LXR linux/sound/core/seq/seq

   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 */
  12void 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}
  26EXPORT_SYMBOL(snd_use_lock_sync_helper);
  27