| 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(v: 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(v: 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(timeout: 1); |
| 24 | } |
| 25 | } |
| 26 | EXPORT_SYMBOL(snd_use_lock_sync_helper); |
| 27 |