diff options
| author | Aaro Koskinen <aaro.koskinen@iki.fi> | 2013-11-11 20:41:38 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-12-11 22:37:52 -0800 |
| commit | a5d5b2552277039fd09018d8938176853eebfa29 (patch) | |
| tree | e5ded41f42ca801e6cc824bb8b749468304675a3 | |
| parent | 234907dba6f6e98c85b0030f435ba5d94525d52b (diff) | |
ARM: OMAPFB: panel-sony-acx565akm: fix bad unlock balance
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@ti.com>
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/video/omap2/displays-new/panel-sony-acx565akm.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/video/omap2/displays-new/panel-sony-acx565akm.c b/drivers/video/omap2/displays-new/panel-sony-acx565akm.c index e6d56f714ae4..d94f35dbd536 100644 --- 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(struct omap_dss_device *dssdev) 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_dss_device *dssdev) 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; |