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-rw-r--r--sound/core/init.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/sound/core/init.c b/sound/core/init.c
index 32ebe2f6bc59..168ae03d3a1c 100644
--- a/sound/core/init.c
+++ b/sound/core/init.c
@@ -255,6 +255,7 @@ int snd_card_new(struct device *parent, int idx, const char *xid,
#ifdef CONFIG_PM
init_waitqueue_head(&card->power_sleep);
#endif
+ init_waitqueue_head(&card->remove_sleep);
device_initialize(&card->card_dev);
card->card_dev.parent = parent;
@@ -452,6 +453,35 @@ int snd_card_disconnect(struct snd_card *card)
}
EXPORT_SYMBOL(snd_card_disconnect);
+/**
+ * snd_card_disconnect_sync - disconnect card and wait until files get closed
+ * @card: card object to disconnect
+ *
+ * This calls snd_card_disconnect() for disconnecting all belonging components
+ * and waits until all pending files get closed.
+ * It assures that all accesses from user-space finished so that the driver
+ * can release its resources gracefully.
+ */
+void snd_card_disconnect_sync(struct snd_card *card)
+{
+ int err;
+
+ err = snd_card_disconnect(card);
+ if (err < 0) {
+ dev_err(card->dev,
+ "snd_card_disconnect error (%d), skipping sync\n",
+ err);
+ return;
+ }
+
+ spin_lock_irq(&card->files_lock);
+ wait_event_lock_irq(card->remove_sleep,
+ list_empty(&card->files_list),
+ card->files_lock);
+ spin_unlock_irq(&card->files_lock);
+}
+EXPORT_SYMBOL_GPL(snd_card_disconnect_sync);
+
static int snd_card_do_free(struct snd_card *card)
{
#if IS_ENABLED(CONFIG_SND_MIXER_OSS)
@@ -957,6 +987,8 @@ int snd_card_file_remove(struct snd_card *card, struct file *file)
break;
}
}
+ if (list_empty(&card->files_list))
+ wake_up_all(&card->remove_sleep);
spin_unlock(&card->files_lock);
if (!found) {
dev_err(card->dev, "card file remove problem (%p)\n", file);