linux-kernel - [PATCH 5/5] Use mutex instead of semaphore in the DVB frontend tuning interface

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Message-ID: <20070729214341.GH3432@traven>
Date:	Sun, 29 Jul 2007 23:43:41 +0200
From:	Matthias Kaehlcke <matthias.kaehlcke@...il.com>
To:	v4l-dvb-maintainer@...uxtv.org
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
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@...il.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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