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[media] v4l2-ctrls.c: Implement unlocked variant of v4l2_ctrl_handler_setup() 

Sometimes the caller is already holding the control handler mutex and
using it to serialise something. Provide an unlocked variant of the same
function to be used in those cases.

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 <mchehab@s-opensource.com>
This commit is contained in:
Sakari Ailus 2017-05-26 05:21:37 -03:00 committed by Mauro Carvalho Chehab
parent ec62c9a54c
commit cc0140e2a0
2 changed files with 32 additions and 2 deletions
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21
drivers/media/v4l2-core/v4l2-ctrls.c
View File

@ -2444,14 +2444,16 @@ int v4l2_ctrl_subdev_log_status(struct v4l2_subdev *sd)
EXPORT_SYMBOL(v4l2_ctrl_subdev_log_status);
/* Call s_ctrl for all controls owned by the handler */
int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
int __v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
{
struct v4l2_ctrl *ctrl;
int ret = 0;
if (hdl == NULL)
return 0;
mutex_lock(hdl->lock);
lockdep_assert_held(hdl->lock);
list_for_each_entry(ctrl, &hdl->ctrls, node)
ctrl->done = false;
@ -2476,7 +2478,22 @@ int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
if (ret)
break;
}
return ret;
}
EXPORT_SYMBOL_GPL(__v4l2_ctrl_handler_setup);
int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
{
int ret;
if (hdl == NULL)
return 0;
mutex_lock(hdl->lock);
ret = __v4l2_ctrl_handler_setup(hdl);
mutex_unlock(hdl->lock);
return ret;
}
EXPORT_SYMBOL(v4l2_ctrl_handler_setup);

13
include/media/v4l2-ctrls.h
View File

@ -457,6 +457,19 @@ static inline void v4l2_ctrl_unlock(struct v4l2_ctrl *ctrl)
mutex_unlock(ctrl->handler->lock);
}
/**
* __v4l2_ctrl_handler_setup() - Call the s_ctrl op for all controls belonging
* to the handler to initialize the hardware to the current control values. The
* caller is responsible for acquiring the control handler mutex on behalf of
* __v4l2_ctrl_handler_setup().
* @hdl: The control handler.
*
* Button controls will be skipped, as are read-only controls.
*
* If @hdl == NULL, then this just returns 0.
*/
int __v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl);
/**
* v4l2_ctrl_handler_setup() - Call the s_ctrl op for all controls belonging
* to the handler to initialize the hardware to the current control values.