core/seq/seq_lock.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *  Do sleep inside a spin-lock
0004  *  Copyright (c) 1999 by Takashi Iwai <tiwai@suse.de>
0005  */
0006
0007 #include <linux/export.h>
0008 #include <sound/core.h>
0009 #include "seq_lock.h"
0010
0011 /* wait until all locks are released */
0012 void snd_use_lock_sync_helper(snd_use_lock_t *lockp, const char *file, int line)
0013 {
0014     int warn_count = 5 * HZ;
0015
0016     if (atomic_read(lockp) < 0) {
0017         pr_warn("ALSA: seq_lock: lock trouble [counter = %d] in %s:%d\n", atomic_read(lockp), file, line);
0018         return;
0019     }
0020     while (atomic_read(lockp) > 0) {
0021         if (warn_count-- == 0)
0022             pr_warn("ALSA: seq_lock: waiting [%d left] in %s:%d\n", atomic_read(lockp), file, line);
0023         schedule_timeout_uninterruptible(1);
0024     }
0025 }
0026 EXPORT_SYMBOL(snd_use_lock_sync_helper);