[media] v4l: ctrls: Provide an unlocked variant of v4l2_ctrl_modify_range()

Drivers may use the v4l2_ctrl_modify_range() internally as part of other
operations that need to be both serialised using a driver's lock which can
also be used to serialise access to the control handler. Provide an unlocked
version of the function, __v4l2_ctrl_modify_range() which then may be used
by drivers for the purpose.

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>

1 files changed, 16 insertions, 2 deletions

diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index 4546233a9a3d..5d1a30ca29af 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -620,6 +620,11 @@ void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active);
   */
 void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed);
 
+
+/** __v4l2_ctrl_modify_range() - Unlocked variant of v4l2_ctrl_modify_range() */
+int __v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
+                             s64 min, s64 max, u64 step, s64 def);
+
 /** v4l2_ctrl_modify_range() - Update the range of a control.
   * @ctrl:      The control to update.
   * @min:       The control's minimum value.
@@ -637,8 +642,17 @@ void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed);
   * This function assumes that the control handler is not locked and will
   * take the lock itself.
   */
-int v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
-                        s64 min, s64 max, u64 step, s64 def);
+static inline int v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
+                                         s64 min, s64 max, u64 step, s64 def)
+{
+        int rval;
+
+        v4l2_ctrl_lock(ctrl);
+        rval = __v4l2_ctrl_modify_range(ctrl, min, max, step, def);
+        v4l2_ctrl_unlock(ctrl);
+
+        return rval;
+}
 
 /** v4l2_ctrl_notify() - Function to set a notify callback for a control.
   * @ctrl:      The control.