patched to 5.6, attempt 2

Author: dettus

sys/external/bsd/drm2/dist/drm/i915/i915_perf.c

@@ -3034,9 +3034,10 @@ static ssize_t i915_perf_read(struct file *file,
 	struct i915_perf_stream *stream = file->f_data;
 #else
 	struct i915_perf_stream *stream = file->private_data;
+	size_t offset = 0;
 #endif
 	struct i915_perf *perf = stream->perf;
-	size_t offset = 0;
+	int ret;
 
 	/* To ensure it's handled consistently we simply treat all reads of a
 	 * disabled stream as an error. In particular it might otherwise lead
@@ -3065,12 +3066,20 @@ static ssize_t i915_perf_read(struct file *file,
 				return ret;
 
 			mutex_lock(&perf->lock);
+#ifdef __NetBSD__
+			ret = stream->ops->read(stream, buf, count, offset);
+#else
 			ret = stream->ops->read(stream, buf, count, &offset);
+#endif
 			mutex_unlock(&perf->lock);
 		} while (!offset && !ret);
 	} else {
 		mutex_lock(&perf->lock);
+#ifdef __NetBSD__
+		ret = stream->ops->read(stream, buf, count, offset);
+#else
 		ret = stream->ops->read(stream, buf, count, &offset);
+#endif
 		mutex_unlock(&perf->lock);
 	}