Mesa (master): radeon: Fix legacy bo not to reuse dma buffers before refcount is 1.

[Michel Dänzer]

Module: Mesa
Branch: master
Commit: 284a7af274bc148f112bd0ebb40583923ee26b49
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=284a7af274bc148f112bd0ebb40583923ee26b49

Author: Pauli Nieminen <suokkos at gmail.com>
Date:   Sun Sep 20 22:24:35 2009 +0300

radeon: Fix legacy bo not to reuse dma buffers before refcount is 1.

This should help detecting possible memory leaks with dma buffers and prevent
possible visual corruption if data would be overwriten too early.

---

 src/mesa/drivers/dri/radeon/radeon_dma.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/mesa/drivers/dri/radeon/radeon_dma.c b/src/mesa/drivers/dri/radeon/radeon_dma.c
index c9a32c8..c6edbae 100644
--- a/src/mesa/drivers/dri/radeon/radeon_dma.c
+++ b/src/mesa/drivers/dri/radeon/radeon_dma.c
@@ -207,7 +207,6 @@ again_alloc:
 		   counter on unused buffers for later freeing them from
 		   begin of list */
 		dma_bo = last_elem(&rmesa->dma.free);
-		assert(dma_bo->bo->cref == 1);
 		remove_from_list(dma_bo);
 		insert_at_head(&rmesa->dma.reserved, dma_bo);
 	}
@@ -307,6 +306,10 @@ static int radeon_bo_is_idle(struct radeon_bo* bo)
 		WARN_ONCE("Your libdrm or kernel doesn't have support for busy query.\n"
 			"This may cause small performance drop for you.\n");
 	}
+	/* Protect against bug in legacy bo handling that causes bos stay
+	 * referenced even after they should be freed */
+	if (bo->cref != 1)
+		return 0;
 	return ret != -EBUSY;
 }
 
@@ -343,7 +346,9 @@ void radeonReleaseDmaRegions(radeonContextPtr rmesa)
 	foreach_s(dma_bo, temp, &rmesa->dma.wait) {
 		if (dma_bo->expire_counter == time) {
 			WARN_ONCE("Leaking dma buffer object!\n");
-			radeon_bo_unref(dma_bo->bo);
+			/* force free of buffer so we don't realy start
+			 * leaking stuff now*/
+			while ((dma_bo->bo = radeon_bo_unref(dma_bo->bo))) {}
 			remove_from_list(dma_bo);
 			FREE(dma_bo);
 			continue;