1 files changed, 26 insertions, 0 deletions
diff --git a/sound/core/seq/seq_lock.c b/sound/core/seq/seq_lock.c
new file mode 100644
index 000000000..48b4ffb4b
--- /dev/null
+++ b/sound/core/seq/seq_lock.c
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Do sleep inside a spin-lock
+ *  Copyright (c) 1999 by Takashi Iwai <tiwai@suse.de>
+ */
+
+#include <linux/export.h>
+#include <sound/core.h>
+#include "seq_lock.h"
+
+/* wait until all locks are released */
+void snd_use_lock_sync_helper(snd_use_lock_t *lockp, const char *file, int line)
+{
+	int warn_count = 5 * HZ;
+
+	if (atomic_read(lockp) < 0) {
+		pr_warn("ALSA: seq_lock: lock trouble [counter = %d] in %s:%d\n", atomic_read(lockp), file, line);
+		return;
+	}
+	while (atomic_read(lockp) > 0) {
+		if (warn_count-- == 0)
+			pr_warn("ALSA: seq_lock: waiting [%d left] in %s:%d\n", atomic_read(lockp), file, line);
+		schedule_timeout_uninterruptible(1);
+	}
+}
+EXPORT_SYMBOL(snd_use_lock_sync_helper);