[PATCH] drm/radeon/kms: record object that have been list reserved

[Jerome Glisse]

list reservation was too optimistic about ttm object reservation
and could think that an object reserved by some other process
as reserved by the list reservation which was false. Thus when
unreserving the list it might unreserve object that it didn't
reserved in the list. Sorry if it's hard to follow but this
kind of things are just causing headheck.

Signed-off-by: Jerome Glisse <jglisse at redhat.com>
---
 drivers/gpu/drm/radeon/radeon.h        |    1 +
 drivers/gpu/drm/radeon/radeon_object.c |    6 +++++-
 2 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 5c9ce2b..66a37fb 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -261,6 +261,7 @@ struct radeon_bo_list {
 	unsigned		rdomain;
 	unsigned		wdomain;
 	u32			tiling_flags;
+	bool			reserved;
 };
 
 /*
diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index a8d18bc..d5b9373 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -301,6 +301,7 @@ int radeon_bo_list_reserve(struct list_head *head)
 		r = radeon_bo_reserve(lobj->bo, false);
 		if (unlikely(r != 0))
 			return r;
+		lobj->reserved = true;
 	}
 	return 0;
 }
@@ -311,7 +312,7 @@ void radeon_bo_list_unreserve(struct list_head *head)
 
 	list_for_each_entry(lobj, head, list) {
 		/* only unreserve object we successfully reserved */
-		if (radeon_bo_is_reserved(lobj->bo))
+		if (lobj->reserved && radeon_bo_is_reserved(lobj->bo))
 			radeon_bo_unreserve(lobj->bo);
 	}
 }
@@ -322,6 +323,9 @@ int radeon_bo_list_validate(struct list_head *head)
 	struct radeon_bo *bo;
 	int r;
 
+	list_for_each_entry(lobj, head, list) {
+		lobj->reserved = false;
+	}
 	r = radeon_bo_list_reserve(head);
 	if (unlikely(r != 0)) {
 		return r;
-- 
1.7.0.1