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Subject[PATCH 5/5] Use mutex instead of semaphore in the DVB frontend tuning interface
The DVB frontend tuning interface uses a semaphore as mutex. Use the
mutex API instead of the (binary) semaphore.

Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com>

--

diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c
index b6c7f66..e35dd17 100644
--- a/drivers/media/dvb/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.c
@@ -138,7 +138,7 @@ static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status)

dprintk ("%s\n", __FUNCTION__);

- if (down_interruptible (&events->sem))
+ if (mutex_lock_interruptible (&events->mtx))
return;

wp = (events->eventw + 1) % MAX_EVENT;
@@ -159,7 +159,7 @@ static void dvb_frontend_add_event(struct dvb_frontend *fe, fe_status_t status)

events->eventw = wp;

- up (&events->sem);
+ mutex_unlock(&events->mtx);

e->status = status;

@@ -197,7 +197,7 @@ static int dvb_frontend_get_event(struct dvb_frontend *fe,
return ret;
}

- if (down_interruptible (&events->sem))
+ if (mutex_lock_interruptible (&events->mtx))
return -ERESTARTSYS;

memcpy (event, &events->events[events->eventr],
@@ -205,7 +205,7 @@ static int dvb_frontend_get_event(struct dvb_frontend *fe,

events->eventr = (events->eventr + 1) % MAX_EVENT;

- up (&events->sem);
+ mutex_unlock(&events->mtx);

return 0;
}
@@ -1080,7 +1080,7 @@ int dvb_register_frontend(struct dvb_adapter* dvb,
init_MUTEX (&fepriv->sem);
init_waitqueue_head (&fepriv->wait_queue);
init_waitqueue_head (&fepriv->events.wait_queue);
- init_MUTEX (&fepriv->events.sem);
+ mutex_init(&fepriv->events.mtx);
fe->dvb = dvb;
fepriv->inversion = INVERSION_OFF;

diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.h b/drivers/media/dvb/dvb-core/dvb_frontend.h
index a770a87..f95de63 100644
--- a/drivers/media/dvb/dvb-core/dvb_frontend.h
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.h
@@ -35,6 +35,7 @@
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/delay.h>
+#include <linux/mutex.h>

#include <linux/dvb/frontend.h>

@@ -142,7 +143,7 @@ struct dvb_fe_events {
int eventr;
int overflow;
wait_queue_head_t wait_queue;
- struct semaphore sem;
+ struct mutex mtx;
};

struct dvb_frontend {

--
Matthias Kaehlcke
Linux Application Developer
Barcelona

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(Antonio Machado)
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