From 66ac2dc63510c11c149f1a4ba8ba1222df68355a Mon Sep 17 00:00:00 2001
From: Alexander Boettcher <alexander.boettcher@genode-labs.com>
Date: Fri, 6 Aug 2021 14:43:39 +0200
Subject: [PATCH] gpu/intel: avoid one-by-off in ring buffer

during wrap.

issue #4254
---
 repos/os/src/drivers/gpu/intel/ring_buffer.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/repos/os/src/drivers/gpu/intel/ring_buffer.h b/repos/os/src/drivers/gpu/intel/ring_buffer.h
index e835ad9425..5f9ffefeb5 100644
--- a/repos/os/src/drivers/gpu/intel/ring_buffer.h
+++ b/repos/os/src/drivers/gpu/intel/ring_buffer.h
@@ -112,7 +112,7 @@ class Igd::Ring_buffer
 			_dwords[index] = cmd.value;
 			_tail++;
 
-			if (_tail > _max) {
+			if (_tail >= _max) {
 				Genode::warning("ring buffer wrapped ",
 				                "_tail: ", _tail, " ", "_max: ", _max);
 				_tail = 0;