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uml: port mutex conversion 

The port_sem is already used as a mutex since it's using DECLARE_MUTEX(), but
the underlying construct is still a semaphore ..  This patch switches it over
to a struct mutex.

Signed-off-by: Daniel Walker <dwalker@mvista.com>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Daniel Walker 2008-02-04 22:31:27 -08:00 committed by Linus Torvalds
parent e98fa28160
commit 2aa9c5db8e
1 changed files with 4 additions and 3 deletions
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7
arch/um/drivers/port_kern.c
View File

@ -6,6 +6,7 @@
#include "linux/completion.h"
#include "linux/interrupt.h"
#include "linux/list.h"
#include "linux/mutex.h"
#include "asm/atomic.h"
#include "init.h"
#include "irq_kern.h"
@ -120,7 +121,7 @@ static int port_accept(struct port_list *port)
return 0;
}
static DECLARE_MUTEX(ports_sem);
static DEFINE_MUTEX(ports_mutex);
static LIST_HEAD(ports);
static void port_work_proc(struct work_struct *unused)
@ -161,7 +162,7 @@ void *port_data(int port_num)
struct port_dev *dev = NULL;
int fd;
down(&ports_sem);
mutex_lock(&ports_mutex);
list_for_each(ele, &ports) {
port = list_entry(ele, struct port_list, list);
if (port->port == port_num)
@ -216,7 +217,7 @@ void *port_data(int port_num)
out_free:
kfree(port);
out:
up(&ports_sem);
mutex_unlock(&ports_mutex);
return dev;
}