On 12/13/18 6:14 PM, Mauro Carvalho Chehab wrote:
> Em Thu, 13 Dec 2018 14:41:11 +0100
> hverkuil-cisco@xxxxxxxxx escreveu:
>
>> From: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
>>
>> Add support for properties. In this initial implementation properties
>> can be added to entities and pads. In addition, properties can be
>> nested.
>>
>> Most of the changes are straightforward, but I had to make some changes
>> to the way entities are initialized, since the struct has to be
>> initialized either when media_entity_pads_init() is called or when
>> media_device_register_entity() is called, whichever comes first.
>>
>> The properties list in the entity has to be initialized in both cases,
>> otherwise you can't add properties to it.
>>
>> The entity struct is now initialized in media_entity_init and called
>> from both functions if ent->inited is 0.
>>
>> Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
>> ---
>> drivers/media/media-device.c | 129 ++++++++++++++++++++++++++++++++---
>> drivers/media/media-entity.c | 26 +++++--
>> include/media/media-device.h | 6 ++
>> include/media/media-entity.h | 58 ++++++++++++++++
>> 4 files changed, 205 insertions(+), 14 deletions(-)
>>
>> diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
>> index bed24372e61f..a932e6848d47 100644
>> --- a/drivers/media/media-device.c
>> +++ b/drivers/media/media-device.c
>> @@ -242,10 +242,14 @@ static long media_device_get_topology(struct media_device *mdev, void *arg)
>> struct media_interface *intf;
>> struct media_pad *pad;
>> struct media_link *link;
>> + struct media_prop *prop;
>> struct media_v2_entity kentity, __user *uentity;
>> struct media_v2_interface kintf, __user *uintf;
>> struct media_v2_pad kpad, __user *upad;
>> struct media_v2_link klink, __user *ulink;
>> + struct media_v2_prop kprop, __user *uprop;
>> + unsigned int props_payload_size = 0;
>> + unsigned int prop_payload_offset;
>> unsigned int i;
>> int ret = 0;
>>
>> @@ -375,6 +379,48 @@ static long media_device_get_topology(struct media_device *mdev, void *arg)
>> topo->num_links = i;
>> topo->reserved4 = 0;
>>
>> + /* Get properties and number of properties */
>> + i = 0;
>> + uprop = media_get_uptr(topo->ptr_props);
>> + media_device_for_each_prop(prop, mdev) {
>> + i++;
>> + props_payload_size += ALIGN(prop->payload_size, sizeof(u64));
>
> I wouldn't be aligning it to u64. Instead, I would use something like:
>
> ALIGN(prop->payload_size, sizeof(void *))
>
> This way, it would waste less space on 32-bits CPU.
OK.
>
>> + }
>> + if (i > topo->num_props ||
>> + props_payload_size > topo->props_payload_size)
>> + ret = ret ? : -ENOSPC;
>> + topo->props_payload_size = props_payload_size;
>> + topo->num_props = i;
>> + topo->reserved4 = 0;
>> +
>> + if (ret || !uprop)
>> + return ret;
>> +
>> + prop_payload_offset = topo->num_props * sizeof(*uprop);
>> + media_device_for_each_prop(prop, mdev) {
>> + memset(&kprop, 0, sizeof(kprop));
>> +
>> + /* Copy prop fields to userspace struct */
>> + kprop.id = prop->graph_obj.id;
>> + kprop.type = prop->type;
>> + kprop.owner_id = prop->owner->id;
>> + kprop.owner_type = media_type(prop->owner);
>> + kprop.payload_size = prop->payload_size;
>> + if (prop->payload_size) {
>> + kprop.payload_offset = prop_payload_offset;
