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/evergreen_cs.c b/drivers/gpu/drm/radeon/evergreen_cs.c
index a1dece6..924b1b7 100644
--- a/drivers/gpu/drm/radeon/evergreen_cs.c
+++ b/drivers/gpu/drm/radeon/evergreen_cs.c
@@ -2661,7 +2661,7 @@
 			p->track = NULL;
 			return r;
 		}
-	} while (p->idx < p->chunks[p->chunk_ib_idx].length_dw);
+	} while (p->idx < p->chunk_ib->length_dw);
 #if 0
 	for (r = 0; r < p->ib.length_dw; r++) {
 		printk(KERN_INFO "%05d  0x%08X\n", r, p->ib.ptr[r]);
@@ -2684,7 +2684,7 @@
  **/
 int evergreen_dma_cs_parse(struct radeon_cs_parser *p)
 {
-	struct radeon_cs_chunk *ib_chunk = &p->chunks[p->chunk_ib_idx];
+	struct radeon_cs_chunk *ib_chunk = p->chunk_ib;
 	struct radeon_bo_list *src_reloc, *dst_reloc, *dst2_reloc;
 	u32 header, cmd, count, sub_cmd;
 	volatile u32 *ib = p->ib.ptr;
@@ -3100,7 +3100,7 @@
 			DRM_ERROR("Unknown packet type %d at %d !\n", cmd, idx);
 			return -EINVAL;
 		}
-	} while (p->idx < p->chunks[p->chunk_ib_idx].length_dw);
+	} while (p->idx < p->chunk_ib->length_dw);
 #if 0
 	for (r = 0; r < p->ib->length_dw; r++) {
 		printk(KERN_INFO "%05d  0x%08X\n", r, p->ib.ptr[r]);