[RFCv2 07/17] v4l2-ctrls: prepare internal structs for request API

[Alexandre Courbot]

From: Hans Verkuil <hans.verk...@cisco.com>

Add a refcount and is_request bool to struct v4l2_ctrl_handler:
this is used to refcount a handler that represents a request.

Add a p_req field to struct v4l2_ctrl_ref that will store the
request value.

Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
Signed-off-by: Alexandre Courbot <acour...@chromium.org>
---
 drivers/media/v4l2-core/v4l2-ctrls.c | 1 +
 include/media/v4l2-ctrls.h           | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c 
b/drivers/media/v4l2-core/v4l2-ctrls.c
index 54444e3b8883..9d99679b543c 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -1751,6 +1751,7 @@ int v4l2_ctrl_handler_init_class(struct v4l2_ctrl_handler 
*hdl,
                                      sizeof(hdl->buckets[0]),
                                      GFP_KERNEL | __GFP_ZERO);
        hdl->error = hdl->buckets ? 0 : -ENOMEM;
+       hdl->is_request = false;
        return hdl->error;
 }
 EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index a762f3392d90..a215f25a82cf 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -18,6 +18,7 @@
 #define _V4L2_CTRLS_H
 
 #include <linux/list.h>
+#include <linux/kref.h>
 #include <linux/mutex.h>
 #include <linux/videodev2.h>
 
@@ -250,6 +251,7 @@ struct v4l2_ctrl_ref {
        struct v4l2_ctrl_ref *next;
        struct v4l2_ctrl *ctrl;
        struct v4l2_ctrl_helper *helper;
+       union v4l2_ctrl_ptr p_req;
        bool from_other_dev;
 };
 
@@ -285,7 +287,9 @@ struct v4l2_ctrl_handler {
        v4l2_ctrl_notify_fnc notify;
        void *notify_priv;
        u16 nr_of_buckets;
+       bool is_request;
        int error;
+       struct kref ref;
 };
 
 /**
-- 
2.16.0.rc1.238.g530d649a79-goog