lib: fix gen5 workaround emission

Using BEGIN_BATCH can lead to a nice inf recursion through require_space
-> flush_batch -> BEGIN_BATCH.

Also fix things up to always require BATCH_RESERVED. We need 2 dwords
for the gen5 workaround and 2 dwords for MI_BB_END.

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/intel_batchbuffer.h b/lib/intel_batchbuffer.h
index 4dffda7e..5a1fc178 100644
--- a/lib/intel_batchbuffer.h
+++ b/lib/intel_batchbuffer.h
@@ -63,7 +63,7 @@ static inline void
 intel_batchbuffer_require_space(struct intel_batchbuffer *batch,
                                 unsigned int sz)
 {
-	assert(sz < BATCH_SZ - 8);
+	assert(sz < BATCH_SZ - BATCH_RESERVED);
 	if (intel_batchbuffer_space(batch) < sz)
 		intel_batchbuffer_flush(batch);
 }