From mboxrd@z Thu Jan 1 00:00:00 1970 From: Aaro Koskinen Date: Wed, 06 Nov 2013 21:24:30 +0000 Subject: [PATCH] ARM: OMAPFB: panel-sony-acx565akm: fix bad unlock balance Message-Id: <1383773070-15114-1-git-send-email-aaro.koskinen@iki.fi> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Tomi Valkeinen , linux-omap@vger.kernel.org, linux-fbdev@vger.kernel.org Cc: Eduardo Valentin , Aaro Koskinen , stable@vger.kernel.org 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] [] acx565akm_enable+0x12c/0x18c [ 7.335998] but there are no more locks to release! Fix by removing the extra mutex_unlock(). Reported-by: Eduardo Valentin Signed-off-by: Aaro Koskinen Cc: stable@vger.kernel.org --- drivers/video/omap2/displays-new/panel-sony-acx565akm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/video/omap2/displays-new/panel-sony-acx565akm.c b/drivers/video/omap2/displays-new/panel-sony-acx565akm.c index e6d56f7..72fe2a8 100644 --- a/drivers/video/omap2/displays-new/panel-sony-acx565akm.c +++ b/drivers/video/omap2/displays-new/panel-sony-acx565akm.c @@ -616,7 +616,7 @@ static int acx565akm_enable(struct omap_dss_device *dssdev) mutex_lock(&ddata->mutex); r = acx565akm_panel_power_on(dssdev); - mutex_unlock(&ddata->mutex); + /* NOTE: acx565akm_panel_power_on() will unlock the mutex. */ if (r) return r; -- 1.8.4.2