1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Do sleep inside a spin-lock
4 * Copyright (c) 1999 by Takashi Iwai <tiwai@suse.de>
5 */
6
7 #include <linux/export.h>
8 #include <sound/core.h>
9 #include "seq_lock.h"
10
11 /* wait until all locks are released */
snd_use_lock_sync_helper(snd_use_lock_t * lockp,const char * file,int line)12 void snd_use_lock_sync_helper(snd_use_lock_t *lockp, const char *file, int line)
13 {
14 int warn_count = 5 * HZ;
15
16 if (atomic_read(lockp) < 0) {
17 pr_warn("ALSA: seq_lock: lock trouble [counter = %d] in %s:%d\n", atomic_read(lockp), file, line);
18 return;
19 }
20 while (atomic_read(lockp) > 0) {
21 if (warn_count-- == 0)
22 pr_warn("ALSA: seq_lock: waiting [%d left] in %s:%d\n", atomic_read(lockp), file, line);
23 schedule_timeout_uninterruptible(1);
24 }
25 }
26 EXPORT_SYMBOL(snd_use_lock_sync_helper);
27