[PATCH 0/4] [media] Media entity cleanups and build fixes

[PATCH 0/4] [media] Media entity cleanups and build fixes

[Javier Martinez Canillas]

Hello,

This series contains a couple of build fixes and cleanups for the
Media Controller framework. The goal of the series is to get rid of
the struct media_entity .parent member since now that a media_gobj is
embedded into entities, the media_gobj .mdev member can be used to
store a pointer to the parent struct media_device.

So the .parent field becomes redundant and can be removed after all
the users are converted to use entity .graph_obj.mdev instead.

Patches 1/4 and 2/4 are build fixes I found while build testing if no
regressions were introduced by the conversion. Patch 3/4 converts
all the drivers and the MC core to use .mdev instead of .parent and
finally patch 4/4 removes the .parent field since now is unused.

The series depend on Mauro's "[PATCH v6 0/8] MC preparation patches
series" [0].

The transformation were automated using a coccinelle semantic patch
and the drivers were build tested using allyesconfig and x-building
the ARM Exynos and OMAP defconfigs + the needed media config options.

Best regards,
Javier

[0]: http://www.mail-archive.com/linux-media@vger.kernel.org/msg91330.html


Javier Martinez Canillas (4):
  [media] staging: omap4iss: get entity ID using media_entity_id()
  [media] omap3isp: get entity ID using media_entity_id()
  [media] media: use entity.graph_obj.mdev instead of .parent
  [media] media: remove media entity .parent field

 drivers/media/media-device.c                       |  8 ++---
 drivers/media/media-entity.c                       | 34 ++++++++++++----------
 drivers/media/platform/exynos4-is/fimc-isp-video.c |  6 ++--
 drivers/media/platform/exynos4-is/fimc-lite.c      |  8 ++---
 drivers/media/platform/exynos4-is/media-dev.c      |  2 +-
 drivers/media/platform/exynos4-is/media-dev.h      |  8 ++---
 drivers/media/platform/omap3isp/isp.c              | 11 ++++---
 drivers/media/platform/omap3isp/ispccdc.c          |  2 +-
 drivers/media/platform/omap3isp/ispvideo.c         | 10 ++++---
 drivers/media/platform/vsp1/vsp1_video.c           |  2 +-
 drivers/media/platform/xilinx/xilinx-dma.c         |  2 +-
 drivers/staging/media/davinci_vpfe/vpfe_video.c    |  6 ++--
 drivers/staging/media/omap4iss/iss.c               |  6 ++--
 drivers/staging/media/omap4iss/iss_video.c         |  4 +--
 include/media/media-entity.h                       |  1 -
 15 files changed, 58 insertions(+), 52 deletions(-)

-- 
2.4.3

[PATCH 1/4] [media] staging: omap4iss: get entity ID using media_entity_id()

[Javier Martinez Canillas]

The struct media_entity does not have an .id field anymore since
now the entity ID is stored in the embedded struct media_gobj.

This caused the omap4iss driver fail to build. Fix by using the
media_entity_id() macro to obtain the entity ID.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
---

 drivers/staging/media/omap4iss/iss.c       | 2 +-
 drivers/staging/media/omap4iss/iss_video.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/media/omap4iss/iss.c b/drivers/staging/media/omap4iss/iss.c
index f32ab7b98ae2..7226553ceb2f 100644
--- a/drivers/staging/media/omap4iss/iss.c
+++ b/drivers/staging/media/omap4iss/iss.c
@@ -607,7 +607,7 @@ static int iss_pipeline_disable(struct iss_pipeline *pipe,
 			 * crashed. Mark it as such, the ISS will be reset when
 			 * applications will release it.
 			 */
-			iss->crashed |= 1U << subdev->entity.id;
+			iss->crashed |= 1U << media_entity_id(&subdev->entity);
 			failure = -ETIMEDOUT;
 		}
 	}
diff --git a/drivers/staging/media/omap4iss/iss_video.c b/drivers/staging/media/omap4iss/iss_video.c
index bae67742706f..25e9e7a6b99d 100644
--- a/drivers/staging/media/omap4iss/iss_video.c
+++ b/drivers/staging/media/omap4iss/iss_video.c
@@ -784,7 +784,7 @@ iss_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
 	entity = &video->video.entity;
 	media_entity_graph_walk_start(&graph, entity);
 	while ((entity = media_entity_graph_walk_next(&graph)))
-		pipe->entities |= 1 << entity->id;
+		pipe->entities |= 1 << media_entity_id(entity);
 
 	/* Verify that the currently configured format matches the output of
 	 * the connected subdev.
-- 
2.4.3

Re: [PATCH 1/4] [media] staging: omap4iss: get entity ID using media_entity_id()

[Laurent Pinchart]

Hi Javier,

Thank you for the patch.

On Wednesday 19 August 2015 17:35:19 Javier Martinez Canillas wrote:
> The struct media_entity does not have an .id field anymore since
> now the entity ID is stored in the embedded struct media_gobj.
> 
> This caused the omap4iss driver fail to build. Fix by using the
> media_entity_id() macro to obtain the entity ID.
> 
> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>

This looks fine to me. The patch needs to be moved between Mauro's 1/8 and 2/8 
patches to avoid breaking bisection with patch 3/8. I'd squash this patch and 
2/4 into a single "media: Use media_entity_id() in drivers" patch.

> ---
> 
>  drivers/staging/media/omap4iss/iss.c       | 2 +-
>  drivers/staging/media/omap4iss/iss_video.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/media/omap4iss/iss.c
> b/drivers/staging/media/omap4iss/iss.c index f32ab7b98ae2..7226553ceb2f
> 100644
> --- a/drivers/staging/media/omap4iss/iss.c
> +++ b/drivers/staging/media/omap4iss/iss.c
> @@ -607,7 +607,7 @@ static int iss_pipeline_disable(struct iss_pipeline
> *pipe, * crashed. Mark it as such, the ISS will be reset when
>  			 * applications will release it.
>  			 */
> -			iss->crashed |= 1U << subdev->entity.id;
> +			iss->crashed |= 1U << media_entity_id(&subdev->entity);
>  			failure = -ETIMEDOUT;
>  		}
>  	}
> diff --git a/drivers/staging/media/omap4iss/iss_video.c
> b/drivers/staging/media/omap4iss/iss_video.c index
> bae67742706f..25e9e7a6b99d 100644
> --- a/drivers/staging/media/omap4iss/iss_video.c
> +++ b/drivers/staging/media/omap4iss/iss_video.c
> @@ -784,7 +784,7 @@ iss_video_streamon(struct file *file, void *fh, enum
> v4l2_buf_type type) entity = &video->video.entity;
>  	media_entity_graph_walk_start(&graph, entity);
>  	while ((entity = media_entity_graph_walk_next(&graph)))
> -		pipe->entities |= 1 << entity->id;
> +		pipe->entities |= 1 << media_entity_id(entity);
> 
>  	/* Verify that the currently configured format matches the output of
>  	 * the connected subdev.

