[PATCH 4/5] media: dvb-core changes to use media tuner token api

Shuah Khan
2014-09-22T15:07:20Z

Change to hold media tuner token exclusive mode in
dvb_frontend_start() before starting the dvb thread
and release from dvb_frontend_thread() when thread
exits. dvb frontend thread is started only when the
dvb device is opened in Read/Write mode.

Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
---
drivers/media/dvb-core/dvb_frontend.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c
index c862ad7..22833c6 100644
--- a/drivers/media/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb-core/dvb_frontend.c
@@ -41,6 +41,7 @@
#include <linux/jiffies.h>
#include <linux/kthread.h>
#include <asm/processor.h>
+#include <linux/media_tknres.h>

#include "dvb_frontend.h"
#include "dvbdev.h"
@@ -742,6 +743,7 @@ restart:
if (semheld)
up(&fepriv->sem);
dvb_frontend_wakeup(fe);
+ media_put_tuner_tkn(fe->dvb->device, MEDIA_MODE_DVB);
return 0;
}

@@ -836,6 +838,13 @@ static int dvb_frontend_start(struct dvb_frontend *fe)
fepriv->state = FESTATE_IDLE;
fe->exit = DVB_FE_NO_EXIT;
fepriv->thread = NULL;
+
+ ret = media_get_tuner_tkn(fe->dvb->device, MEDIA_MODE_DVB);
+ if (ret == -EBUSY) {
+ dev_info(fe->dvb->device, "dvb: Tuner is busy\n");
+ return ret;
+ }
+
mb();

fe_thread = kthread_run(dvb_frontend_thread, fe,
@@ -846,6 +855,7 @@ static int dvb_frontend_start(struct dvb_frontend *fe)
"dvb_frontend_start: failed to start kthread (%d)\n",
ret);
up(&fepriv->sem);
+ media_put_tuner_tkn(fe->dvb->device, MEDIA_MODE_DVB);
return ret;
}
fepriv->thread = fe_thread;
--
1.7.10.4