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none X-Spam-Level: *** X-Spam-Score: 3.50 X-Spamd-Result: default: False [3.50 / 50.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; R_MISSING_CHARSET(2.50)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; BROKEN_CONTENT_TYPE(1.50)[]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-1.00)[-1.000]; RCVD_COUNT_THREE(0.00)[3]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; MID_CONTAINS_FROM(1.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email]; NEURAL_SPAM_SHORT(2.60)[0.868]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_ALL(0.00)[]; BAYES_HAM(-3.00)[100.00%] X-Spam-Flag: NO We can simplify the code gracefully with new guard() macro and co for automatic cleanup of locks. For making changes easier, some functions widen the application of register_mutex, but those shouldn't influence on any actual performance. Also, one code block was factored out as a function so that guard() can be applied cleanly without much indentation. There are still a few remaining explicit spin_lock/unlock calls, and those are for the places where we do temporary unlock/relock, which doesn't fit well with the guard(), so far. Only the code refactoring, and no functional changes. Signed-off-by: Takashi Iwai --- sound/core/timer.c | 429 ++++++++++++++++---------------------- sound/core/timer_compat.c | 7 +- 2 files changed, 177 insertions(+), 259 deletions(-) diff --git a/sound/core/timer.c b/sound/core/timer.c index a595c4fb4b2a..15b07d09c4b7 100644 --- a/sound/core/timer.c +++ b/sound/core/timer.c @@ -224,14 +224,12 @@ static int check_matching_master_slave(struct snd_timer_instance *master, return -EBUSY; list_move_tail(&slave->open_list, &master->slave_list_head); master->timer->num_instances++; - spin_lock_irq(&slave_active_lock); - spin_lock(&master->timer->lock); + guard(spinlock_irq)(&slave_active_lock); + guard(spinlock)(&master->timer->lock); slave->master = master; slave->timer = master->timer; if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) list_add_tail(&slave->active_list, &master->slave_active_head); - spin_unlock(&master->timer->lock); - spin_unlock_irq(&slave_active_lock); return 1; } @@ -382,6 +380,25 @@ int snd_timer_open(struct snd_timer_instance *timeri, } EXPORT_SYMBOL(snd_timer_open); +/* remove slave links, called from snd_timer_close_locked() below */ +static void remove_slave_links(struct snd_timer_instance *timeri, + struct snd_timer *timer) +{ + struct snd_timer_instance *slave, *tmp; + + guard(spinlock_irq)(&slave_active_lock); + guard(spinlock)(&timer->lock); + timeri->timer = NULL; + list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, open_list) { + list_move_tail(&slave->open_list, &snd_timer_slave_list); + timer->num_instances--; + slave->master = NULL; + slave->timer = NULL; + list_del_init(&slave->ack_list); + list_del_init(&slave->active_list); + } +} + /* * close a timer instance * call this with register_mutex down. @@ -390,12 +407,10 @@ static void snd_timer_close_locked(struct snd_timer_instance *timeri, struct device **card_devp_to_put) { struct snd_timer *timer = timeri->timer; - struct snd_timer_instance *slave, *tmp; if (timer) { - spin_lock_irq(&timer->lock); + guard(spinlock)(&timer->lock); timeri->flags |= SNDRV_TIMER_IFLG_DEAD; - spin_unlock_irq(&timer->lock); } if (!list_empty(&timeri->open_list)) { @@ -418,21 +433,7 @@ static void snd_timer_close_locked(struct snd_timer_instance *timeri, } spin_unlock_irq(&timer->lock); - /* remove slave links */ - spin_lock_irq(&slave_active_lock); - spin_lock(&timer->lock); - timeri->timer = NULL; - list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, - open_list) { - list_move_tail(&slave->open_list, &snd_timer_slave_list); - timer->num_instances--; - slave->master = NULL; - slave->timer = NULL; - list_del_init(&slave->ack_list); - list_del_init(&slave->active_list); - } - spin_unlock(&timer->lock); - spin_unlock_irq(&slave_active_lock); + remove_slave_links(timeri, timer); /* slave