>> + if (copy_to_user((u8 __user *)uprop + prop_payload_offset,
>> + prop->payload, prop->payload_size))
>> + return -EFAULT;
>> + prop_payload_offset += ALIGN(prop->payload_size, sizeof(u64));
>> + }
>> + memcpy(kprop.name, prop->name, sizeof(kprop.name));
>> +
>> + if (copy_to_user(uprop, &kprop, sizeof(kprop)))
>> + return -EFAULT;
>> + uprop++;
>> + prop_payload_offset -= sizeof(*uprop);
>> + }
>> +
>> return ret;
>> }
>>
>> @@ -408,9 +454,10 @@ static long copy_arg_to_user(void __user *uarg, void *karg, unsigned int cmd)
>> /* Do acquire the graph mutex */
>> #define MEDIA_IOC_FL_GRAPH_MUTEX BIT(0)
>>
>> -#define MEDIA_IOC_ARG(__cmd, func, fl, from_user, to_user) \
>> +#define MEDIA_IOC_ARG(__cmd, alts, func, fl, from_user, to_user) \
>> [_IOC_NR(MEDIA_IOC_##__cmd)] = { \
>> .cmd = MEDIA_IOC_##__cmd, \
>> + .alternatives = (alts), \
>> .fn = (long (*)(struct media_device *, void *))func, \
>> .flags = fl, \
>> .arg_from_user = from_user, \
>> @@ -418,23 +465,39 @@ static long copy_arg_to_user(void __user *uarg, void *karg, unsigned int cmd)
>> }
>>
>> #define MEDIA_IOC(__cmd, func, fl) \
>> - MEDIA_IOC_ARG(__cmd, func, fl, copy_arg_from_user, copy_arg_to_user)
>> + MEDIA_IOC_ARG(__cmd, NULL, func, fl, copy_arg_from_user, copy_arg_to_user)
>> +#define MEDIA_IOC_ALTS(__cmd, alts, func, fl) \
>> + MEDIA_IOC_ARG(__cmd, alts, func, fl, copy_arg_from_user, copy_arg_to_user)
>>
>> /* the table is indexed by _IOC_NR(cmd) */
>> struct media_ioctl_info {
>> unsigned int cmd;
>> + const unsigned int *alternatives;
>> unsigned short flags;
>> long (*fn)(struct media_device *dev, void *arg);
>> long (*arg_from_user)(void *karg, void __user *uarg, unsigned int cmd);
>> long (*arg_to_user)(void __user *uarg, void *karg, unsigned int cmd);
>> };
>>
>> +#define _IOWR_COMPAT(type, nr, size) \
>> + _IOC(_IOC_READ | _IOC_WRITE, (type), (nr), (size))
>> +
>> +/* Old MEDIA_IOC_G_TOPOLOGY ioctl without props support */
>> +#define MEDIA_IOC_G_TOPOLOGY_V1 _IOWR_COMPAT('|', 0x04, offsetof(struct media_v2_topology, num_props))
>> +
>> +static const unsigned int topo_alts[] = {
>> + /* Old MEDIA_IOC_G_TOPOLOGY without props support */
>> + MEDIA_IOC_G_TOPOLOGY_V1,
>> + 0
>> +};
>> +
>> static const struct media_ioctl_info ioctl_info[] = {
>> MEDIA_IOC(DEVICE_INFO, media_device_get_info, MEDIA_IOC_FL_GRAPH_MUTEX),
>> MEDIA_IOC(ENUM_ENTITIES, media_device_enum_entities, MEDIA_IOC_FL_GRAPH_MUTEX),
>> MEDIA_IOC(ENUM_LINKS, media_device_enum_links, MEDIA_IOC_FL_GRAPH_MUTEX),
>> MEDIA_IOC(SETUP_LINK, media_device_setup_link, MEDIA_IOC_FL_GRAPH_MUTEX),
>> MEDIA_IOC(G_TOPOLOGY, media_device_get_topology, MEDIA_IOC_FL_GRAPH_MUTEX),
>> + MEDIA_IOC_ALTS(G_TOPOLOGY, topo_alts, media_device_get_topology, MEDIA_IOC_FL_GRAPH_MUTEX),
>> MEDIA_IOC(REQUEST_ALLOC, media_device_request_alloc, 0),
>> };
>>
>> @@ -448,17 +511,29 @@ static long media_device_ioctl(struct file *filp, unsigned int cmd,
>> char __karg[256], *karg = __karg;
>> long ret;
>>
>> - if (_IOC_NR(cmd) >= ARRAY_SIZE(ioctl_info)
>> - || ioctl_info[_IOC_NR(cmd)].cmd != cmd)
>> + if (_IOC_NR(cmd) >= ARRAY_SIZE(ioctl_info))
>> return -ENOIOCTLCMD;
>>
>> info = &ioctl_info[_IOC_NR(cmd)];
>>
>> + if (info->cmd != cmd) {
>> + const unsigned int *p;
>> +
>> + for (p = info->alternatives; p && *p; p++)
>> + if (*p == cmd)
>> + break;
