[PATCH] media: v4l2: make alloction alogthim more robust and flexible

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Current algothim relies on the fact that caller will align the
size to PAGE_SIZE, otherwise order will be decreased to negative
when remain size is less than PAGE_SIZE, it makes the function
hard to be migrated.
This patch sloves the hidden problem.

Signed-off-by: Zhaowei Yuan <zhaowei.yuan@xxxxxxxxxxx>
---
 drivers/media/v4l2-core/videobuf2-dma-sg.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/videobuf2-dma-sg.c b/drivers/media/v4l2-core/videobuf2-dma-sg.c
index adefc31..40d18aa 100644
--- a/drivers/media/v4l2-core/videobuf2-dma-sg.c
+++ b/drivers/media/v4l2-core/videobuf2-dma-sg.c
@@ -58,7 +58,7 @@ static int vb2_dma_sg_alloc_compacted(struct vb2_dma_sg_buf *buf,

 		order = get_order(size);
 		/* Dont over allocate*/
-		if ((PAGE_SIZE << order) > size)
+		if (order > 0 && (PAGE_SIZE << order) > size)
 			order--;

 		pages = NULL;
--
1.7.9.5

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