[PATCH] drm/amdgpu: New method to check block continuous

[xinhui pan <xinhui.pan@amd.com>]

Blocks are not guarnteed to be in ascending order.

Signed-off-by: xinhui pan <xinhui.pan@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 21 ++++++++------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
index 27159f1d112e..17175d284869 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
@@ -59,22 +59,17 @@ amdgpu_vram_mgr_first_block(struct list_head *list)
 static inline bool amdgpu_is_vram_mgr_blocks_contiguous(struct list_head *head)
 {
 	struct drm_buddy_block *block;
-	u64 start, size;
+	u64 start = LONG_MAX, end = 0, size = 0;
 
-	block = amdgpu_vram_mgr_first_block(head);
-	if (!block)
-		return false;
+	list_for_each_entry(block, head, link) {
+		u64 bstart = amdgpu_vram_mgr_block_start(block);
+		u64 bsize = amdgpu_vram_mgr_block_size(block);
 
-	while (head != block->link.next) {
-		start = amdgpu_vram_mgr_block_start(block);
-		size = amdgpu_vram_mgr_block_size(block);
-
-		block = list_entry(block->link.next, struct drm_buddy_block, link);
-		if (start + size != amdgpu_vram_mgr_block_start(block))
-			return false;
+		start = min(bstart, start);
+		end = max(bstart + bsize, end);
+		size += bsize;
 	}
-
-	return true;
+	return end == start + size;
 }
 
 
-- 
2.34.1