* [PATCH v2] ARM: OMAPFB: panel-sony-acx565akm: fix bad unlock balance
@ 2013-11-11 18:41 ` Aaro Koskinen
0 siblings, 0 replies; 4+ messages in thread
From: Aaro Koskinen @ 2013-11-11 18:41 UTC (permalink / raw)
To: Tomi Valkeinen, linux-omap, linux-fbdev
Cc: Eduardo Valentin, Aaro Koskinen, stable
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>
Cc: stable@vger.kernel.org
---
drivers/video/omap2/displays-new/panel-sony-acx565akm.c | 5 ++---
1 file 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 e6d56f7..d94f35d 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;
--
1.8.4.2
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH v2] ARM: OMAPFB: panel-sony-acx565akm: fix bad unlock balance
@ 2013-11-11 18:41 ` Aaro Koskinen
0 siblings, 0 replies; 4+ messages in thread
From: Aaro Koskinen @ 2013-11-11 18:41 UTC (permalink / raw)
To: Tomi Valkeinen, linux-omap, linux-fbdev
Cc: Eduardo Valentin, Aaro Koskinen, stable
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>
Cc: stable@vger.kernel.org
---
drivers/video/omap2/displays-new/panel-sony-acx565akm.c | 5 ++---
1 file 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 e6d56f7..d94f35d 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;
--
1.8.4.2
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH v2] ARM: OMAPFB: panel-sony-acx565akm: fix bad unlock balance
2013-11-11 18:41 ` Aaro Koskinen
@ 2013-11-18 13:36 ` Tomi Valkeinen
-1 siblings, 0 replies; 4+ messages in thread
From: Tomi Valkeinen @ 2013-11-18 13:36 UTC (permalink / raw)
To: Aaro Koskinen, linux-omap, linux-fbdev; +Cc: Eduardo Valentin, stable
[-- Attachment #1: Type: text/plain, Size: 2088 bytes --]
On 2013-11-11 20:41, 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 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>
> Cc: stable@vger.kernel.org
> ---
> drivers/video/omap2/displays-new/panel-sony-acx565akm.c | 5 ++---
> 1 file 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 e6d56f7..d94f35d 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;
>
>
Thanks, this is better. lock and unlock in different functions makes me
feel very uneasy...
Tomi
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v2] ARM: OMAPFB: panel-sony-acx565akm: fix bad unlock balance
@ 2013-11-18 13:36 ` Tomi Valkeinen
0 siblings, 0 replies; 4+ messages in thread
From: Tomi Valkeinen @ 2013-11-18 13:36 UTC (permalink / raw)
To: Aaro Koskinen, linux-omap, linux-fbdev; +Cc: Eduardo Valentin, stable
[-- Attachment #1: Type: text/plain, Size: 2088 bytes --]
On 2013-11-11 20:41, 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 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>
> Cc: stable@vger.kernel.org
> ---
> drivers/video/omap2/displays-new/panel-sony-acx565akm.c | 5 ++---
> 1 file 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 e6d56f7..d94f35d 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;
>
>
Thanks, this is better. lock and unlock in different functions makes me
feel very uneasy...
Tomi
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 901 bytes --]
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2013-11-18 13:37 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-11-11 18:41 [PATCH v2] ARM: OMAPFB: panel-sony-acx565akm: fix bad unlock balance Aaro Koskinen
2013-11-11 18:41 ` Aaro Koskinen
2013-11-18 13:36 ` Tomi Valkeinen
2013-11-18 13:36 ` Tomi Valkeinen
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