1 /* 2 * Do sleep inside a spin-lock 3 * Copyright (c) 1999 by Takashi Iwai <tiwai@suse.de> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/export.h> 23 #include <sound/core.h> 24 #include "seq_lock.h" 25 26 #if defined(CONFIG_SMP) || defined(CONFIG_SND_DEBUG) 27 28 /* wait until all locks are released */ 29 void snd_use_lock_sync_helper(snd_use_lock_t *lockp, const char *file, int line) 30 { 31 int max_count = 5 * HZ; 32 33 if (atomic_read(lockp) < 0) { 34 pr_warn("ALSA: seq_lock: lock trouble [counter = %d] in %s:%d\n", atomic_read(lockp), file, line); 35 return; 36 } 37 while (atomic_read(lockp) > 0) { 38 if (max_count == 0) { 39 pr_warn("ALSA: seq_lock: timeout [%d left] in %s:%d\n", atomic_read(lockp), file, line); 40 break; 41 } 42 schedule_timeout_uninterruptible(1); 43 max_count--; 44 } 45 } 46 47 EXPORT_SYMBOL(snd_use_lock_sync_helper); 48 49 #endif 50