From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Add media_request_object_find to find a request object inside a
request based on ops and/or priv values.
Objects of the same type (vb2 buffer, control handler) will have
the same ops value. And objects that refer to the same 'parent'
object (e.g. the v4l2_ctrl_handler that has the current driver
state) will have the same priv value.
The caller has to call media_request_object_put() for the returned
object since this function increments the refcount.
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
drivers/media/media-request.c | 25 +++++++++++++++++++++++++
include/media/media-request.h | 24 ++++++++++++++++++++++++
2 files changed, 49 insertions(+)
diff --git a/drivers/media/media-request.c b/drivers/media/media-request.c
index edc1c3af1959c..c7e11e816e272 100644
--- a/drivers/media/media-request.c
+++ b/drivers/media/media-request.c
@@ -322,6 +322,31 @@ static void media_request_object_release(struct kref *kref)
obj->ops->release(obj);
}
+struct media_request_object *
+media_request_object_find(struct media_request *req,
+ const struct media_request_object_ops *ops,
+ void *priv)
+{
+ struct media_request_object *obj;
+ struct media_request_object *found = NULL;
+ unsigned long flags;
+
+ if (WARN_ON(!ops || !priv))
+ return NULL;
+
+ spin_lock_irqsave(&req->lock, flags);
+ list_for_each_entry(obj, &req->objects, list) {
+ if (obj->ops == ops && obj->priv == priv) {
+ media_request_object_get(obj);
+ found = obj;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&req->lock, flags);
+ return found;
+}
+EXPORT_SYMBOL_GPL(media_request_object_find);
+
void media_request_object_put(struct media_request_object *obj)
{
kref_put(&obj->kref, media_request_object_release);
diff --git a/include/media/media-request.h b/include/media/media-request.h
index 997e096d7128d..5367b4a2f91ca 100644
--- a/include/media/media-request.h
+++ b/include/media/media-request.h
@@ -197,6 +197,22 @@ static inline void media_request_object_get(struct media_request_object *obj)
void media_request_object_put(struct media_request_object *obj);
/**
+ * media_request_object_find - Find an object in a request
+ *
+ * @ops: Find an object with this ops value
+ * @priv: Find an object with this priv value
+ *
+ * Both @ops and @priv must be non-NULL.
+ *
+ * Returns NULL if not found or the object pointer. The caller must
+ * call media_request_object_put() once it finished using the object.
+ */
+struct media_request_object *
+media_request_object_find(struct media_request *req,
+ const struct media_request_object_ops *ops,
+ void *priv);
+
+/**
* media_request_object_init - Initialise a media request object
*
* Initialise a media request object. The object will be released using the
@@ -241,6 +257,14 @@ static inline void media_request_object_put(struct media_request_object *obj)
{
}
+static inline struct media_request_object *
+media_request_object_find(struct media_request *req,
+ const struct media_request_object_ops *ops,
+ void *priv)
+{
+ return NULL;
+}
+
static inline void media_request_object_init(struct media_request_object *obj)
{
obj->ops = NULL;
--
2.11.0
