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

Thierry Reding
2015-05-19T21:40:12Z

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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-enLWO88E2pdl57MIdRCFDg@public.gmane.org> 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-enLWO88E2pdl57MIdRCFDg@public.gmane.org>
> > Acked-by: Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>
>
> 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;

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