>> + if (!p || !*p)
>> + return -ENOIOCTLCMD;
>> + }
>> +
>> if (_IOC_SIZE(info->cmd) > sizeof(__karg)) {
>> karg = kmalloc(_IOC_SIZE(info->cmd), GFP_KERNEL);
>> if (!karg)
>> return -ENOMEM;
>> }
>> + if (_IOC_SIZE(info->cmd) > _IOC_SIZE(cmd))
>> + memset(karg + _IOC_SIZE(cmd), 0,
>> + _IOC_SIZE(info->cmd) - _IOC_SIZE(cmd));
>>
>> if (info->arg_from_user) {
>> ret = info->arg_from_user(karg, arg, cmd);
>> @@ -571,6 +646,16 @@ static void media_device_release(struct media_devnode *devnode)
>> dev_dbg(devnode->parent, "Media device released\n");
>> }
>>
>> +static void init_prop_list(struct media_device *mdev, struct list_head *list)
>> +{
>> + struct media_prop *prop;
>> +
>> + list_for_each_entry(prop, list, list) {
>> + media_gobj_create(mdev, MEDIA_GRAPH_PROP, &prop->graph_obj);
>> + init_prop_list(mdev, &prop->props);
>> + }
>> +}
>> +
>> /**
>> * media_device_register_entity - Register an entity with a media device
>> * @mdev: The media device
>> @@ -592,9 +677,8 @@ int __must_check media_device_register_entity(struct media_device *mdev,
>> /* Warn if we apparently re-register an entity */
>> WARN_ON(entity->graph_obj.mdev != NULL);
>
> It seems that you missed my comments on this hunk (or maybe I missed your
> answer to my review of patch 2/3 of RFCv4[1]).
Ah yes, I forgot that. I was a bit in a hurry to prepare a v5 since this is the last one
before my vacation.
>
> [1] https://lore.kernel.org/linux-media/20181212070225.2863a72e@xxxxxxxx/
>
> I'll repeat it here:
>
> For this:
>
> > /* Warn if we apparently re-register an entity */
> > WARN_ON(entity->graph_obj.mdev != NULL);
>
> Side note: it would probably make sense to change the above to:
>
> if (WARN_ON(entity->graph_obj.mdev != NULL))
> return -EINVAL;
>
> That should be on a separate patch, as it is unrelated to the
> properties API addition.
>
>> entity->graph_obj.mdev = mdev;
>> - INIT_LIST_HEAD(&entity->links);
>> - entity->num_links = 0;
>> - entity->num_backlinks = 0;
>> + if (!entity->inited)
>> + media_entity_init(entity);
>
> Nitpick: I would add a comment for this explaining why the check is
> required here.
Good point.
>
>>
>> ret = ida_alloc_min(&mdev->entity_internal_idx, 1, GFP_KERNEL);
>> if (ret < 0)
>> @@ -608,10 +692,17 @@ int __must_check media_device_register_entity(struct media_device *mdev,
>> /* Initialize media_gobj embedded at the entity */
>> media_gobj_create(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
>>
>> + /* Initialize objects at the props */
>> + init_prop_list(mdev, &entity->props);
>> +
>> /* Initialize objects at the pads */
>> - for (i = 0; i < entity->num_pads; i++)
>> + for (i = 0; i < entity->num_pads; i++) {
>> media_gobj_create(mdev, MEDIA_GRAPH_PAD,
>> - &entity->pads[i].graph_obj);
>> + &entity->pads[i].graph_obj);
>> +
>> + /* Initialize objects at the pad props */
>> + init_prop_list(mdev, &entity->pads[i].props);
>> + }
>>
>> /* invoke entity_notify callbacks */
>> list_for_each_entry_safe(notify, next, &mdev->entity_notify, list)
>> @@ -640,6 +731,18 @@ int __must_check media_device_register_entity(struct media_device *mdev,
>> }
>> EXPORT_SYMBOL_GPL(media_device_register_entity);
>>
>> +static void media_device_free_props(struct list_head *list)
>> +{
>> + while (!list_empty(list)) {
>> + struct media_prop *prop;
