sound/core/seq/seq_lock.c

   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);