-- 
Regards,

Laurent Pinchart

Re: [PATCH 1/4] [media] staging: omap4iss: get entity ID using media_entity_id()

[Javier Martinez Canillas]

Hello Laurent,

On 08/20/2015 08:37 PM, Laurent Pinchart wrote:
> Hi Javier,
> 
> Thank you for the patch.
> 
> On Wednesday 19 August 2015 17:35:19 Javier Martinez Canillas wrote:
>> The struct media_entity does not have an .id field anymore since
>> now the entity ID is stored in the embedded struct media_gobj.
>>
>> This caused the omap4iss driver fail to build. Fix by using the
>> media_entity_id() macro to obtain the entity ID.
>>
>> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
> 
> This looks fine to me. The patch needs to be moved between Mauro's 1/8 and 2/8 
> patches to avoid breaking bisection with patch 3/8. I'd squash this patch and 
> 2/4 into a single "media: Use media_entity_id() in drivers" patch.
> 

Yes, Hans and Mauro already mentioned it and I completely agree that
should be squashed with Mauro's patch to maintain git bisect-ability.

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America

Re: [PATCH 1/4] [media] staging: omap4iss: get entity ID using media_entity_id()

[Laurent Pinchart]

Hi Javier,

On Friday 21 August 2015 02:14:05 Javier Martinez Canillas wrote:
> On 08/20/2015 08:37 PM, Laurent Pinchart wrote:
> > On Wednesday 19 August 2015 17:35:19 Javier Martinez Canillas wrote:
> >> The struct media_entity does not have an .id field anymore since
> >> now the entity ID is stored in the embedded struct media_gobj.
> >> 
> >> This caused the omap4iss driver fail to build. Fix by using the
> >> media_entity_id() macro to obtain the entity ID.
> >> 
> >> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
> > 
> > This looks fine to me. The patch needs to be moved between Mauro's 1/8 and
> > 2/8 patches to avoid breaking bisection with patch 3/8. I'd squash this
> > patch and 2/4 into a single "media: Use media_entity_id() in drivers"
> > patch.
>
> Yes, Hans and Mauro already mentioned it and I completely agree that
> should be squashed with Mauro's patch to maintain git bisect-ability.

I wouldn't squash patches 1/4 and 2/4 into Mauro's 3/8 patch as Hans proposed, 
but instead squashing them together into a single patch and move the result as 
1.5/8 in Mauro's series.

-- 
Regards,

Laurent Pinchart

Re: [PATCH 1/4] [media] staging: omap4iss: get entity ID using media_entity_id()

[Javier Martinez Canillas]

Hello Laurent,

On 08/21/2015 02:15 AM, Laurent Pinchart wrote:
> Hi Javier,
> 
> On Friday 21 August 2015 02:14:05 Javier Martinez Canillas wrote:
>> On 08/20/2015 08:37 PM, Laurent Pinchart wrote:
>>> On Wednesday 19 August 2015 17:35:19 Javier Martinez Canillas wrote:
>>>> The struct media_entity does not have an .id field anymore since
>>>> now the entity ID is stored in the embedded struct media_gobj.
>>>>
>>>> This caused the omap4iss driver fail to build. Fix by using the
>>>> media_entity_id() macro to obtain the entity ID.
>>>>
>>>> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
>>>
>>> This looks fine to me. The patch needs to be moved between Mauro's 1/8 and
>>> 2/8 patches to avoid breaking bisection with patch 3/8. I'd squash this
>>> patch and 2/4 into a single "media: Use media_entity_id() in drivers"
>>> patch.
>>
>> Yes, Hans and Mauro already mentioned it and I completely agree that
>> should be squashed with Mauro's patch to maintain git bisect-ability.
> 
> I wouldn't squash patches 1/4 and 2/4 into Mauro's 3/8 patch as Hans proposed, 
> but instead squashing them together into a single patch and move the result as 
> 1.5/8 in Mauro's series.
> 

I see. I don't mind either option tbh, I'm OK with whatever works better.

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America

Re: [PATCH 1/4] [media] staging: omap4iss: get entity ID using media_entity_id()

[Hans Verkuil]

On 08/21/2015 02:15 AM, Laurent Pinchart wrote:
> Hi Javier,
> 
> On Friday 21 August 2015 02:14:05 Javier Martinez Canillas wrote:
>> On 08/20/2015 08:37 PM, Laurent Pinchart wrote:
>>> On Wednesday 19 August 2015 17:35:19 Javier Martinez Canillas wrote:
>>>> The struct media_entity does not have an .id field anymore since
>>>> now the entity ID is stored in the embedded struct media_gobj.
>>>>
>>>> This caused the omap4iss driver fail to build. Fix by using the
>>>> media_entity_id() macro to obtain the entity ID.
>>>>
>>>> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
>>>
>>> This looks fine to me. The patch needs to be moved between Mauro's 1/8 and
>>> 2/8 patches to avoid breaking bisection with patch 3/8. I'd squash this
>>> patch and 2/4 into a single "media: Use media_entity_id() in drivers"
>>> patch.
>>
>> Yes, Hans and Mauro already mentioned it and I completely agree that
>> should be squashed with Mauro's patch to maintain git bisect-ability.
> 
> I wouldn't squash patches 1/4 and 2/4 into Mauro's 3/8 patch as Hans proposed, 
> but instead squashing them together into a single patch and move the result as 
> 1.5/8 in Mauro's series.
> 

I agree with Laurent, this is a better solution.