>> +
>> + prop = list_first_entry(list, struct media_prop, list);
>> + list_del(&prop->list);
>> + media_gobj_destroy(&prop->graph_obj);
>> + kfree(prop);
>> + }
>> +}
>> +
>> static void __media_device_unregister_entity(struct media_entity *entity)
>> {
>> struct media_device *mdev = entity->graph_obj.mdev;
>> @@ -661,8 +764,13 @@ static void __media_device_unregister_entity(struct media_entity *entity)
>> __media_entity_remove_links(entity);
>>
>> /* Remove all pads that belong to this entity */
>> - for (i = 0; i < entity->num_pads; i++)
>> + for (i = 0; i < entity->num_pads; i++) {
>> + media_device_free_props(&entity->pads[i].props);
>> media_gobj_destroy(&entity->pads[i].graph_obj);
>> + }
>> +
>> + /* Remove all props that belong to this entity */
>> + media_device_free_props(&entity->props);
>>
>> /* Remove the entity */
>> media_gobj_destroy(&entity->graph_obj);
>> @@ -701,6 +809,7 @@ void media_device_init(struct media_device *mdev)
>> INIT_LIST_HEAD(&mdev->interfaces);
>> INIT_LIST_HEAD(&mdev->pads);
>> INIT_LIST_HEAD(&mdev->links);
>> + INIT_LIST_HEAD(&mdev->props);
>> INIT_LIST_HEAD(&mdev->entity_notify);
>>
>> mutex_init(&mdev->req_queue_mutex);
>> diff --git a/drivers/media/media-entity.c b/drivers/media/media-entity.c
>> index 0b1cb3559140..62c4d5b4d33f 100644
>> --- a/drivers/media/media-entity.c
>> +++ b/drivers/media/media-entity.c
>> @@ -34,6 +34,8 @@ static inline const char *gobj_type(enum media_gobj_type type)
>> return "link";
>> case MEDIA_GRAPH_INTF_DEVNODE:
>> return "intf-devnode";
>> + case MEDIA_GRAPH_PROP:
>> + return "prop";
>> default:
>> return "unknown";
>> }
>
>
>
>> @@ -106,7 +108,7 @@ static void dev_dbg_obj(const char *event_name, struct media_gobj *gobj)
>> switch (media_type(gobj)) {
>> case MEDIA_GRAPH_ENTITY:
>> dev_dbg(gobj->mdev->dev,
>> - "%s id %u: entity '%s'\n",
>> + "%s id 0x%08x: entity '%s'\n",
>> event_name, media_id(gobj),
>> gobj_to_entity(gobj)->name);
>> break;
>> @@ -115,7 +117,7 @@ static void dev_dbg_obj(const char *event_name, struct media_gobj *gobj)
>> struct media_link *link = gobj_to_link(gobj);
>>
>> dev_dbg(gobj->mdev->dev,
>> - "%s id %u: %s link id %u ==> id %u\n",
>> + "%s id 0x%08x: %s link id 0x%08x ==> id 0x%08x\n",
>> event_name, media_id(gobj),
>> media_type(link->gobj0) == MEDIA_GRAPH_PAD ?
>> "data" : "interface",
>> @@ -128,7 +130,7 @@ static void dev_dbg_obj(const char *event_name, struct media_gobj *gobj)
>> struct media_pad *pad = gobj_to_pad(gobj);
>>
>> dev_dbg(gobj->mdev->dev,
>> - "%s id %u: %s%spad '%s':%d\n",
>> + "%s id 0x%08x: %s%spad '%s':%d\n",
>> event_name, media_id(gobj),
>> pad->flags & MEDIA_PAD_FL_SINK ? "sink " : "",
>> pad->flags & MEDIA_PAD_FL_SOURCE ? "source " : "",
>> @@ -141,12 +143,22 @@ static void dev_dbg_obj(const char *event_name, struct media_gobj *gobj)
>> struct media_intf_devnode *devnode = intf_to_devnode(intf);
>>
>> dev_dbg(gobj->mdev->dev,
>> - "%s id %u: intf_devnode %s - major: %d, minor: %d\n",
>> + "%s id 0x%08x: intf_devnode %s - major: %d, minor: %d\n",
>> event_name, media_id(gobj),
>> intf_type(intf),
>> devnode->major, devnode->minor);
>> break;
>> }
>
> I also suggested to move the above hunks to a separate patch, as this change
> is not really related to the addition of the properties.
Missed that too, sorry.
