ALSA: Add a reference counter to card instance

[~andy/linux] / include / sound / core.h

diff --git a/include/sound/core.h b/include/sound/core.h
index bc056687f647f7aa9965d5ec4b297bbe9459e557..93896ad1fcdd70164c4254bd792d9b10da992b68 100644 (file)
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -132,6 +132,7 @@ struct snd_card {
        int shutdown;                   /* this card is going down */
        int free_on_last_close;         /* free in context of file_release */
        wait_queue_head_t shutdown_sleep;
+       atomic_t refcount;              /* refcount for disconnection */
        struct device *dev;             /* device assigned to this card */
        struct device *card_dev;        /* cardX object for sysfs */
 
@@ -189,6 +190,7 @@ struct snd_minor {
        const struct file_operations *f_ops;    /* file operations */
        void *private_data;             /* private data for f_ops->open */
        struct device *dev;             /* device for sysfs */
+       struct snd_card *card_ptr;      /* assigned card instance */
 };
 
 /* return a device pointer linked to each sound device as a parent */
@@ -295,6 +297,7 @@ int snd_card_info_done(void);
 int snd_component_add(struct snd_card *card, const char *component);
 int snd_card_file_add(struct snd_card *card, struct file *file);
 int snd_card_file_remove(struct snd_card *card, struct file *file);
+void snd_card_unref(struct snd_card *card);
 
 #define snd_card_set_dev(card, devptr) ((card)->dev = (devptr))