Regards,

	Hans

[PATCH 2/4] [media] omap3isp: get entity ID using media_entity_id()

[Javier Martinez Canillas]

The struct media_entity does not have an .id field anymore since
now the entity ID is stored in the embedded struct media_gobj.

This caused the omap3isp driver fail to build. Fix by using the
media_entity_id() macro to obtain the entity ID.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
---

 drivers/media/platform/omap3isp/isp.c      | 7 +++++--
 drivers/media/platform/omap3isp/ispccdc.c  | 2 +-
 drivers/media/platform/omap3isp/ispvideo.c | 8 +++++---
 3 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/media/platform/omap3isp/isp.c b/drivers/media/platform/omap3isp/isp.c
index d6b2922ed55c..6351f35b0a65 100644
--- a/drivers/media/platform/omap3isp/isp.c
+++ b/drivers/media/platform/omap3isp/isp.c
@@ -975,6 +975,7 @@ static int isp_pipeline_disable(struct isp_pipeline *pipe)
 	struct v4l2_subdev *subdev;
 	int failure = 0;
 	int ret;
+	u32 id;
 
 	/*
 	 * We need to stop all the modules after CCDC first or they'll
@@ -1027,8 +1028,10 @@ static int isp_pipeline_disable(struct isp_pipeline *pipe)
 		if (ret) {
 			dev_info(isp->dev, "Unable to stop %s\n", subdev->name);
 			isp->stop_failure = true;
-			if (subdev == &isp->isp_prev.subdev)
-				isp->crashed |= 1U << subdev->entity.id;
+			if (subdev == &isp->isp_prev.subdev) {
+				id = media_entity_id(&subdev->entity);
+				isp->crashed |= 1U << id;
+			}
 			failure = -ETIMEDOUT;
 		}
 	}
diff --git a/drivers/media/platform/omap3isp/ispccdc.c b/drivers/media/platform/omap3isp/ispccdc.c
index 3fe425f254bb..27555e4f4aa8 100644
--- a/drivers/media/platform/omap3isp/ispccdc.c
+++ b/drivers/media/platform/omap3isp/ispccdc.c
@@ -1608,7 +1608,7 @@ static int ccdc_isr_buffer(struct isp_ccdc_device *ccdc)
 	/* Wait for the CCDC to become idle. */
 	if (ccdc_sbl_wait_idle(ccdc, 1000)) {
 		dev_info(isp->dev, "CCDC won't become idle!\n");
-		isp->crashed |= 1U << ccdc->subdev.entity.id;
+		isp->crashed |= 1U << media_entity_id(&ccdc->subdev.entity);
 		omap3isp_pipeline_cancel_stream(pipe);
 		return 0;
 	}
diff --git a/drivers/media/platform/omap3isp/ispvideo.c b/drivers/media/platform/omap3isp/ispvideo.c
index 3094572f8897..6c89dc40df85 100644
--- a/drivers/media/platform/omap3isp/ispvideo.c
+++ b/drivers/media/platform/omap3isp/ispvideo.c
@@ -235,7 +235,7 @@ static int isp_video_get_graph_data(struct isp_video *video,
 	while ((entity = media_entity_graph_walk_next(&graph))) {
 		struct isp_video *__video;
 
-		pipe->entities |= 1 << entity->id;
+		pipe->entities |= 1 << media_entity_id(entity);
 
 		if (far_end != NULL)
 			continue;
@@ -891,6 +891,7 @@ static int isp_video_check_external_subdevs(struct isp_video *video,
 	struct v4l2_ext_control ctrl;
 	unsigned int i;
 	int ret;
+	u32 id;
 
 	/* Memory-to-memory pipelines have no external subdev. */
 	if (pipe->input != NULL)
@@ -898,7 +899,7 @@ static int isp_video_check_external_subdevs(struct isp_video *video,
 
 	for (i = 0; i < ARRAY_SIZE(ents); i++) {
 		/* Is the entity part of the pipeline? */
-		if (!(pipe->entities & (1 << ents[i]->id)))
+		if (!(pipe->entities & (1 << media_entity_id(ents[i]))))
 			continue;
 
 		/* ISP entities have always sink pad == 0. Find source. */
@@ -950,7 +951,8 @@ static int isp_video_check_external_subdevs(struct isp_video *video,
 
 	pipe->external_rate = ctrl.value64;
 
-	if (pipe->entities & (1 << isp->isp_ccdc.subdev.entity.id)) {
+	id = media_entity_id(&isp->isp_ccdc.subdev.entity);
+	if (pipe->entities & (1 << id)) {
 		unsigned int rate = UINT_MAX;
 		/*
 		 * Check that maximum allowed CCDC pixel rate isn't
-- 
2.4.3

[PATCH 3/4] [media] media: use entity.graph_obj.mdev instead of .parent

[Javier Martinez Canillas]

The struct media_entity has a .parent field that stores a pointer
to the parent struct media_device. But recently a media_gobj was
embedded into the entities and since struct media_gojb already has
a pointer to a struct media_device in the .mdev field, the .parent
field becomes redundant and can be removed.

This patch replaces all the usage of .parent by .graph_obj.mdev so
that field will become unused and can be removed on a later patch.

No functional changes.

The transformation was made using the following coccinelle spatch:

@@
struct media_entity *me;
@@

- me->parent
+ me->graph_obj.mdev

@@
struct media_entity *link;
@@

- link->source->entity->parent
+ link->source->entity->graph_obj.mdev

@@
struct exynos_video_entity *ve;
@@

- ve->vdev.entity.parent
+ ve->vdev.entity.graph_obj.mdev

Suggested-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
---

 drivers/media/media-device.c                       |  8 ++---
 drivers/media/media-entity.c                       | 34 ++++++++++++----------
 drivers/media/platform/exynos4-is/fimc-isp-video.c |  6 ++--
 drivers/media/platform/exynos4-is/fimc-lite.c      |  8 ++---
 drivers/media/platform/exynos4-is/media-dev.c      |  2 +-
 drivers/media/platform/exynos4-is/media-dev.h      |  8 ++---
 drivers/media/platform/omap3isp/isp.c              |  4 +--
 drivers/media/platform/omap3isp/ispvideo.c         |  2 +-
 drivers/media/platform/vsp1/vsp1_video.c           |  2 +-
 drivers/media/platform/xilinx/xilinx-dma.c         |  2 +-
 drivers/staging/media/davinci_vpfe/vpfe_video.c    |  6 ++--
 drivers/staging/media/omap4iss/iss.c               |  4 +--
 drivers/staging/media/omap4iss/iss_video.c         |  2 +-
 13 files changed, 45 insertions(+), 43 deletions(-)

diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
index 0f3844470147..138b18416460 100644
--- a/drivers/media/media-device.c
+++ b/drivers/media/media-device.c
@@ -435,8 +435,8 @@ int __must_check media_device_register_entity(struct media_device *mdev,
 	int i;
 
