linux-kernel - [PATCH 3/5] Use mutex instead of semaphore in CAPI 2.0 driver

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Date:	Mon, 14 May 2007 11:17:01 +0200
From:	Matthias Kaehlcke <matthias.kaehlcke@...il.com>
To:	kkeil@...e.de, isdn4linux@...tserv.isdn4linux.de
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: [PATCH 3/5] Use mutex instead of semaphore in CAPI 2.0 driver

The CAPI 2.0 driver 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/isdn/capi/kcapi.c b/drivers/isdn/capi/kcapi.c
index 3ed34f7..9f73bc2 100644
--- a/drivers/isdn/capi/kcapi.c
+++ b/drivers/isdn/capi/kcapi.c
@@ -258,7 +258,7 @@ static void recv_handler(struct work_struct *work)
 	if ((!ap) || (ap->release_in_progress))
 		return;
 
-	down(&ap->recv_sem);
+	mutex_lock(&ap->recv_mtx);
 	while ((skb = skb_dequeue(&ap->recv_queue))) {
 		if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_IND)
 			ap->nrecvdatapkt++;
@@ -267,7 +267,7 @@ static void recv_handler(struct work_struct *work)
 
 		ap->recv_message(ap, skb);
 	}
-	up(&ap->recv_sem);
+	mutex_unlock(&ap->recv_mtx);
 }
 
 void capi_ctr_handle_message(struct capi_ctr * card, u16 appl, struct sk_buff *skb)
@@ -547,7 +547,7 @@ u16 capi20_register(struct capi20_appl *ap)
 	ap->nsentctlpkt = 0;
 	ap->nsentdatapkt = 0;
 	ap->callback = NULL;
-	init_MUTEX(&ap->recv_sem);
+	mutex_init(&ap->recv_mtx);
 	skb_queue_head_init(&ap->recv_queue);
 	INIT_WORK(&ap->recv_work, recv_handler);
 	ap->release_in_progress = 0;
diff --git a/include/linux/kernelcapi.h b/include/linux/kernelcapi.h
index aea34e7..8c4350a 100644
--- a/include/linux/kernelcapi.h
+++ b/include/linux/kernelcapi.h
@@ -64,7 +64,7 @@ struct capi20_appl {
 	unsigned long nrecvdatapkt;
 	unsigned long nsentctlpkt;
 	unsigned long nsentdatapkt;
-	struct semaphore recv_sem;
+	struct mutex recv_mtx;
 	struct sk_buff_head recv_queue;
 	struct work_struct recv_work;
 	int release_in_progress;

-- 
Matthias Kaehlcke
Linux Application Developer
Barcelona

          Dreams and reality are opposites. Action synthesizes them
                             (Assata Shakur)
                                                                 .''`.
    using free software / Debian GNU/Linux | http://debian.org  : :'  :
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