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 | 26 ++++++++++++++++++++++++++
include/media/media-request.h | 25 +++++++++++++++++++++++++
2 files changed, 51 insertions(+)
diff --git a/drivers/media/media-request.c b/drivers/media/media-request.c
index 02b620c81de5..415f7e31019d 100644
--- a/drivers/media/media-request.c
+++ b/drivers/media/media-request.c
@@ -322,6 +322,32 @@ 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 (!ops && !priv)
+ return NULL;
+
+ spin_lock_irqsave(&req->lock, flags);
+ list_for_each_entry(obj, &req->objects, list) {
+ if ((!ops || obj->ops == ops) &&
+ (!priv || 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 033697d493cd..ea990c8f76bc 100644
--- a/include/media/media-request.h
+++ b/include/media/media-request.h
@@ -130,6 +130,23 @@ 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, may be NULL.
+ * @priv: Find an object with this priv value, may be NULL.
+ *
+ * At least one of @ops and @priv must be non-NULL. If one of
+ * these is NULL, then skip checking for that field.
+ *
+ * Returns NULL if not found or the object (the refcount is increased
+ * in that case).
+ */
+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
*
@@ -162,6 +179,14 @@ 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;
--
2.16.3