 	/* Warn if we apparently re-register an entity */
-	WARN_ON(entity->parent != NULL);
-	entity->parent = mdev;
+	WARN_ON(entity->graph_obj.mdev != NULL);
+	entity->graph_obj.mdev = mdev;
 
 	spin_lock(&mdev->lock);
 	/* Initialize media_gobj embedded at the entity */
@@ -471,7 +471,7 @@ EXPORT_SYMBOL_GPL(media_device_register_entity);
 void media_device_unregister_entity(struct media_entity *entity)
 {
 	int i;
-	struct media_device *mdev = entity->parent;
+	struct media_device *mdev = entity->graph_obj.mdev;
 
 	if (mdev == NULL)
 		return;
@@ -484,7 +484,7 @@ void media_device_unregister_entity(struct media_entity *entity)
 	media_gobj_remove(&entity->graph_obj);
 	list_del(&entity->list);
 	spin_unlock(&mdev->lock);
-	entity->parent = NULL;
+	entity->graph_obj.mdev = NULL;
 }
 EXPORT_SYMBOL_GPL(media_device_unregister_entity);
 
diff --git a/drivers/media/media-entity.c b/drivers/media/media-entity.c
index 35e52cd1fc5a..a23c93369a04 100644
--- a/drivers/media/media-entity.c
+++ b/drivers/media/media-entity.c
@@ -332,7 +332,7 @@ EXPORT_SYMBOL_GPL(media_entity_graph_walk_next);
 __must_check int media_entity_pipeline_start(struct media_entity *entity,
 					     struct media_pipeline *pipe)
 {
-	struct media_device *mdev = entity->parent;
+	struct media_device *mdev = entity->graph_obj.mdev;
 	struct media_entity_graph graph;
 	struct media_entity *entity_err = entity;
 	int ret;
@@ -387,7 +387,7 @@ __must_check int media_entity_pipeline_start(struct media_entity *entity,
 
 			ret = entity->ops->link_validate(link);
 			if (ret < 0 && ret != -ENOIOCTLCMD) {
-				dev_dbg(entity->parent->dev,
+				dev_dbg(entity->graph_obj.mdev->dev,
 					"link validation failed for \"%s\":%u -> \"%s\":%u, error %d\n",
 					link->source->entity->name,
 					link->source->index,
@@ -401,7 +401,7 @@ __must_check int media_entity_pipeline_start(struct media_entity *entity,
 
 		if (!bitmap_full(active, entity->num_pads)) {
 			ret = -EPIPE;
-			dev_dbg(entity->parent->dev,
+			dev_dbg(entity->graph_obj.mdev->dev,
 				"\"%s\":%u must be connected by an enabled link\n",
 				entity->name,
 				(unsigned)find_first_zero_bit(
@@ -454,7 +454,7 @@ EXPORT_SYMBOL_GPL(media_entity_pipeline_start);
  */
 void media_entity_pipeline_stop(struct media_entity *entity)
 {
-	struct media_device *mdev = entity->parent;
+	struct media_device *mdev = entity->graph_obj.mdev;
 	struct media_entity_graph graph;
 
 	mutex_lock(&mdev->graph_mutex);
@@ -490,8 +490,8 @@ struct media_entity *media_entity_get(struct media_entity *entity)
 	if (entity == NULL)
 		return NULL;
 
-	if (entity->parent->dev &&
-	    !try_module_get(entity->parent->dev->driver->owner))
+	if (entity->graph_obj.mdev->dev &&
+	    !try_module_get(entity->graph_obj.mdev->dev->driver->owner))
 		return NULL;
 
 	return entity;
@@ -511,8 +511,8 @@ void media_entity_put(struct media_entity *entity)
 	if (entity == NULL)
 		return;
 
-	if (entity->parent->dev)
-		module_put(entity->parent->dev->driver->owner);
+	if (entity->graph_obj.mdev->dev)
+		module_put(entity->graph_obj.mdev->dev->driver->owner);
 }
 EXPORT_SYMBOL_GPL(media_entity_put);
 
@@ -561,7 +561,8 @@ media_create_pad_link(struct media_entity *source, u16 source_pad,
 	link->flags = flags;
 
 	/* Initialize graph object embedded at the new link */
-	media_gobj_init(source->parent, MEDIA_GRAPH_LINK, &link->graph_obj);
+	media_gobj_init(source->graph_obj.mdev, MEDIA_GRAPH_LINK,
+			&link->graph_obj);
 
 	/* Create the backlink. Backlinks are used to help graph traversal and
 	 * are not reported to userspace.
@@ -577,7 +578,8 @@ media_create_pad_link(struct media_entity *source, u16 source_pad,
 	backlink->flags = flags;
 
 	/* Initialize graph object embedded at the new link */
-	media_gobj_init(sink->parent, MEDIA_GRAPH_LINK, &backlink->graph_obj);
+	media_gobj_init(sink->graph_obj.mdev, MEDIA_GRAPH_LINK,
+			&backlink->graph_obj);
 
 	link->reverse = backlink;
 	backlink->reverse = link;
@@ -629,12 +631,12 @@ EXPORT_SYMBOL_GPL(__media_entity_remove_links);
 void media_entity_remove_links(struct media_entity *entity)
 {
 	/* Do nothing if the entity is not registered. */
-	if (entity->parent == NULL)
+	if (entity->graph_obj.mdev == NULL)
 		return;
 
