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| author |   Sakari Ailus <sakari.ailus@iki.fi> | 2012-01-24 21:05:34 -0300 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab@redhat.com> | 2012-05-14 08:46:27 -0300 |
| commit | 77e7c4e624404c6edb5686b3d5f873c6008ed6b0 (patch) | |
| tree | 1ba1d9903bb8eca6e3ca3439d3a5981274ea86ba /include/media | |
| parent | [media] v4l: Implement v4l2_subdev_link_validate() (diff) | |
| download | linux-dev-77e7c4e624404c6edb5686b3d5f873c6008ed6b0.tar.xz linux-dev-77e7c4e624404c6edb5686b3d5f873c6008ed6b0.zip | |
[media] v4l: Allow changing control handler lock
Allow choosing the lock used by the control handler. This may be handy
sometimes when a driver providing multiple subdevs does not want to use
several locks to serialise its functions.
Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'include/media')
| -rw-r--r-- | include/media/v4l2-ctrls.h | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h index c6f6b4c2c5f2..dde6fbacc271 100644 --- a/include/media/v4l2-ctrls.h +++ b/include/media/v4l2-ctrls.h @@ -167,7 +167,9 @@ struct v4l2_ctrl_ref { /** struct v4l2_ctrl_handler - The control handler keeps track of all the * controls: both the controls owned by the handler and those inherited * from other handlers. + * @_lock: Default for "lock". * @lock: Lock to control access to this handler and its controls. + * May be replaced by the user right after init. * @ctrls: The list of controls owned by this handler. * @ctrl_refs: The list of control references. * @cached: The last found control reference. It is common that the same @@ -178,7 +180,8 @@ struct v4l2_ctrl_ref { * @error: The error code of the first failed control addition. */ struct v4l2_ctrl_handler { - struct mutex lock; + struct mutex _lock; + struct mutex *lock; struct list_head ctrls; struct list_head ctrl_refs; struct v4l2_ctrl_ref *cached; @@ -455,7 +458,7 @@ void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed); */ static inline void v4l2_ctrl_lock(struct v4l2_ctrl *ctrl) { - mutex_lock(&ctrl->handler->lock); + mutex_lock(ctrl->handler->lock); } /** v4l2_ctrl_lock() - Helper function to unlock the handler @@ -464,7 +467,7 @@ static inline void v4l2_ctrl_lock(struct v4l2_ctrl *ctrl) */ static inline void v4l2_ctrl_unlock(struct v4l2_ctrl *ctrl) { - mutex_unlock(&ctrl->handler->lock); + mutex_unlock(ctrl->handler->lock); } /** v4l2_ctrl_g_ctrl() - Helper function to get the control's value from within a driver. |