ALSA: timer: minimize open-coded access to hw.resolution

Some info-querying code still used hw.resolution directly instead of
calling snd_timer_hw_resolution(), thus missing a possible
hw.c_resolution callback. This patch rectifies that.

Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Link: https://lore.kernel.org/r/20230612191325.1315854-7-oswald.buddenhagen@gmx.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Author: ossilator

sound/core/timer.c

@@ -1246,6 +1246,7 @@ static void snd_timer_proc_read(struct snd_info_entry *entry,
 {
 	struct snd_timer *timer;
 	struct snd_timer_instance *ti;
+	unsigned long resolution;
 
 	mutex_lock(&register_mutex);
 	list_for_each_entry(timer, &snd_timer_list, device_list) {
@@ -1269,10 +1270,13 @@ static void snd_timer_proc_read(struct snd_info_entry *entry,
 				    timer->tmr_device, timer->tmr_subdevice);
 		}
 		snd_iprintf(buffer, "%s :", timer->name);
-		if (timer->hw.resolution)
+		spin_lock_irq(&timer->lock);
+		resolution = snd_timer_hw_resolution(timer);
+		spin_unlock_irq(&timer->lock);
+		if (resolution)
 			snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
-				    timer->hw.resolution / 1000,
-				    timer->hw.resolution % 1000,
+				    resolution / 1000,
+				    resolution % 1000,
 				    timer->hw.ticks);
 		if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)
 			snd_iprintf(buffer, " SLAVE");
@@ -1662,7 +1666,9 @@ static int snd_timer_user_ginfo(struct file *file,
 			ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
 		strscpy(ginfo->id, t->id, sizeof(ginfo->id));
 		strscpy(ginfo->name, t->name, sizeof(ginfo->name));
-		ginfo->resolution = t->hw.resolution;
+		spin_lock_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;
@@ -1817,7 +1823,9 @@ 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));
-	info->resolution = t->hw.resolution;
+	spin_lock_irq(&t->lock);
+	info->resolution = snd_timer_hw_resolution(t);
+	spin_unlock_irq(&t->lock);
 	if (copy_to_user(_info, info, sizeof(*_info)))
 		err = -EFAULT;
 	kfree(info);