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-rw-r--r--drivers/media/v4l2-core/v4l2-ctrls.c8
-rw-r--r--include/media/v4l2-ctrls.h26
2 files changed, 29 insertions, 5 deletions
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index ab393adf51eb..4c0ecf29d278 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -2511,14 +2511,15 @@ void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
}
EXPORT_SYMBOL(v4l2_ctrl_activate);
-void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
+void __v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
{
bool old;
if (ctrl == NULL)
return;
- v4l2_ctrl_lock(ctrl);
+ lockdep_assert_held(ctrl->handler->lock);
+
if (grabbed)
/* set V4L2_CTRL_FLAG_GRABBED */
old = test_and_set_bit(1, &ctrl->flags);
@@ -2527,9 +2528,8 @@ void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
old = test_and_clear_bit(1, &ctrl->flags);
if (old != grabbed)
send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
- v4l2_ctrl_unlock(ctrl);
}
-EXPORT_SYMBOL(v4l2_ctrl_grab);
+EXPORT_SYMBOL(__v4l2_ctrl_grab);
/* Log the control name and value */
static void log_ctrl(const struct v4l2_ctrl *ctrl,
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index f615ba1b29dd..ff89df428f79 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -729,6 +729,22 @@ struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id);
void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active);
/**
+ * __v4l2_ctrl_grab() - Unlocked variant of v4l2_ctrl_grab.
+ *
+ * @ctrl: The control to (de)activate.
+ * @grabbed: True if the control should become grabbed.
+ *
+ * This sets or clears the V4L2_CTRL_FLAG_GRABBED flag atomically.
+ * Does nothing if @ctrl == NULL.
+ * The V4L2_EVENT_CTRL event will be generated afterwards.
+ * This will usually be called when starting or stopping streaming in the
+ * driver.
+ *
+ * This function assumes that the control handler is locked by the caller.
+ */
+void __v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed);
+
+/**
* v4l2_ctrl_grab() - Mark the control as grabbed or not grabbed.
*
* @ctrl: The control to (de)activate.
@@ -743,7 +759,15 @@ void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active);
* This function assumes that the control handler is not locked and will
* take the lock itself.
*/
-void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed);
+static inline void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
+{
+ if (!ctrl)
+ return;
+
+ v4l2_ctrl_lock(ctrl);
+ __v4l2_ctrl_grab(ctrl, grabbed);
+ v4l2_ctrl_unlock(ctrl);
+}
/**
*__v4l2_ctrl_modify_range() - Unlocked variant of v4l2_ctrl_modify_range()