[media] v4l: ctrls: Unlocked variants of v4l2_ctrl_s_ctrl{,_int64}()

Implement unlocked variants of v4l2_ctrl_s_ctrl() and
v4l2_ctrl_s_ctrl_int64(). As drivers need to set controls as they access
driver internal state elsewhere than in the control framework unlocked
variants of these functions become handy.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

2 files changed, 45 insertions, 8 deletions

diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 9cd978334b89..1acc7aa9d7e2 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -3175,27 +3175,41 @@ int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
 }
 EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
 
-int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
+int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
 {
 	struct v4l2_ext_control c;
+	int rval;
+
+	lockdep_assert_held(ctrl->handler->lock);
 
 	/* It's a driver bug if this happens. */
 	WARN_ON(!ctrl->is_int);
 	c.value = val;
-	return set_ctrl_lock(NULL, ctrl, &c);
+	rval = set_ctrl(NULL, ctrl, &c, 0);
+	if (!rval)
+		cur_to_user(&c, ctrl);
+
+	return rval;
 }
-EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
+EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl);
 
-int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
+int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
 {
 	struct v4l2_ext_control c;
+	int rval;
+
+	lockdep_assert_held(ctrl->handler->lock);
 
 	/* It's a driver bug if this happens. */
 	WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64);
 	c.value64 = val;
-	return set_ctrl_lock(NULL, ctrl, &c);
+	rval = set_ctrl(NULL, ctrl, &c, 0);
+	if (!rval)
+		cur_to_user(&c, ctrl);
+
+	return rval;
 }
-EXPORT_SYMBOL(v4l2_ctrl_s_ctrl_int64);
+EXPORT_SYMBOL(__v4l2_ctrl_s_ctrl_int64);
 
 void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
 {
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index 5d1a30ca29af..8c4edd69fa4b 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -679,6 +679,8 @@ void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void
   */
 s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl);
 
+/** __v4l2_ctrl_s_ctrl() - Unlocked variant of v4l2_ctrl_s_ctrl(). */
+int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val);
 /** v4l2_ctrl_s_ctrl() - Helper function to set the control's value from within a driver.
   * @ctrl:	The control.
   * @val:	The new value.
@@ -689,7 +691,16 @@ s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl);
   *
   * This function is for integer type controls only.
   */
-int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val);
+static inline int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
+{
+	int rval;
+
+	v4l2_ctrl_lock(ctrl);
+	rval = __v4l2_ctrl_s_ctrl(ctrl, val);
+	v4l2_ctrl_unlock(ctrl);
+
+	return rval;
+}
 
 /** v4l2_ctrl_g_ctrl_int64() - Helper function to get a 64-bit control's value from within a driver.
   * @ctrl:	The control.
@@ -702,6 +713,9 @@ int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val);
   */
 s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl);
 
+/** __v4l2_ctrl_s_ctrl_int64() - Unlocked variant of v4l2_ctrl_s_ctrl_int64(). */
+int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val);
+
 /** v4l2_ctrl_s_ctrl_int64() - Helper function to set a 64-bit control's value from within a driver.
   * @ctrl:	The control.
   * @val:	The new value.
@@ -712,7 +726,16 @@ s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl);
   *
   * This function is for 64-bit integer type controls only.
   */
-int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val);
+static inline int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
+{
+	int rval;
+
+	v4l2_ctrl_lock(ctrl);
+	rval = __v4l2_ctrl_s_ctrl_int64(ctrl, val);
+	v4l2_ctrl_unlock(ctrl);
+
+	return rval;
+}
 
 /* Internal helper functions that deal with control events. */
 extern const struct v4l2_subscribed_event_ops v4l2_ctrl_sub_ev_ops;