V4L/DVB (5512): Fix 3/3 for bug 7819: fixed hotplugging for dvbnet

fixed hotplugging for dvbnet
Signed-off-by: Michal CIJOML Semler <cijoml@volny.cz>
Signed-off-by: Markus Rechberger <markus.rechberger@amd.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/dvb-core/dvb_demux.c

@@ -1208,8 +1208,6 @@ int dvb_dmx_init(struct dvb_demux *dvbdemux)
 	dmx->disconnect_frontend = dvbdmx_disconnect_frontend;
 	dmx->get_pes_pids = dvbdmx_get_pes_pids;
 
-	init_waitqueue_head (&dvbdemux->wait_queue);
-
 	mutex_init(&dvbdemux->mutex);
 	spin_lock_init(&dvbdemux->lock);
 

drivers/media/dvb/dvb-core/dvb_demux.h

@@ -119,7 +119,6 @@ struct dvb_demux {
 	u16 pids[DMX_TS_PES_OTHER];
 	int playing;
 	int recording;
-	wait_queue_head_t	  wait_queue;
 
 #define DMX_MAX_PID 0x2000
 	struct list_head feed_list;

drivers/media/dvb/dvb-core/dvb_net.c

@@ -1439,11 +1439,36 @@ static int dvb_net_ioctl(struct inode *inode, struct file *file,
 	return dvb_usercopy(inode, file, cmd, arg, dvb_net_do_ioctl);
 }
 
+static int dvb_net_close(struct inode *inode, struct file *file)
+{
+	struct dvb_device *dvbdev = file->private_data;
+	struct dvb_net *dvbnet = dvbdev->priv;
+
+	if (!dvbdev)
+		return -ENODEV;
+
+	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
+		dvbdev->readers++;
+	} else {
+		dvbdev->writers++;
+	}
+
+	dvbdev->users++;
+
+	if(dvbdev->users == 1 && dvbnet->exit==1) {
+		fops_put(file->f_op);
+		file->f_op = NULL;
+		wake_up(&dvbdev->wait_queue);
+	}
+	return 0;
+}
+
+
 static struct file_operations dvb_net_fops = {
 	.owner = THIS_MODULE,
 	.ioctl = dvb_net_ioctl,
 	.open =	dvb_generic_open,
-	.release = dvb_generic_release,
+	.release = dvb_net_close,
 };
 
 static struct dvb_device dvbdev_net = {
@@ -1458,6 +1483,11 @@ void dvb_net_release (struct dvb_net *dvbnet)
 {
 	int i;
 
+	dvbnet->exit = 1;
+	if (dvbnet->dvbdev->users < 1)
+		wait_event(dvbnet->dvbdev->wait_queue,
+				dvbnet->dvbdev->users==1);
+
 	dvb_unregister_device(dvbnet->dvbdev);
 
 	for (i=0; i<DVB_NET_DEVICES_MAX; i++) {

drivers/media/dvb/dvb-core/dvb_net.h

@@ -36,6 +36,7 @@ struct dvb_net {
 	struct dvb_device *dvbdev;
 	struct net_device *device[DVB_NET_DEVICES_MAX];
 	int state[DVB_NET_DEVICES_MAX];
+	unsigned int exit:1;
 	struct dmx_demux *demux;
 };