>
>> + case MEDIA_GRAPH_PROP:
>> + {
>> + struct media_prop *prop = gobj_to_prop(gobj);
>> +
>> + dev_dbg(gobj->mdev->dev,
>> + "%s id 0x%08x: prop '%s':0x%08x\n",
>> + event_name, media_id(gobj),
>> + prop->name, media_id(prop->owner));
>> + break;
>> + }
>> }
>> #endif
>> }
>> @@ -175,6 +187,9 @@ void media_gobj_create(struct media_device *mdev,
>> case MEDIA_GRAPH_INTF_DEVNODE:
>> list_add_tail(&gobj->list, &mdev->interfaces);
>> break;
>> + case MEDIA_GRAPH_PROP:
>> + list_add_tail(&gobj->list, &mdev->props);
>> + break;
>> }
>>
>> mdev->topology_version++;
>> @@ -212,6 +227,8 @@ int media_entity_pads_init(struct media_entity *entity, u16 num_pads,
>> if (num_pads >= MEDIA_ENTITY_MAX_PADS)
>> return -E2BIG;
>>
>> + if (!entity->inited)
>> + media_entity_init(entity);
>> entity->num_pads = num_pads;
>> entity->pads = pads;
>>
>> @@ -221,6 +238,7 @@ int media_entity_pads_init(struct media_entity *entity, u16 num_pads,
>> for (i = 0; i < num_pads; i++) {
>> pads[i].entity = entity;
>> pads[i].index = i;
>> + INIT_LIST_HEAD(&pads[i].props);
>> if (mdev)
>> media_gobj_create(mdev, MEDIA_GRAPH_PAD,
>> &entity->pads[i].graph_obj);
>> diff --git a/include/media/media-device.h b/include/media/media-device.h
>> index c8ddbfe8b74c..d422a1e1c367 100644
>> --- a/include/media/media-device.h
>> +++ b/include/media/media-device.h
>> @@ -101,6 +101,7 @@ struct media_device_ops {
>> * @interfaces: List of registered interfaces
>> * @pads: List of registered pads
>> * @links: List of registered links
>> + * @props: List of registered properties
>> * @entity_notify: List of registered entity_notify callbacks
>> * @graph_mutex: Protects access to struct media_device data
>> * @pm_count_walk: Graph walk for power state walk. Access serialised using
>> @@ -170,6 +171,7 @@ struct media_device {
>> struct list_head interfaces;
>> struct list_head pads;
>> struct list_head links;
>> + struct list_head props;
>>
>> /* notify callback list invoked when a new entity is registered */
>> struct list_head entity_notify;
>> @@ -411,6 +413,10 @@ void media_device_unregister_entity_notify(struct media_device *mdev,
>> #define media_device_for_each_link(link, mdev) \
>> list_for_each_entry(link, &(mdev)->links, graph_obj.list)
>>
>> +/* Iterate over all props. */
>> +#define media_device_for_each_prop(prop, mdev) \
>> + list_for_each_entry(prop, &(mdev)->props, graph_obj.list)
>> +
>> /**
>> * media_device_pci_init() - create and initialize a
>> * struct &media_device from a PCI device.
>> diff --git a/include/media/media-entity.h b/include/media/media-entity.h
>> index e5f6960d92f6..5d05ebf712d0 100644
>> --- a/include/media/media-entity.h
>> +++ b/include/media/media-entity.h
>> @@ -21,6 +21,7 @@
>>
>> #include <linux/bitmap.h>
>> #include <linux/bug.h>
>> +#include <linux/err.h>
>> #include <linux/fwnode.h>
>> #include <linux/kernel.h>
>> #include <linux/list.h>
>> @@ -36,12 +37,14 @@
>> * @MEDIA_GRAPH_LINK: Identify a media link
>> * @MEDIA_GRAPH_INTF_DEVNODE: Identify a media Kernel API interface via
>> * a device node
>> + * @MEDIA_GRAPH_PROP: Identify a media property
>> */
>> enum media_gobj_type {
>> MEDIA_GRAPH_ENTITY,
>> MEDIA_GRAPH_PAD,
>> MEDIA_GRAPH_LINK,
>> MEDIA_GRAPH_INTF_DEVNODE,
>> + MEDIA_GRAPH_PROP,
>> };
>>
>> #define MEDIA_BITS_PER_TYPE 8
>> @@ -193,6 +196,7 @@ enum media_pad_signal_type {
>> * @flags: Pad flags, as defined in
>> * :ref:`include/uapi/linux/media.h <media_header>`
>> * (seek for ``MEDIA_PAD_FL_*``)
>> + * @props: The list pad properties
>> */
>> struct media_pad {
>> struct media_gobj graph_obj; /* must be first field in struct */
>> @@ -200,6 +204,33 @@ struct media_pad {
>> u16 index;
>> enum media_pad_signal_type sig_type;
>> unsigned long flags;
>> + struct list_head props;
>> +};
>> +
>> +/**
>> + * struct media_prop - A media property graph object.
