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 */ 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