-	mutex_lock(&entity->parent->graph_mutex);
+	mutex_lock(&entity->graph_obj.mdev->graph_mutex);
 	__media_entity_remove_links(entity);
-	mutex_unlock(&entity->parent->graph_mutex);
+	mutex_unlock(&entity->graph_obj.mdev->graph_mutex);
 }
 EXPORT_SYMBOL_GPL(media_entity_remove_links);
 
@@ -703,7 +705,7 @@ int __media_entity_setup_link(struct media_link *link, u32 flags)
 	    (source->stream_count || sink->stream_count))
 		return -EBUSY;
 
-	mdev = source->parent;
+	mdev = source->graph_obj.mdev;
 
 	if (mdev->link_notify) {
 		ret = mdev->link_notify(link, flags,
@@ -724,9 +726,9 @@ int media_entity_setup_link(struct media_link *link, u32 flags)
 {
 	int ret;
 
-	mutex_lock(&link->source->entity->parent->graph_mutex);
+	mutex_lock(&link->source->entity->graph_obj.mdev->graph_mutex);
 	ret = __media_entity_setup_link(link, flags);
-	mutex_unlock(&link->source->entity->parent->graph_mutex);
+	mutex_unlock(&link->source->entity->graph_obj.mdev->graph_mutex);
 
 	return ret;
 }
diff --git a/drivers/media/platform/exynos4-is/fimc-isp-video.c b/drivers/media/platform/exynos4-is/fimc-isp-video.c
index b7dc5ac66e36..3d9ccbf5f10f 100644
--- a/drivers/media/platform/exynos4-is/fimc-isp-video.c
+++ b/drivers/media/platform/exynos4-is/fimc-isp-video.c
@@ -288,7 +288,7 @@ static int isp_video_open(struct file *file)
 		goto rel_fh;
 
 	if (v4l2_fh_is_singular_file(file)) {
-		mutex_lock(&me->parent->graph_mutex);
+		mutex_lock(&me->graph_obj.mdev->graph_mutex);
 
 		ret = fimc_pipeline_call(ve, open, me, true);
 
@@ -296,7 +296,7 @@ static int isp_video_open(struct file *file)
 		if (ret == 0)
 			me->use_count++;
 
-		mutex_unlock(&me->parent->graph_mutex);
+		mutex_unlock(&me->graph_obj.mdev->graph_mutex);
 	}
 	if (!ret)
 		goto unlock;
@@ -312,7 +312,7 @@ static int isp_video_release(struct file *file)
 	struct fimc_isp *isp = video_drvdata(file);
 	struct fimc_is_video *ivc = &isp->video_capture;
 	struct media_entity *entity = &ivc->ve.vdev.entity;
-	struct media_device *mdev = entity->parent;
+	struct media_device *mdev = entity->graph_obj.mdev;
 
 	mutex_lock(&isp->video_lock);
 
diff --git a/drivers/media/platform/exynos4-is/fimc-lite.c b/drivers/media/platform/exynos4-is/fimc-lite.c
index e8f707d1729b..b2607da4ad14 100644
--- a/drivers/media/platform/exynos4-is/fimc-lite.c
+++ b/drivers/media/platform/exynos4-is/fimc-lite.c
@@ -500,7 +500,7 @@ static int fimc_lite_open(struct file *file)
 	    atomic_read(&fimc->out_path) != FIMC_IO_DMA)
 		goto unlock;
 
-	mutex_lock(&me->parent->graph_mutex);
+	mutex_lock(&me->graph_obj.mdev->graph_mutex);
 
 	ret = fimc_pipeline_call(&fimc->ve, open, me, true);
 
@@ -508,7 +508,7 @@ static int fimc_lite_open(struct file *file)
 	if (ret == 0)
 		me->use_count++;
 
-	mutex_unlock(&me->parent->graph_mutex);
+	mutex_unlock(&me->graph_obj.mdev->graph_mutex);
 
 	if (!ret) {
 		fimc_lite_clear_event_counters(fimc);
@@ -541,9 +541,9 @@ static int fimc_lite_release(struct file *file)
 		fimc_pipeline_call(&fimc->ve, close);
 		clear_bit(ST_FLITE_IN_USE, &fimc->state);
 
-		mutex_lock(&entity->parent->graph_mutex);
+		mutex_lock(&entity->graph_obj.mdev->graph_mutex);
 		entity->use_count--;
-		mutex_unlock(&entity->parent->graph_mutex);
+		mutex_unlock(&entity->graph_obj.mdev->graph_mutex);
 	}
 
 	_vb2_fop_release(file, NULL);
diff --git a/drivers/media/platform/exynos4-is/media-dev.c b/drivers/media/platform/exynos4-is/media-dev.c
index 3ba76940eef5..92dbade2fffc 100644
--- a/drivers/media/platform/exynos4-is/media-dev.c
+++ b/drivers/media/platform/exynos4-is/media-dev.c
@@ -1046,7 +1046,7 @@ static int __fimc_md_modify_pipeline(struct media_entity *entity, bool enable)
 	return ret;
 }
 
-/* Locking: called with entity->parent->graph_mutex mutex held. */
+/* Locking: called with entity->graph_obj.mdev->graph_mutex mutex held. */
 static int __fimc_md_modify_pipelines(struct media_entity *entity, bool enable)
 {
 	struct media_entity *entity_err = entity;
diff --git a/drivers/media/platform/exynos4-is/media-dev.h b/drivers/media/platform/exynos4-is/media-dev.h
index 03214541f149..9a69913b31cb 100644
--- a/drivers/media/platform/exynos4-is/media-dev.h
+++ b/drivers/media/platform/exynos4-is/media-dev.h
@@ -164,8 +164,8 @@ struct fimc_sensor_info *source_to_sensor_info(struct fimc_source_info *si)
 
 static inline struct fimc_md *entity_to_fimc_mdev(struct media_entity *me)
 {
-	return me->parent == NULL ? NULL :
-		container_of(me->parent, struct fimc_md, media_dev);
+	return me->graph_obj.mdev == NULL ? NULL :
+		container_of(me->graph_obj.mdev, struct fimc_md, media_dev);
 }
 
 static inline struct fimc_md *notifier_to_fimc_md(struct v4l2_async_notifier *n)
@@ -175,12 +175,12 @@ static inline struct fimc_md *notifier_to_fimc_md(struct v4l2_async_notifier *n)
 
