drm/radeon: use pointers instead of indexes for CS chunks

Nobody is interested at which index the chunk is. What's needed is
a pointer to the chunk. Remove unused chunk_id field as well.

Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/radeon_uvd.c b/drivers/gpu/drm/radeon/radeon_uvd.c
index 72cd47d..c10b2ae 100644
--- a/drivers/gpu/drm/radeon/radeon_uvd.c
+++ b/drivers/gpu/drm/radeon/radeon_uvd.c
@@ -493,7 +493,7 @@
 	uint64_t start, end;
 	int r;
 
-	relocs_chunk = &p->chunks[p->chunk_relocs_idx];
+	relocs_chunk = p->chunk_relocs;
 	offset = radeon_get_ib_value(p, data0);
 	idx = radeon_get_ib_value(p, data1);
 	if (idx >= relocs_chunk->length_dw) {
@@ -610,13 +610,13 @@
 		[0x00000003]	=	2048,
 	};
 
-	if (p->chunks[p->chunk_ib_idx].length_dw % 16) {
+	if (p->chunk_ib->length_dw % 16) {
 		DRM_ERROR("UVD IB length (%d) not 16 dwords aligned!\n",
-			  p->chunks[p->chunk_ib_idx].length_dw);
+			  p->chunk_ib->length_dw);
 		return -EINVAL;
 	}
 
-	if (p->chunk_relocs_idx == -1) {
+	if (p->chunk_relocs == NULL) {
 		DRM_ERROR("No relocation chunk !\n");
 		return -EINVAL;
 	}
@@ -640,7 +640,7 @@
 			DRM_ERROR("Unknown packet type %d !\n", pkt.type);
 			return -EINVAL;
 		}
-	} while (p->idx < p->chunks[p->chunk_ib_idx].length_dw);
+	} while (p->idx < p->chunk_ib->length_dw);
 
 	if (!has_msg_cmd) {
 		DRM_ERROR("UVD-IBs need a msg command!\n");