diff options
| -rw-r--r-- | drivers/media/dvb-core/dvb_frontend.c | 33 |
1 files changed, 25 insertions, 8 deletions
diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c index c0142614c408..be99c8dbc5f8 100644 --- a/drivers/media/dvb-core/dvb_frontend.c +++ b/drivers/media/dvb-core/dvb_frontend.c @@ -99,6 +99,7 @@ MODULE_PARM_DESC(dvb_mfe_wait_time, "Wait up to <mfe_wait_time> seconds on open( static DEFINE_MUTEX(frontend_mutex); struct dvb_frontend_private { + struct kref refcount; /* thread/frontend values */ struct dvb_device *dvbdev; @@ -137,6 +138,23 @@ struct dvb_frontend_private { #endif }; +static void dvb_frontend_private_free(struct kref *ref) +{ + struct dvb_frontend_private *fepriv = + container_of(ref, struct dvb_frontend_private, refcount); + kfree(fepriv); +} + +static void dvb_frontend_private_put(struct dvb_frontend_private *fepriv) +{ + kref_put(&fepriv->refcount, dvb_frontend_private_free); +} + +static void dvb_frontend_private_get(struct dvb_frontend_private *fepriv) +{ + kref_get(&fepriv->refcount); +} + static void dvb_frontend_wakeup(struct dvb_frontend *fe); static int dtv_get_frontend(struct dvb_frontend *fe, struct dtv_frontend_properties *c, @@ -2543,6 +2561,8 @@ static int dvb_frontend_open(struct inode *inode, struct file *file) fepriv->events.eventr = fepriv->events.eventw = 0; } + dvb_frontend_private_get(fepriv); + if (adapter->mfe_shared) mutex_unlock (&adapter->mfe_lock); return ret; @@ -2591,6 +2611,8 @@ static int dvb_frontend_release(struct inode *inode, struct file *file) fe->ops.ts_bus_ctrl(fe, 0); } + dvb_frontend_private_put(fepriv); + return ret; } @@ -2679,6 +2701,8 @@ int dvb_register_frontend(struct dvb_adapter* dvb, } fepriv = fe->frontend_priv; + kref_init(&fepriv->refcount); + sema_init(&fepriv->sem, 1); init_waitqueue_head (&fepriv->wait_queue); init_waitqueue_head (&fepriv->events.wait_queue); @@ -2713,18 +2737,11 @@ int dvb_unregister_frontend(struct dvb_frontend* fe) mutex_lock(&frontend_mutex); dvb_frontend_stop (fe); - mutex_unlock(&frontend_mutex); - - if (fepriv->dvbdev->users < -1) - wait_event(fepriv->dvbdev->wait_queue, - fepriv->dvbdev->users==-1); - - mutex_lock(&frontend_mutex); dvb_unregister_device (fepriv->dvbdev); /* fe is invalid now */ - kfree(fepriv); mutex_unlock(&frontend_mutex); + dvb_frontend_private_put(fepriv); return 0; } EXPORT_SYMBOL(dvb_unregister_frontend); |