doesn't need to release timer resources below */ if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) @@ -459,9 +460,8 @@ void snd_timer_close(struct snd_timer_instance *timeri) if (snd_BUG_ON(!timeri)) return; - mutex_lock(®ister_mutex); - snd_timer_close_locked(timeri, &card_dev_to_put); - mutex_unlock(®ister_mutex); + scoped_guard(mutex, ®ister_mutex) + snd_timer_close_locked(timeri, &card_dev_to_put); /* put_device() is called after unlock for avoiding deadlock */ if (card_dev_to_put) put_device(card_dev_to_put); @@ -480,15 +480,13 @@ unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) { struct snd_timer * timer; unsigned long ret = 0; - unsigned long flags; if (timeri == NULL) return 0; timer = timeri->timer; if (timer) { - spin_lock_irqsave(&timer->lock, flags); + guard(spinlock_irqsave)(&timer->lock); ret = snd_timer_hw_resolution(timer); - spin_unlock_irqrestore(&timer->lock, flags); } return ret; } @@ -532,26 +530,19 @@ static int snd_timer_start1(struct snd_timer_instance *timeri, { struct snd_timer *timer; int result; - unsigned long flags; timer = timeri->timer; if (!timer) return -EINVAL; - spin_lock_irqsave(&timer->lock, flags); - if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) { - result = -EINVAL; - goto unlock; - } - if (timer->card && timer->card->shutdown) { - result = -ENODEV; - goto unlock; - } + guard(spinlock_irqsave)(&timer->lock); + if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) + return -EINVAL; + if (timer->card && timer->card->shutdown) + return -ENODEV; if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING | - SNDRV_TIMER_IFLG_START)) { - result = -EBUSY; - goto unlock; - } + SNDRV_TIMER_IFLG_START)) + return -EBUSY; if (start) timeri->ticks = timeri->cticks = ticks; @@ -577,8 +568,6 @@ static int snd_timer_start1(struct snd_timer_instance *timeri, } snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START : SNDRV_TIMER_EVENT_CONTINUE); - unlock: - spin_unlock_irqrestore(&timer->lock, flags); return result; } @@ -586,53 +575,38 @@ static int snd_timer_start1(struct snd_timer_instance *timeri, static int snd_timer_start_slave(struct snd_timer_instance *timeri, bool start) { - unsigned long flags; - int err; - - spin_lock_irqsave(&slave_active_lock, flags); - if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) { - err = -EINVAL; - goto unlock; - } - if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) { - err = -EBUSY; - goto unlock; - } + guard(spinlock_irqsave)(&slave_active_lock); + if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) + return -EINVAL; + if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) + return -EBUSY; timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; if (timeri->master && timeri->timer) { - spin_lock(&timeri->timer->lock); + guard(spinlock)(&timeri->timer->lock); list_add_tail(&timeri->active_list, &timeri->master->slave_active_head); snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START : SNDRV_TIMER_EVENT_CONTINUE); - spin_unlock(&timeri->timer->lock); } - err = 1; /* delayed start */ - unlock: - spin_unlock_irqrestore(&slave_active_lock, flags); - return err; + return 1; /* delayed start */ } /* stop/pause a master timer */ static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop) { struct snd_timer *timer; - int result = 0; - unsigned long flags; timer = timeri->timer; if (!timer) return -EINVAL; - spin_lock_irqsave(&timer->lock, flags); + guard(spinlock_irqsave)(&timer->lock); list_del_init(&timeri->ack_list); list_del_init(&timeri->active_list); if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING | - SNDRV_TIMER_IFLG_START))) { - result = -EBUSY; - goto unlock; - } + SNDRV_TIMER_IFLG_START))) + return -EBUSY; if (timer->card && timer->card->shutdown) - goto unlock; + return 0; if (stop) { timeri->cticks = timeri->ticks; timeri->pticks = 0; @@ -656,30 +630,25 @@ static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop) timeri->flags |= SNDRV_TIMER_IFLG_PAUSED; snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP : SNDRV_TIMER_EVENT_PAUSE); - unlock: - spin_unlock_irqrestore(&timer->lock, flags); - return result; + return 0; } /* stop/pause a slave timer */ static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop) { - unsigned long flags; bool running; - spin_lock_irqsave(&slave_active_lock, flags); + guard(spinlock_irqsave)(&slave_active_lock); running = timeri->flags & SNDRV_TIMER_IFLG_RUNNING; timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; if (timeri->timer) { - spin_lock(&timeri->timer->lock); + guard(spinlock)(&timeri->timer->lock); list_del_init(&timeri->ack_list); list_del_init(&timeri->active_list); if (running) snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP : SNDRV_TIMER_EVENT_PAUSE); - spin_unlock(&timeri->timer->lock); } - spin_unlock_irqrestore(&slave_active_lock, flags); return running ? 0 : -EBUSY; } @@ -804,12 +773,9 @@ static void snd_timer_process_callbacks(struct snd_timer *timer, static void snd_timer_clear_callbacks(struct snd_timer *timer, struct list_head *head) { - unsigned long flags; - - spin_lock_irqsave(&timer->lock, flags); + guard(spinlock_irqsave)(&timer->lock); while (!list_empty(head)) list_del_init(head->next); - spin_unlock_irqrestore(&timer->lock, flags); } /* @@ -819,16 +785,14 @@ static void snd_timer_clear_callbacks(struct snd_timer *timer, static void snd_timer_work(struct work_struct *work) { struct snd_timer *timer = container_of(work, struct snd_timer, task_work); - unsigned long flags; if (timer->card && timer->card->shutdown) { snd_timer_clear_callbacks(timer, &timer->sack_list_head); return; } - spin_lock_irqsave(&timer->lock, flags); + guard(spinlock_irqsave)(&timer->lock); snd_timer_process_callbacks(timer, &timer->sack_list_head); - spin_unlock_irqrestore(&timer->lock, flags); } /* @@ -842,8 +806,6 @@ void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) struct snd_timer_instance *ti, *ts, *tmp; unsigned long resolution; struct list_head *ack_list_head; - unsigned long flags; - bool use_work = false; if (timer == NULL) return; @@ -853,7 +815,7 @@ void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) return; } - spin_lock_irqsave(&timer->lock, flags); + guard(spinlock_irqsave)(&timer->lock); /* remember the current resolution */ resolution = snd_timer_hw_resolution(timer); @@ -919,10 +881,7 @@ void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) snd_timer_process_callbacks(timer, &timer->ack_list_head); /* do we have any slow callbacks? */ - use_work = !list_empty(&timer->sack_list_head); - spin_unlock_irqrestore(&timer->lock, flags); - - if (use_work) + if (!list_empty(&timer->sack_list_head)) queue_work(system_highpri_wq, &timer->task_work); } EXPORT_SYMBOL(snd_timer_interrupt); @@ -988,7 +947,7 @@ static int snd_timer_free(struct snd_timer *timer) if (!timer) return 0; - mutex_lock(®ister_mutex); + guard(mutex)(®ister_mutex); if (! list_empty(&timer->open_list_head)) { struct list_head *p, *n; struct snd_timer_instance *ti; @@ -1000,7 +959,6 @@ static int snd_timer_free(struct snd_timer *timer) } } list_del(&timer->device_list); - mutex_unlock(®ister_mutex); if (timer->private_free) timer->private_free(timer); @@ -1025,7 +983,7 @@ static int snd_timer_dev_register(struct snd_device *dev) !timer->hw.resolution && timer->hw.c_resolution == NULL) return -EINVAL; - mutex_lock(®ister_mutex); + guard(mutex)(®ister_mutex); list_for_each_entry(timer1, &snd_timer_list, device_list) { if (timer1->tmr_class > timer->tmr_class) break; @@ -1046,11 +1004,9 @@ static int snd_timer_dev_register(struct snd_device *dev) if (timer1->tmr_subdevice < timer->tmr_subdevice) continue; /* conflicts.. */ - mutex_unlock(®ister_mutex); return -EBUSY; } list_add_tail(&timer->device_list, &timer1->device_list); - mutex_unlock(®ister_mutex); return 0; } @@ -1059,20 +1015,18 @@ static int snd_timer_dev_disconnect(struct