Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 41 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..cda64b489
--- /dev/null
+++ b/sound/core/seq/seq_lock.c
@@ -0,0 +1,41 @@
+/*
+ *  Do sleep inside a spin-lock
+ *  Copyright (c) 1999 by Takashi Iwai <tiwai@suse.de>
+ *
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ */
+
+#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);