>> + *
>> + * @graph_obj: Embedded structure containing the media object common data
>> + * @list: Linked list associated with the object that owns the link.
>> + * @owner: Graph object this property belongs to
>> + * @index: Property index for the owner property array, numbered
>> + * from 0 to n
>> + * @type: Property type
>> + * @payload_size: Property payload size (i.e. additional bytes beyond this
>> + * struct)
>> + * @props: The list of sub-properties
>> + * @name: Property name
>> + * @payload: Property payload starts here
>> + */
>> +struct media_prop {
>> + struct media_gobj graph_obj; /* must be first field in struct */
>> + struct list_head list;
>> + struct media_gobj *owner;
>
> OK.
>
> Despite my comment at uAPI about the N:1 case of removing the owner
> there, here, I would keep it.
>
> For the first version of properties API, we should stick with 1:1 map.
>
> We can later expand for N:1 if needed - and if we don't export owner_id
> at uAPI inside the properties structure.
I don't understand this remark. The owner_id of a property needs to be exported,
how else would the application know to which object the property belongs?
>
>> + u32 type;
>> + u32 payload_size;
>> + struct list_head props;
>> + char name[32];
>> + u8 payload[];
>> };
>>
>> /**
>> @@ -266,6 +297,7 @@ enum media_entity_type {
>> * @flags: Entity flags, as defined in
>> * :ref:`include/uapi/linux/media.h <media_header>`
>> * (seek for ``MEDIA_ENT_FL_*``)
>> + * @inited: Non-zero if this struct was initialized.
>> * @num_pads: Number of sink and source pads.
>> * @num_links: Total number of links, forward and back, enabled and disabled.
>> * @num_backlinks: Number of backlinks
>> @@ -273,6 +305,7 @@ enum media_entity_type {
>> * re-used if entities are unregistered or registered again.
>> * @pads: Pads array with the size defined by @num_pads.
>> * @links: List of data links.
>> + * @props: List of entity properties.
>> * @ops: Entity operations.
>> * @stream_count: Stream count for the entity.
>> * @use_count: Use count for the entity.
>> @@ -300,6 +333,7 @@ struct media_entity {
>> enum media_entity_type obj_type;
>> u32 function;
>> unsigned long flags;
>> + unsigned int inited;
>>
>> u16 num_pads;
>> u16 num_links;
>> @@ -308,6 +342,7 @@ struct media_entity {
>>
>> struct media_pad *pads;
>> struct list_head links;
>> + struct list_head props;
>>
>> const struct media_entity_operations *ops;
>>
>> @@ -362,6 +397,20 @@ struct media_intf_devnode {
>> u32 minor;
>> };
>>
>> +/**
>> + * media_entity_init() - initialize the media entity struct
>> + *
>> + * @entity: pointer to &media_entity
>> + */
>> +static inline void media_entity_init(struct media_entity *entity)
>> +{
>> + INIT_LIST_HEAD(&entity->links);
>> + INIT_LIST_HEAD(&entity->props);
>> + entity->num_links = 0;
>> + entity->num_backlinks = 0;
>> + entity->inited = true;
>> +}
>> +
>
> As I said before, I would keep it together with the C file, as it makes
> easier to read (except, of course, if are there any reason why you
> would need to call it on a different C file).
It needs to be called from both media-entity.c and media-device.c.
But it might be better to just put it in media-entity.c as a regular function.
>
>> /**
>> * media_entity_id() - return the media entity graph object id
>> *
>> @@ -595,6 +644,15 @@ static inline bool media_entity_enum_intersects(
>> #define gobj_to_intf(gobj) \
>> container_of(gobj, struct media_interface, graph_obj)
>>
>> +/**
>> + * gobj_to_prop - returns the struct &media_prop pointer from the
>> + * @gobj contained on it.
>> + *
>> + * @gobj: Pointer to the struct &media_gobj graph object
>> + */
>> +#define gobj_to_prop(gobj) \
>> + container_of(gobj, struct media_prop, graph_obj)
>> +
>> /**
>> * intf_to_devnode - returns the struct media_intf_devnode pointer from the
>> * @intf contained on it.
>
>
>
> Thanks,
> Mauro
>
Regards,
Hans
