3 files changed, 28 insertions, 4 deletions

diff --git a/drivers/media/dvb/dvb-core/dmxdev.c b/drivers/media/dvb/dvb-core/dmxdev.c
index 09e96e9ddbd..04578df3f24 100644
--- a/drivers/media/dvb/dvb-core/dmxdev.c
+++ b/drivers/media/dvb/dvb-core/dmxdev.c
@@ -141,12 +141,18 @@ static int dvb_dvr_open(struct inode *inode, struct file *file)
 	}
 
 	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
-		void *mem = vmalloc(DVR_BUFFER_SIZE);
+		void *mem;
+		if (!dvbdev->readers) {
+			mutex_unlock(&dmxdev->mutex);
+			return -EBUSY;
+		}
+		mem = vmalloc(DVR_BUFFER_SIZE);
 		if (!mem) {
 			mutex_unlock(&dmxdev->mutex);
 			return -ENOMEM;
 		}
 		dvb_ringbuffer_init(&dmxdev->dvr_buffer, mem, DVR_BUFFER_SIZE);
+		dvbdev->readers--;
 	}
 
 	if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
@@ -184,6 +190,7 @@ static int dvb_dvr_release(struct inode *inode, struct file *file)
 						dmxdev->dvr_orig_fe);
 	}
 	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
+		dvbdev->readers++;
 		if (dmxdev->dvr_buffer.data) {
 			void *mem = dmxdev->dvr_buffer.data;
 			mb();
@@ -1029,8 +1036,7 @@ static struct file_operations dvb_dvr_fops = {
 
 static struct dvb_device dvbdev_dvr = {
 	.priv = NULL,
-	.users = 1,
-	.writers = 1,
+	.readers = 1,
 	.fops = &dvb_dvr_fops
 };
 
diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c
index 2c3ea8f95dc..4f8f257e679 100644
--- a/drivers/media/dvb/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.c
@@ -105,6 +105,7 @@ struct dvb_frontend_private {
 	fe_status_t status;
 	unsigned long tune_mode_flags;
 	unsigned int delay;
+	unsigned int reinitialise;
 
 	/* swzigzag values */
 	unsigned int state;
@@ -121,6 +122,7 @@ struct dvb_frontend_private {
 	unsigned int check_wrapped;
 };
 
+static void dvb_frontend_wakeup(struct dvb_frontend *fe);
 
 static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status)
 {
@@ -213,6 +215,15 @@ static void dvb_frontend_init(struct dvb_frontend *fe)
 		fe->ops->init(fe);
 }
 
+void dvb_frontend_reinitialise(struct dvb_frontend *fe)
+{
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
+
+	fepriv->reinitialise = 1;
+	dvb_frontend_wakeup(fe);
+}
+EXPORT_SYMBOL(dvb_frontend_reinitialise);
+
 static void dvb_frontend_swzigzag_update_delay(struct dvb_frontend_private *fepriv, int locked)
 {
 	int q2;
@@ -505,8 +516,8 @@ static int dvb_frontend_thread(void *data)
 	fepriv->quality = 0;
 	fepriv->delay = 3*HZ;
 	fepriv->status = 0;
-	dvb_frontend_init(fe);
 	fepriv->wakeup = 0;
+	fepriv->reinitialise = 1;
 
 	while (1) {
 		up(&fepriv->sem);	    /* is locked when we enter the thread... */
@@ -524,6 +535,11 @@ static int dvb_frontend_thread(void *data)
 		if (down_interruptible(&fepriv->sem))
 			break;
 
+		if (fepriv->reinitialise) {
+			dvb_frontend_init(fe);
+			fepriv->reinitialise = 0;
+		}
+
 		/* do an iteration of the tuning loop */
 		if (fe->ops->tune) {
 			/* have we been asked to retune? */
diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.h b/drivers/media/dvb/dvb-core/dvb_frontend.h
index d5aee5ad67a..5926a3b745c 100644
--- a/drivers/media/dvb/dvb-core/dvb_frontend.h
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.h
@@ -112,6 +112,8 @@ extern int dvb_register_frontend(struct dvb_adapter* dvb,
 
 extern int dvb_unregister_frontend(struct dvb_frontend* fe);
 
+extern void dvb_frontend_reinitialise(struct dvb_frontend *fe);
+
 extern void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec);
 extern s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime);