diff options
| -rw-r--r-- | drivers/media/dvb-core/dvb_ca_en50221.c | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/drivers/media/dvb-core/dvb_ca_en50221.c b/drivers/media/dvb-core/dvb_ca_en50221.c index b1e3a26b1431..b5b5b195ea7f 100644 --- a/drivers/media/dvb-core/dvb_ca_en50221.c +++ b/drivers/media/dvb-core/dvb_ca_en50221.c @@ -123,6 +123,7 @@ struct dvb_ca_slot { /* Private CA-interface information */ struct dvb_ca_private { + struct kref refcount; /* pointer back to the public data structure */ struct dvb_ca_en50221 *pub; @@ -173,6 +174,22 @@ static void dvb_ca_private_free(struct dvb_ca_private *ca) kfree(ca); } +static void dvb_ca_private_release(struct kref *ref) +{ + struct dvb_ca_private *ca = container_of(ref, struct dvb_ca_private, refcount); + dvb_ca_private_free(ca); +} + +static void dvb_ca_private_get(struct dvb_ca_private *ca) +{ + kref_get(&ca->refcount); +} + +static void dvb_ca_private_put(struct dvb_ca_private *ca) +{ + kref_put(&ca->refcount, dvb_ca_private_release); +} + static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca); static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount); static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount); @@ -1570,6 +1587,8 @@ static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file) dvb_ca_en50221_thread_update_delay(ca); dvb_ca_en50221_thread_wakeup(ca); + dvb_ca_private_get(ca); + return 0; } @@ -1598,6 +1617,8 @@ static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file) module_put(ca->pub->owner); + dvb_ca_private_put(ca); + return err; } @@ -1693,6 +1714,7 @@ int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter, ret = -ENOMEM; goto exit; } + kref_init(&ca->refcount); ca->pub = pubca; ca->flags = flags; ca->slot_count = slot_count; @@ -1772,6 +1794,6 @@ void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca) for (i = 0; i < ca->slot_count; i++) { dvb_ca_en50221_slot_shutdown(ca, i); } - dvb_ca_private_free(ca); + dvb_ca_private_put(ca); pubca->private = NULL; } |