[PATCH 3/6] drm: Define a conditional guard for drm_dev_{enter,exit}()

[Boris Brezillon <boris.brezillon@collabora.com>]

Define a conditional drm_dev_access guard to automate the
drm_dev_{enter,exit}() sequence.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
 include/drm/drm_drv.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index 42fc085f986d..79d1958f93e4 100644
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -490,6 +490,15 @@ void drm_dev_unplug(struct drm_device *dev);
 int drm_dev_wedged_event(struct drm_device *dev, unsigned long method,
 			 struct drm_wedge_task_info *info);
 
+/*
+ * Only the conditional drm_dev_access guard is valid. The drm_dev one is
+ * here so we can extend it with a conditional variant.
+ */
+DEFINE_LOCK_GUARD_1(drm_dev, struct drm_device,
+		    { WARN_ON("Use cond guards"); _T->idx = -1; },
+		    drm_dev_exit(_T->idx), int idx);
+DEFINE_LOCK_GUARD_1_COND(drm_dev, _access, drm_dev_enter(_T->lock, &_T->idx));
+
 /**
  * drm_dev_is_unplugged - is a DRM device unplugged
  * @dev: DRM device

-- 
2.54.0