snd_device *device) struct snd_timer *timer = device->device_data; struct snd_timer_instance *ti; - mutex_lock(®ister_mutex); + guard(mutex)(®ister_mutex); list_del_init(&timer->device_list); /* wake up pending sleepers */ list_for_each_entry(ti, &timer->open_list_head, open_list) { if (ti->disconnect) ti->disconnect(ti); } - mutex_unlock(®ister_mutex); return 0; } void snd_timer_notify(struct snd_timer *timer, int event, struct timespec64 *tstamp) { - unsigned long flags; unsigned long resolution = 0; struct snd_timer_instance *ti, *ts; @@ -1083,7 +1037,7 @@ void snd_timer_notify(struct snd_timer *timer, int event, struct timespec64 *tst if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || event > SNDRV_TIMER_EVENT_MRESUME)) return; - spin_lock_irqsave(&timer->lock, flags); + guard(spinlock_irqsave)(&timer->lock); if (event == SNDRV_TIMER_EVENT_MSTART || event == SNDRV_TIMER_EVENT_MCONTINUE || event == SNDRV_TIMER_EVENT_MRESUME) @@ -1095,7 +1049,6 @@ void snd_timer_notify(struct snd_timer *timer, int event, struct timespec64 *tst if (ts->ccallback) ts->ccallback(ts, event, tstamp, resolution); } - spin_unlock_irqrestore(&timer->lock, flags); } EXPORT_SYMBOL(snd_timer_notify); @@ -1248,7 +1201,7 @@ static void snd_timer_proc_read(struct snd_info_entry *entry, struct snd_timer_instance *ti; unsigned long resolution; - mutex_lock(®ister_mutex); + guard(mutex)(®ister_mutex); list_for_each_entry(timer, &snd_timer_list, device_list) { if (timer->card && timer->card->shutdown) continue; @@ -1270,9 +1223,8 @@ static void snd_timer_proc_read(struct snd_info_entry *entry, timer->tmr_device, timer->tmr_subdevice); } snd_iprintf(buffer, "%s :", timer->name); - spin_lock_irq(&timer->lock); - resolution = snd_timer_hw_resolution(timer); - spin_unlock_irq(&timer->lock); + scoped_guard(spinlock_irq, &timer->lock) + resolution = snd_timer_hw_resolution(timer); if (resolution) snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", resolution / 1000, @@ -1288,7 +1240,6 @@ static void snd_timer_proc_read(struct snd_info_entry *entry, SNDRV_TIMER_IFLG_RUNNING)) ? "running" : "stopped"); } - mutex_unlock(®ister_mutex); } static struct snd_info_entry *snd_timer_proc_entry; @@ -1329,7 +1280,7 @@ static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, struct snd_timer_read *r; int prev; - spin_lock(&tu->qlock); + guard(spinlock)(&tu->qlock); if (tu->qused > 0) { prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; r = &tu->queue[prev]; @@ -1348,7 +1299,6 @@ static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, tu->qused++; } __wake: - spin_unlock(&tu->qlock); snd_kill_fasync(tu->fasync, SIGIO, POLL_IN); wake_up(&tu->qchange_sleep); } @@ -1372,7 +1322,6 @@ static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, { struct snd_timer_user *tu = timeri->callback_data; struct snd_timer_tread64 r1; - unsigned long flags; if (event >= SNDRV_TIMER_EVENT_START && event <= SNDRV_TIMER_EVENT_PAUSE) @@ -1384,9 +1333,8 @@ static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, r1.tstamp_sec = tstamp->tv_sec; r1.tstamp_nsec = tstamp->tv_nsec; r1.val = resolution; - spin_lock_irqsave(&tu->qlock, flags); - snd_timer_user_append_to_tqueue(tu, &r1); - spin_unlock_irqrestore(&tu->qlock, flags); + scoped_guard(spinlock_irqsave, &tu->qlock) + snd_timer_user_append_to_tqueue(tu, &r1); snd_kill_fasync(tu->fasync, SIGIO, POLL_IN); wake_up(&tu->qchange_sleep); } @@ -1410,51 +1358,48 @@ static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, memset(&r1, 0, sizeof(r1)); memset(&tstamp, 0, sizeof(tstamp)); - spin_lock(&tu->qlock); - if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | - (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { - spin_unlock(&tu->qlock); - return; - } - if (tu->last_resolution != resolution || ticks > 0) { - if (timer_tstamp_monotonic) - ktime_get_ts64(&tstamp); - else - ktime_get_real_ts64(&tstamp); - } - if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && - tu->last_resolution != resolution) { - r1.event = SNDRV_TIMER_EVENT_RESOLUTION; + scoped_guard(spinlock, &tu->qlock) { + if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | + (1 << SNDRV_TIMER_EVENT_TICK))) == 0) + return; + if (tu->last_resolution != resolution || ticks > 0) { + if (timer_tstamp_monotonic) + ktime_get_ts64(&tstamp); + else + ktime_get_real_ts64(&tstamp); + } + if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && + tu->last_resolution != resolution) { + r1.event = SNDRV_TIMER_EVENT_RESOLUTION; + r1.tstamp_sec = tstamp.tv_sec; + r1.tstamp_nsec = tstamp.tv_nsec; + r1.val = resolution; + snd_timer_user_append_to_tqueue(tu, &r1); + tu->last_resolution = resolution; + append++; + } + if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) + break; + if (ticks == 0) + break; + if (tu->qused > 0) { + prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; + r = &tu->tqueue[prev]; + if (r->event == SNDRV_TIMER_EVENT_TICK) { + r->tstamp_sec = tstamp.tv_sec; + r->tstamp_nsec = tstamp.tv_nsec; + r->val += ticks; + append++; + break; + } + } + r1.event = SNDRV_TIMER_EVENT_TICK; r1.tstamp_sec = tstamp.tv_sec; r1.tstamp_nsec = tstamp.tv_nsec; - r1.val = resolution; + r1.val = ticks; snd_timer_user_append_to_tqueue(tu, &r1); - tu->last_resolution = resolution; append++; } - if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) - goto __wake; - if (ticks == 0) - goto __wake; - if (tu->qused > 0) { - prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; - r = &tu->tqueue[prev]; - if (r->event == SNDRV_TIMER_EVENT_TICK) { - r->tstamp_sec = tstamp.tv_sec; - r->tstamp_nsec = tstamp.tv_nsec; - r->val += ticks; - append++; - goto __wake; - } - } - r1.event = SNDRV_TIMER_EVENT_TICK; - r1.tstamp_sec = tstamp.tv_sec; - r1.tstamp_nsec = tstamp.tv_nsec; - r1.val = ticks; - snd_timer_user_append_to_tqueue(tu, &r1); - append++; - __wake: - spin_unlock(&tu->qlock); if (append == 0) return; snd_kill_fasync(tu->fasync, SIGIO, POLL_IN); @@ -1476,14 +1421,13 @@ static int realloc_user_queue(struct snd_timer_user *tu, int size) return -ENOMEM; } - spin_lock_irq(&tu->qlock); + guard(spinlock_irq)(&tu->qlock); kfree(tu->queue); kfree(tu->tqueue); tu->queue_size = size; tu->queue = queue; tu->tqueue = tqueue; tu->qhead = tu->qtail = tu->qused = 0; - spin_unlock_irq(&tu->qlock); return 0; } @@ -1519,12 +1463,12 @@ static int snd_timer_user_release(struct inode *inode, struct file *file) if (file->private_data) { tu = file->private_data; file->private_data = NULL; - mutex_lock(&tu->ioctl_lock); - if (tu->timeri) { - snd_timer_close(tu->timeri); - snd_timer_instance_free(tu->timeri); + scoped_guard(mutex, &tu->ioctl_lock) { + if (tu->timeri) { + snd_timer_close(tu->timeri); + snd_timer_instance_free(tu->timeri); + } } - mutex_unlock(&tu->ioctl_lock); snd_fasync_free(tu->fasync); kfree(tu->queue); kfree(tu->tqueue); @@ -1559,7 +1503,7 @@ static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) if (copy_from_user(&id, _tid, sizeof(id))) return -EFAULT; - mutex_lock(®ister_mutex); + guard(mutex)(®ister_mutex); if (id.dev_class < 0) { /* first item */ if (list_empty(&snd_timer_list)) snd_timer_user_zero_id(&id); @@ -1636,7 +1580,6 @@ static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) snd_timer_user_zero_id(&id); } } - mutex_unlock(®ister_mutex); if (copy_to_user(_tid, &id, sizeof(*_tid))) return -EFAULT; return 0; @@ -1649,7 +1592,6 @@ static int snd_timer_user_ginfo(struct file *file, struct snd_timer_id tid; struct snd_timer *t; struct list_head *p; - int err = 0; ginfo = memdup_user(_ginfo, sizeof(*ginfo)); if (IS_ERR(ginfo)) @@ -1658,56 +1600,42 @@ static int snd_timer_user_ginfo(struct file *file, tid = ginfo->tid; memset(ginfo, 0, sizeof(*ginfo)); ginfo->tid = tid; - mutex_lock(®ister_mutex); + guard(mutex)(®ister_mutex); t = snd_timer_find(&tid); - if (t != NULL) { - ginfo->card = t->card ? t->card->number : -1; - if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) - ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; - strscpy(ginfo->id, t->id, sizeof(ginfo->id)); - strscpy(ginfo->name, t->name, sizeof(ginfo->name)); - spin_lock_irq(&t->lock); + if (!t) + return -ENODEV; + ginfo->card = t->card ? t->card->number : -1; + if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) + ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; + strscpy(ginfo->id, t->id, sizeof(ginfo->id)); + strscpy(ginfo->name, t->name, sizeof(ginfo->name)); + scoped_guard(spinlock_irq, &t->lock) ginfo->resolution = snd_timer_hw_resolution(t); - spin_unlock_irq(&t->lock); - if (t->hw.resolution_min > 0) { - ginfo->resolution_min = t->hw.resolution_min; - ginfo->resolution_max = t->hw.resolution_max; - } - list_for_each(p, &t->open_list_head) { - ginfo->clients++; - } - } else { - err = -ENODEV; + if (t->hw.resolution_min > 0) { + ginfo->resolution_min = t->hw.resolution_min; + ginfo->resolution_max = t->hw.resolution_max; } - mutex_unlock(®ister_mutex); - if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) - err = -EFAULT; - return err; + list_for_each(p, &t->open_list_head) { + ginfo->clients++; + } + if (copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) + return -EFAULT; + return 0; } static int timer_set_gparams(struct snd_timer_gparams *gparams) { struct snd_timer *t; - int err; - mutex_lock(®ister_mutex); + guard(mutex)(®ister_mutex); t = snd_timer_find(&gparams->tid); - if (!t) { - err = -ENODEV; - goto _error; - } - if (!list_empty(&t->open_list_head)) { - err = -EBUSY; - goto _error; - } - if (!t->hw.set_period) { - err = -ENOSYS; - goto _error; - } - err = t->hw.set_period(t, gparams->period_num, gparams->period_den); -_error: - mutex_unlock(®ister_mutex); - return err; + if (!t) + return -ENODEV; + if (!list_empty(&t->open_list_head)) + return -EBUSY; + if (!t->hw.set_period) + return -ENOSYS; + return t->hw.set_period(t, gparams->period_num, gparams->period_den); } static int snd_timer_user_gparams(struct file *file, @@ -1733,10 +1661,10 @@ static int snd_timer_user_gstatus(struct file *file, tid = gstatus.tid; memset(&gstatus, 0, sizeof(gstatus)); gstatus.tid = tid; - mutex_lock(®ister_mutex); + guard(mutex)(®ister_mutex); t = snd_timer_find(&tid); if (t != NULL) { - spin_lock_irq(&t->lock); + guard(spinlock_irq)(&t->lock); gstatus.resolution = snd_timer_hw_resolution(t); if (t->hw.precise_resolution) { t->hw.precise_resolution(t, &gstatus.resolution_num, @@ -1745,11 +1673,9 @@ static int snd_timer_user_gstatus(struct file *file, gstatus.resolution_num = gstatus.resolution; gstatus.resolution_den = 1000000000uL; } - spin_unlock_irq(&t->lock); } else { err = -ENODEV; } - mutex_unlock(®ister_mutex); if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) err = -EFAULT; return err; @@ -1821,9 +1747,8 @@ static int snd_timer_user_info(struct file *file, info->flags |= SNDRV_TIMER_FLG_SLAVE; strscpy(info->id, t->id, sizeof(info->id)); strscpy(info->name, t->name, sizeof(info->name)); - spin_lock_irq(&t->lock); - info->resolution = snd_timer_hw_resolution(t); - spin_unlock_irq(&t->lock); + scoped_guard(spinlock_irq, &t->lock) + info->resolution = snd_timer_hw_resolution(t); if (copy_to_user(_info, info, sizeof(*_info))) return -EFAULT; return 0; @@ -1884,45 +1809,47 @@ static int snd_timer_user_params(struct file *file, goto _end; } snd_timer_stop(tu->timeri); - spin_lock_irq(&t->lock); - tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| - SNDRV_TIMER_IFLG_EXCLUSIVE| - SNDRV_TIMER_IFLG_EARLY_EVENT); - if (params.flags & SNDRV_TIMER_PSFLG_AUTO) - tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; - if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) - tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; - if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) - tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; - spin_unlock_irq(&t->lock); + scoped_guard(spinlock_irq, &t->lock) { + tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| + SNDRV_TIMER_IFLG_EXCLUSIVE| + SNDRV_TIMER_IFLG_EARLY_EVENT); + if (params.flags & SNDRV_TIMER_PSFLG_AUTO) + tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; + if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) + tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; + if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) + tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; + } if (params.queue_size > 0 && (unsigned int)tu->queue_size != params.queue_size) { err = realloc_user_queue(tu, params.queue_size); if (err < 0) goto _end; } - spin_lock_irq(&tu->qlock); - tu->qhead = tu->qtail = tu->qused = 0; - if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { - if (tu->tread) { - struct snd_timer_tread64 tread; - memset(&tread, 0, sizeof(tread)); - tread.event = SNDRV_TIMER_EVENT_EARLY; - tread.tstamp_sec = 0; - tread.tstamp_nsec = 0; - tread.val = 0; - snd_timer_user_append_to_tqueue(tu, &tread); - } else { - struct snd_timer_read *r = &tu->queue[0]; - r->resolution = 0; - r->ticks = 0; - tu->qused++; - tu->qtail++; + scoped_guard(spinlock_irq, &tu->qlock) { + tu->qhead = tu->qtail = tu->qused = 0; + if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { + if (tu->tread) { + struct snd_timer_tread64 tread; + + memset(&tread, 0, sizeof(tread)); + tread.event = SNDRV_TIMER_EVENT_EARLY; + tread.tstamp_sec = 0; + tread.tstamp_nsec = 0; + tread.val = 0; + snd_timer_user_append_to_tqueue(tu, &tread); + } else { + struct snd_timer_read *r = &tu->queue[0]; + + r->resolution = 0; + r->ticks = 0; + tu->qused++; + tu->qtail++; + } } + tu->filter = params.filter; + tu->ticks = params.ticks; } - tu->filter = params.filter; - tu->ticks = params.ticks; - spin_unlock_irq(&tu->qlock); err = 0; _end: if (copy_to_user(_params, ¶ms, sizeof(params))) @@ -1945,9 +1872,8 @@ static int snd_timer_user_status32(struct file *file, status.resolution = snd_timer_resolution(tu->timeri); status.lost = tu->timeri->lost; status.overrun = tu->overrun; - spin_lock_irq(&tu->qlock); - status.queue = tu->qused; - spin_unlock_irq(&tu->qlock); + scoped_guard(spinlock_irq, &tu->qlock) + status.queue = tu->qused; if (copy_to_user(_status, &status, sizeof(status))) return -EFAULT; return 0; @@ -1968,9 +1894,8 @@ static int snd_timer_user_status64(struct file *file, status.resolution = snd_timer_resolution(tu->timeri); status.lost = tu->timeri->lost; status.overrun = tu->overrun; - spin_lock_irq(&tu->qlock); - status.queue = tu->qused; - spin_unlock_irq(&tu->qlock); + scoped_guard(spinlock_irq, &tu->qlock) + status.queue = tu->qused; if (copy_to_user(_status, &status, sizeof(status))) return -EFAULT; return 0; @@ -2128,12 +2053,9 @@ static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct snd_timer_user *tu = file->private_data; - long ret; - mutex_lock(&tu->ioctl_lock); - ret = __snd_timer_user_ioctl(file, cmd, arg, false); - mutex_unlock(&tu->ioctl_lock); - return ret; + guard(mutex)(&tu->ioctl_lock); + return __snd_timer_user_ioctl(file, cmd, arg, false); } static int snd_timer_user_fasync(int fd, struct file * file, int on) @@ -2260,12 +2182,11 @@ static __poll_t snd_timer_user_poll(struct file *file, poll_table * wait) poll_wait(file, &tu->qchange_sleep, wait); mask = 0; - spin_lock_irq(&tu->qlock); + guard(spinlock_irq)(&tu->qlock); if (tu->qused) mask |= EPOLLIN | EPOLLRDNORM; if (tu->disconnected) mask |= EPOLLERR; - spin_unlock_irq(&tu->qlock); return mask; } diff --git a/sound/core/timer_compat.c b/sound/core/timer_compat.c index ee973b7b8044..4ae9eaeb5afb 100644 --- a/sound/core/timer_compat.c +++ b/sound/core/timer_compat.c @@ -115,10 +115,7 @@ static long snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) { struct snd_timer_user *tu = file->private_data; - long ret; - mutex_lock(&tu->ioctl_lock); - ret = __snd_timer_user_ioctl_compat(file, cmd, arg); - mutex_unlock(&tu->ioctl_lock); - return ret; + guard(mutex)(&tu->ioctl_lock); + return __snd_timer_user_ioctl_compat(file, cmd, arg); }