Mesa (master): radeon: Add comment to explain logic for freeing dma buffers .

[Pauli Nieminen]

Module: Mesa
Branch: master
Commit: 0c0cea250d6615bbd500ac0b61b5d34bc61711cf
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=0c0cea250d6615bbd500ac0b61b5d34bc61711cf

Author: Pauli Nieminen <suokkos at gmail.com>
Date:   Thu Aug 20 18:57:35 2009 +0300

radeon: Add comment to explain logic for freeing dma buffers.

---

 src/mesa/drivers/dri/radeon/radeon_dma.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/dri/radeon/radeon_dma.c b/src/mesa/drivers/dri/radeon/radeon_dma.c
index 40082d0..7e6b74a 100644
--- a/src/mesa/drivers/dri/radeon/radeon_dma.c
+++ b/src/mesa/drivers/dri/radeon/radeon_dma.c
@@ -204,6 +204,9 @@ again_alloc:
 		}
 		insert_at_head(&rmesa->dma.reserved, dma_bo);
 	} else {
+		/* We push and pop buffers from end of list so we can keep
+		   counter on unused buffers for later freeing them from
+		   begin of list */
 		struct radeon_dma_bo *dma_bo = last_elem(&rmesa->dma.free);
 		assert(dma_bo->bo->cref == 1);
 		remove_from_list(dma_bo);