 static inline void fimc_md_graph_lock(struct exynos_video_entity *ve)
 {
-	mutex_lock(&ve->vdev.entity.parent->graph_mutex);
+	mutex_lock(&ve->vdev.entity.graph_obj.mdev->graph_mutex);
 }
 
 static inline void fimc_md_graph_unlock(struct exynos_video_entity *ve)
 {
-	mutex_unlock(&ve->vdev.entity.parent->graph_mutex);
+	mutex_unlock(&ve->vdev.entity.graph_obj.mdev->graph_mutex);
 }
 
 int fimc_md_set_camclk(struct v4l2_subdev *sd, bool on);
diff --git a/drivers/media/platform/omap3isp/isp.c b/drivers/media/platform/omap3isp/isp.c
index 6351f35b0a65..aa13b17d19a0 100644
--- a/drivers/media/platform/omap3isp/isp.c
+++ b/drivers/media/platform/omap3isp/isp.c
@@ -787,7 +787,7 @@ int omap3isp_pipeline_pm_use(struct media_entity *entity, int use)
 	int change = use ? 1 : -1;
 	int ret;
 
-	mutex_lock(&entity->parent->graph_mutex);
+	mutex_lock(&entity->graph_obj.mdev->graph_mutex);
 
 	/* Apply use count to node. */
 	entity->use_count += change;
@@ -798,7 +798,7 @@ int omap3isp_pipeline_pm_use(struct media_entity *entity, int use)
 	if (ret < 0)
 		entity->use_count -= change;
 
-	mutex_unlock(&entity->parent->graph_mutex);
+	mutex_unlock(&entity->graph_obj.mdev->graph_mutex);
 
 	return ret;
 }
diff --git a/drivers/media/platform/omap3isp/ispvideo.c b/drivers/media/platform/omap3isp/ispvideo.c
index 6c89dc40df85..4c367352b1f7 100644
--- a/drivers/media/platform/omap3isp/ispvideo.c
+++ b/drivers/media/platform/omap3isp/ispvideo.c
@@ -226,7 +226,7 @@ static int isp_video_get_graph_data(struct isp_video *video,
 {
 	struct media_entity_graph graph;
 	struct media_entity *entity = &video->video.entity;
-	struct media_device *mdev = entity->parent;
+	struct media_device *mdev = entity->graph_obj.mdev;
 	struct isp_video *far_end = NULL;
 
 	mutex_lock(&mdev->graph_mutex);
diff --git a/drivers/media/platform/vsp1/vsp1_video.c b/drivers/media/platform/vsp1/vsp1_video.c
index debe4e539df6..1f94c1a54e00 100644
--- a/drivers/media/platform/vsp1/vsp1_video.c
+++ b/drivers/media/platform/vsp1/vsp1_video.c
@@ -409,7 +409,7 @@ static int vsp1_pipeline_validate(struct vsp1_pipeline *pipe,
 {
 	struct media_entity_graph graph;
 	struct media_entity *entity = &video->video.entity;
-	struct media_device *mdev = entity->parent;
+	struct media_device *mdev = entity->graph_obj.mdev;
 	unsigned int i;
 	int ret;
 
diff --git a/drivers/media/platform/xilinx/xilinx-dma.c b/drivers/media/platform/xilinx/xilinx-dma.c
index f7f9aa353a55..92e8116dc28f 100644
--- a/drivers/media/platform/xilinx/xilinx-dma.c
+++ b/drivers/media/platform/xilinx/xilinx-dma.c
@@ -181,7 +181,7 @@ static int xvip_pipeline_validate(struct xvip_pipeline *pipe,
 {
 	struct media_entity_graph graph;
 	struct media_entity *entity = &start->video.entity;
-	struct media_device *mdev = entity->parent;
+	struct media_device *mdev = entity->graph_obj.mdev;
 	unsigned int num_inputs = 0;
 	unsigned int num_outputs = 0;
 
diff --git a/drivers/staging/media/davinci_vpfe/vpfe_video.c b/drivers/staging/media/davinci_vpfe/vpfe_video.c
index 61a8d5beff58..92573fa852a9 100644
--- a/drivers/staging/media/davinci_vpfe/vpfe_video.c
+++ b/drivers/staging/media/davinci_vpfe/vpfe_video.c
@@ -130,7 +130,7 @@ __vpfe_video_get_format(struct vpfe_video_device *video,
 static void vpfe_prepare_pipeline(struct vpfe_video_device *video)
 {
 	struct media_entity *entity = &video->video_dev.entity;
-	struct media_device *mdev = entity->parent;
+	struct media_device *mdev = entity->graph_obj.mdev;
 	struct vpfe_pipeline *pipe = &video->pipe;
 	struct vpfe_video_device *far_end = NULL;
 	struct media_entity_graph graph;
@@ -288,7 +288,7 @@ static int vpfe_pipeline_enable(struct vpfe_pipeline *pipe)
 	else
 		entity = &pipe->inputs[0]->video_dev.entity;
 
-	mdev = entity->parent;
+	mdev = entity->graph_obj.mdev;
 	mutex_lock(&mdev->graph_mutex);
 	media_entity_graph_walk_start(&graph, entity);
 	while ((entity = media_entity_graph_walk_next(&graph))) {
@@ -328,7 +328,7 @@ static int vpfe_pipeline_disable(struct vpfe_pipeline *pipe)
 	else
 		entity = &pipe->inputs[0]->video_dev.entity;
 
-	mdev = entity->parent;
+	mdev = entity->graph_obj.mdev;
 	mutex_lock(&mdev->graph_mutex);
 	media_entity_graph_walk_start(&graph, entity);
 
diff --git a/drivers/staging/media/omap4iss/iss.c b/drivers/staging/media/omap4iss/iss.c
index 7226553ceb2f..40591963b42b 100644
--- a/drivers/staging/media/omap4iss/iss.c
+++ b/drivers/staging/media/omap4iss/iss.c
@@ -494,7 +494,7 @@ int omap4iss_pipeline_pm_use(struct media_entity *entity, int use)
 	int change = use ? 1 : -1;
 	int ret;
 
