This is a note to let you know that I've just added the patch titled
ARM: OMAPFB: panel-sony-acx565akm: fix bad unlock balance
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-omapfb-panel-sony-acx565akm-fix-bad-unlock-balance.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c37dd677988ca50bc8bc60ab5ab053720583c168 Mon Sep 17 00:00:00 2001
From: Aaro Koskinen <aaro.koskinen@xxxxxx>
Date: Mon, 11 Nov 2013 20:41:38 +0200
Subject: ARM: OMAPFB: panel-sony-acx565akm: fix bad unlock balance
From: Aaro Koskinen <aaro.koskinen@xxxxxx>
commit c37dd677988ca50bc8bc60ab5ab053720583c168 upstream.
When booting Nokia N900 smartphone with v3.12 + omap2plus_defconfig
(LOCKDEP enabled) and CONFIG_DISPLAY_PANEL_SONY_ACX565AKM enabled,
the following BUG is seen during the boot:
[ 7.302154] =====================================
[ 7.307128] [ BUG: bad unlock balance detected! ]
[ 7.312103] 3.12.0-los.git-2093492-00120-g5e01dc7 #3 Not tainted
[ 7.318450] -------------------------------------
[ 7.323425] kworker/u2:1/12 is trying to release lock (&ddata->mutex) at:
[ 7.330657] [<c031b760>] acx565akm_enable+0x12c/0x18c
[ 7.335998] but there are no more locks to release!
Fix by removing double unlock and handling the locking completely inside
acx565akm_panel_power_on() when doing the power on.
Reported-by: Eduardo Valentin <eduardo.valentin@xxxxxx>
Signed-off-by: Aaro Koskinen <aaro.koskinen@xxxxxx>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/video/omap2/displays-new/panel-sony-acx565akm.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
--- a/drivers/video/omap2/displays-new/panel-sony-acx565akm.c
+++ b/drivers/video/omap2/displays-new/panel-sony-acx565akm.c
@@ -526,6 +526,8 @@ static int acx565akm_panel_power_on(stru
struct omap_dss_device *in = ddata->in;
int r;
+ mutex_lock(&ddata->mutex);
+
dev_dbg(&ddata->spi->dev, "%s\n", __func__);
in->ops.sdi->set_timings(in, &ddata->videomode);
@@ -614,10 +616,7 @@ static int acx565akm_enable(struct omap_
if (omapdss_device_is_enabled(dssdev))
return 0;
- mutex_lock(&ddata->mutex);
r = acx565akm_panel_power_on(dssdev);
- mutex_unlock(&ddata->mutex);
-
if (r)
return r;
Patches currently in stable-queue which might be from aaro.koskinen@xxxxxx are
queue-3.12/arm-omapfb-panel-sony-acx565akm-fix-bad-unlock-balance.patch
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