs_to_jiffies(vc->vc_cur_blink_ms);
> -       fbcon_del_cursor_timer(info);
> -       if (!(vc->vc_cursor_type & 0x10))
> +       if (vc->vc_cursor_type & 0x10)
> +               fbcon_del_cursor_timer(info);
> +       else
>                 fbcon_add_cursor_timer(info);
>
>         ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;

Applying this on next-20150519 makes my exynos board happily boot again as well.

Tested-by: Kevin Hilman <khilman@...aro.org>

Kevin
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