-	mutex_lock(&entity->parent->graph_mutex);
+	mutex_lock(&entity->graph_obj.mdev->graph_mutex);
 
 	/* Apply use count to node. */
 	entity->use_count += change;
@@ -505,7 +505,7 @@ int omap4iss_pipeline_pm_use(struct media_entity *entity, int use)
 	if (ret < 0)
 		entity->use_count -= change;
 
-	mutex_unlock(&entity->parent->graph_mutex);
+	mutex_unlock(&entity->graph_obj.mdev->graph_mutex);
 
 	return ret;
 }
diff --git a/drivers/staging/media/omap4iss/iss_video.c b/drivers/staging/media/omap4iss/iss_video.c
index 25e9e7a6b99d..45a3f2d778fc 100644
--- a/drivers/staging/media/omap4iss/iss_video.c
+++ b/drivers/staging/media/omap4iss/iss_video.c
@@ -207,7 +207,7 @@ iss_video_far_end(struct iss_video *video)
 {
 	struct media_entity_graph graph;
 	struct media_entity *entity = &video->video.entity;
-	struct media_device *mdev = entity->parent;
+	struct media_device *mdev = entity->graph_obj.mdev;
 	struct iss_video *far_end = NULL;
 
 	mutex_lock(&mdev->graph_mutex);
-- 
2.4.3

Re: [PATCH 3/4] [media] media: use entity.graph_obj.mdev instead of .parent

[Hans Verkuil]

On 08/19/15 17:35, Javier Martinez Canillas wrote:
> The struct media_entity has a .parent field that stores a pointer
> to the parent struct media_device. But recently a media_gobj was
> embedded into the entities and since struct media_gojb already has
> a pointer to a struct media_device in the .mdev field, the .parent
> field becomes redundant and can be removed.
> 
> This patch replaces all the usage of .parent by .graph_obj.mdev so
> that field will become unused and can be removed on a later patch.
> 
> No functional changes.
> 
> The transformation was made using the following coccinelle spatch:
> 
> @@
> struct media_entity *me;
> @@
> 
> - me->parent
> + me->graph_obj.mdev
> 
> @@
> struct media_entity *link;
> @@
> 
> - link->source->entity->parent
> + link->source->entity->graph_obj.mdev
> 
> @@
> struct exynos_video_entity *ve;
> @@
> 
> - ve->vdev.entity.parent
> + ve->vdev.entity.graph_obj.mdev
> 
> Suggested-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>

Regards,

	Hans

[PATCH 4/4] [media] media: remove media entity .parent field

[Javier Martinez Canillas]

Now that the struct media_entity .parent field is unused, it can be
safely removed. Since all the previous users were converted to use
the .mdev field from the embedded struct media_gobj instead.

Suggested-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>

---

 include/media/media-entity.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/include/media/media-entity.h b/include/media/media-entity.h
index 3b653e9321f2..d7e007f624a5 100644
--- a/include/media/media-entity.h
+++ b/include/media/media-entity.h
@@ -103,7 +103,6 @@ struct media_entity_operations {
 struct media_entity {
 	struct media_gobj graph_obj;
 	struct list_head list;
-	struct media_device *parent;	/* Media device this entity belongs to*/
 	const char *name;		/* Entity name */
 	u32 type;			/* Entity type (MEDIA_ENT_T_*) */
 	u32 revision;			/* Entity revision, driver specific */
-- 
2.4.3

Re: [PATCH 4/4] [media] media: remove media entity .parent field

[Hans Verkuil]

On 08/19/15 17:35, Javier Martinez Canillas wrote:
> Now that the struct media_entity .parent field is unused, it can be
> safely removed. Since all the previous users were converted to use
> the .mdev field from the embedded struct media_gobj instead.
> 
> Suggested-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>

> 
> ---
> 
>  include/media/media-entity.h | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/include/media/media-entity.h b/include/media/media-entity.h
> index 3b653e9321f2..d7e007f624a5 100644
> --- a/include/media/media-entity.h
> +++ b/include/media/media-entity.h
> @@ -103,7 +103,6 @@ struct media_entity_operations {
>  struct media_entity {
>  	struct media_gobj graph_obj;
>  	struct list_head list;
> -	struct media_device *parent;	/* Media device this entity belongs to*/
>  	const char *name;		/* Entity name */
>  	u32 type;			/* Entity type (MEDIA_ENT_T_*) */
>  	u32 revision;			/* Entity revision, driver specific */
> 

Re: [PATCH 0/4] [media] Media entity cleanups and build fixes

[Mauro Carvalho Chehab]

Hi Javier,

Em Wed, 19 Aug 2015 17:35:18 +0200
Javier Martinez Canillas <javier@osg.samsung.com> escreveu:

> Hello,
> 
> This series contains a couple of build fixes and cleanups for the
> Media Controller framework. The goal of the series is to get rid of
> the struct media_entity .parent member since now that a media_gobj is
> embedded into entities, the media_gobj .mdev member can be used to
> store a pointer to the parent struct media_device.
> 
> So the .parent field becomes redundant and can be removed after all
> the users are converted to use entity .graph_obj.mdev instead.
> 
> Patches 1/4 and 2/4 are build fixes I found while build testing if no
> regressions were introduced by the conversion. 

Crap. Those omap drivers depend on some sub-arch specific DMA functions,
and can't use COMPILE_TEST. I hope some day someone would fix it,
in order to avoid troubles like that.

> Patch 3/4 converts
> all the drivers and the MC core to use .mdev instead of .parent and
> finally patch 4/4 removes the .parent field since now is unused.

Thanks for that!
All patches look good on my eyes.
> 
> The series depend on Mauro's "[PATCH v6 0/8] MC preparation patches
> series" [0].

I'll add those patches on my experimental branch together with the
other patches that belong to the MC next gen rework.

