There multiple open-codes to get the hardware timer resolution. Make a local helper function snd_timer_hw_resolution() and call it from all relevant places.
There is no functional change by this, just a preliminary work for the following timer resolution hardening patch.
Signed-off-by: Takashi Iwai tiwai@suse.de --- sound/core/timer.c | 33 ++++++++++++++------------------- 1 file changed, 14 insertions(+), 19 deletions(-)
diff --git a/sound/core/timer.c b/sound/core/timer.c index dc87728c5b74..23b941df9c43 100644 --- a/sound/core/timer.c +++ b/sound/core/timer.c @@ -427,6 +427,14 @@ int snd_timer_close(struct snd_timer_instance *timeri) } EXPORT_SYMBOL(snd_timer_close);
+static unsigned long snd_timer_hw_resolution(struct snd_timer *timer) +{ + if (timer->hw.c_resolution) + return timer->hw.c_resolution(timer); + else + return timer->hw.resolution; +} + unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) { struct snd_timer * timer; @@ -434,11 +442,8 @@ unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) if (timeri == NULL) return 0; timer = timeri->timer; - if (timer) { - if (timer->hw.c_resolution) - return timer->hw.c_resolution(timer); - return timer->hw.resolution; - } + if (timer) + return snd_timer_hw_resolution(timer); return 0; } EXPORT_SYMBOL(snd_timer_resolution); @@ -771,10 +776,7 @@ void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) spin_lock_irqsave(&timer->lock, flags);
/* remember the current resolution */ - if (timer->hw.c_resolution) - resolution = timer->hw.c_resolution(timer); - else - resolution = timer->hw.resolution; + resolution = snd_timer_hw_resolution(timer);
/* loop for all active instances * Here we cannot use list_for_each_entry because the active_list of a @@ -1014,12 +1016,8 @@ void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstam spin_lock_irqsave(&timer->lock, flags); if (event == SNDRV_TIMER_EVENT_MSTART || event == SNDRV_TIMER_EVENT_MCONTINUE || - event == SNDRV_TIMER_EVENT_MRESUME) { - if (timer->hw.c_resolution) - resolution = timer->hw.c_resolution(timer); - else - resolution = timer->hw.resolution; - } + event == SNDRV_TIMER_EVENT_MRESUME) + resolution = snd_timer_hw_resolution(timer); list_for_each_entry(ti, &timer->active_list_head, active_list) { if (ti->ccallback) ti->ccallback(ti, event, tstamp, resolution); @@ -1656,10 +1654,7 @@ static int snd_timer_user_gstatus(struct file *file, mutex_lock(®ister_mutex); t = snd_timer_find(&tid); if (t != NULL) { - if (t->hw.c_resolution) - gstatus.resolution = t->hw.c_resolution(t); - else - gstatus.resolution = t->hw.resolution; + gstatus.resolution = snd_timer_hw_resolution(t); if (t->hw.precise_resolution) { t->hw.precise_resolution(t, &gstatus.resolution_num, &gstatus.resolution_den);