On 2013-11-06 23:24, Aaro Koskinen wrote: > 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 the extra mutex_unlock(). > > Reported-by: Eduardo Valentin <eduardo.valentin@xxxxxx> > Signed-off-by: Aaro Koskinen <aaro.koskinen@xxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > --- > 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; > Hm why would you fix it like this? Why not remove the mutex_unlock from acx565akm_panel_power_on()? Looks to me like that one is the buggy one. Tomi
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