> 
> The transformation were automated using a coccinelle semantic patch
> and the drivers were build tested using allyesconfig and x-building
> the ARM Exynos and OMAP defconfigs + the needed media config options.
> 
> Best regards,
> Javier
> 
> [0]: http://www.mail-archive.com/linux-media@vger.kernel.org/msg91330.html
> 
> 
> Javier Martinez Canillas (4):
>   [media] staging: omap4iss: get entity ID using media_entity_id()
>   [media] omap3isp: get entity ID using media_entity_id()
>   [media] media: use entity.graph_obj.mdev instead of .parent
>   [media] media: remove media entity .parent field
> 
>  drivers/media/media-device.c                       |  8 ++---
>  drivers/media/media-entity.c                       | 34 ++++++++++++----------
>  drivers/media/platform/exynos4-is/fimc-isp-video.c |  6 ++--
>  drivers/media/platform/exynos4-is/fimc-lite.c      |  8 ++---
>  drivers/media/platform/exynos4-is/media-dev.c      |  2 +-
>  drivers/media/platform/exynos4-is/media-dev.h      |  8 ++---
>  drivers/media/platform/omap3isp/isp.c              | 11 ++++---
>  drivers/media/platform/omap3isp/ispccdc.c          |  2 +-
>  drivers/media/platform/omap3isp/ispvideo.c         | 10 ++++---
>  drivers/media/platform/vsp1/vsp1_video.c           |  2 +-
>  drivers/media/platform/xilinx/xilinx-dma.c         |  2 +-
>  drivers/staging/media/davinci_vpfe/vpfe_video.c    |  6 ++--
>  drivers/staging/media/omap4iss/iss.c               |  6 ++--
>  drivers/staging/media/omap4iss/iss_video.c         |  4 +--
>  include/media/media-entity.h                       |  1 -
>  15 files changed, 58 insertions(+), 52 deletions(-)
> 

Thanks and regards,
Mauro

Re: [PATCH 0/4] [media] Media entity cleanups and build fixes

[Hans Verkuil]

On 08/19/15 17:35, Javier Martinez Canillas wrote:
> Hello,
> 
> This series contains a couple of build fixes and cleanups for the
> Media Controller framework. The goal of the series is to get rid of
> the struct media_entity .parent member since now that a media_gobj is
> embedded into entities, the media_gobj .mdev member can be used to
> store a pointer to the parent struct media_device.
> 
> So the .parent field becomes redundant and can be removed after all
> the users are converted to use entity .graph_obj.mdev instead.
> 
> Patches 1/4 and 2/4 are build fixes I found while build testing if no
> regressions were introduced by the conversion. Patch 3/4 converts
> all the drivers and the MC core to use .mdev instead of .parent and
> finally patch 4/4 removes the .parent field since now is unused.

Regarding patches 1 and 2: these should of course be merged with Mauro's
patches that make this particular change (patch 3/8), otherwise it would
break git bisect.

Anyway,

Acked-by: Hans Verkuil <hans.verkuil@cisco.com> for the changes in patch
1 and 2, as long as they are added to Mauro's patch 3/8.

Regards,

	Hans

> 
> The series depend on Mauro's "[PATCH v6 0/8] MC preparation patches
> series" [0].
> 
> The transformation were automated using a coccinelle semantic patch
> and the drivers were build tested using allyesconfig and x-building
> the ARM Exynos and OMAP defconfigs + the needed media config options.
> 
> Best regards,
> Javier
> 
> [0]: http://www.mail-archive.com/linux-media@vger.kernel.org/msg91330.html
> 
> 
> Javier Martinez Canillas (4):
>   [media] staging: omap4iss: get entity ID using media_entity_id()
>   [media] omap3isp: get entity ID using media_entity_id()
>   [media] media: use entity.graph_obj.mdev instead of .parent
>   [media] media: remove media entity .parent field
> 
>  drivers/media/media-device.c                       |  8 ++---
>  drivers/media/media-entity.c                       | 34 ++++++++++++----------
>  drivers/media/platform/exynos4-is/fimc-isp-video.c |  6 ++--
>  drivers/media/platform/exynos4-is/fimc-lite.c      |  8 ++---
>  drivers/media/platform/exynos4-is/media-dev.c      |  2 +-
>  drivers/media/platform/exynos4-is/media-dev.h      |  8 ++---
>  drivers/media/platform/omap3isp/isp.c              | 11 ++++---
>  drivers/media/platform/omap3isp/ispccdc.c          |  2 +-
>  drivers/media/platform/omap3isp/ispvideo.c         | 10 ++++---
>  drivers/media/platform/vsp1/vsp1_video.c           |  2 +-
>  drivers/media/platform/xilinx/xilinx-dma.c         |  2 +-
>  drivers/staging/media/davinci_vpfe/vpfe_video.c    |  6 ++--
>  drivers/staging/media/omap4iss/iss.c               |  6 ++--
>  drivers/staging/media/omap4iss/iss_video.c         |  4 +--
>  include/media/media-entity.h                       |  1 -
>  15 files changed, 58 insertions(+), 52 deletions(-)
> 

Re: [PATCH 0/4] [media] Media entity cleanups and build fixes

[Javier Martinez Canillas]

Hello Hans,

On 08/20/2015 02:41 PM, Hans Verkuil wrote:
> On 08/19/15 17:35, Javier Martinez Canillas wrote:
>> Hello,
>>
>> This series contains a couple of build fixes and cleanups for the
>> Media Controller framework. The goal of the series is to get rid of
>> the struct media_entity .parent member since now that a media_gobj is
>> embedded into entities, the media_gobj .mdev member can be used to
>> store a pointer to the parent struct media_device.
>>
>> So the .parent field becomes redundant and can be removed after all
>> the users are converted to use entity .graph_obj.mdev instead.
>>
>> Patches 1/4 and 2/4 are build fixes I found while build testing if no
>> regressions were introduced by the conversion. Patch 3/4 converts
>> all the drivers and the MC core to use .mdev instead of .parent and
>> finally patch 4/4 removes the .parent field since now is unused.
> 
> Regarding patches 1 and 2: these should of course be merged with Mauro's
> patches that make this particular change (patch 3/8), otherwise it would
> break git bisect.
> 
> Anyway,
> 
> Acked-by: Hans Verkuil <hans.verkuil@cisco.com> for the changes in patch

Thanks a lot for the acks.

> 1 and 2, as long as they are added to Mauro's patch 3/8.
>

Indeed, I completely agree that these should be squashed with
Mauro's patch to maintain git bisect-ability.
 
> Regards,
> 
> 	Hans
> 

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America