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USB: use mutex instead of semaphore in the ELAN U132 adapter driver 

The ELAN U132 adapter driver uses the semaphore u132_module_lock
as mutex. Use the mutex API instead of the (binary) semaphore.

Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Matthias Kaehlcke 2007-07-13 21:26:59 +02:00 committed by Greg Kroah-Hartman
parent 831c70fc13
commit d2066eb659
1 changed files with 9 additions and 8 deletions
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17
drivers/usb/host/u132-hcd.c
View File

@ -52,6 +52,7 @@
#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <linux/pci_ids.h>
#include <linux/mutex.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
@ -83,7 +84,7 @@ static DECLARE_WAIT_QUEUE_HEAD(u132_hcd_wait);
* u132_module_lock exists to protect access to global variables
*
*/
static struct semaphore u132_module_lock;
static struct mutex u132_module_lock;
static int u132_exiting = 0;
static int u132_instances = 0;
static struct list_head u132_static_list;
@ -258,10 +259,10 @@ static void u132_hcd_delete(struct kref *kref)
struct platform_device *pdev = u132->platform_dev;
struct usb_hcd *hcd = u132_to_hcd(u132);
u132->going += 1;
down(&u132_module_lock);
mutex_lock(&u132_module_lock);
list_del_init(&u132->u132_list);
u132_instances -= 1;
up(&u132_module_lock);
mutex_unlock(&u132_module_lock);
dev_warn(&u132->platform_dev->dev, "FREEING the hcd=%p and thus the u13"
"2=%p going=%d pdev=%p\n", hcd, u132, u132->going, pdev);
usb_put_hcd(hcd);
@ -3111,10 +3112,10 @@ static int __devinit u132_probe(struct platform_device *pdev)
int retval = 0;
struct u132 *u132 = hcd_to_u132(hcd);
hcd->rsrc_start = 0;
down(&u132_module_lock);
mutex_lock(&u132_module_lock);
list_add_tail(&u132->u132_list, &u132_static_list);
u132->sequence_num = ++u132_instances;
up(&u132_module_lock);
mutex_unlock(&u132_module_lock);
u132_u132_init_kref(u132);
u132_initialise(u132, pdev);
hcd->product_desc = "ELAN U132 Host Controller";
@ -3216,7 +3217,7 @@ static int __init u132_hcd_init(void)
INIT_LIST_HEAD(&u132_static_list);
u132_instances = 0;
u132_exiting = 0;
init_MUTEX(&u132_module_lock);
mutex_init(&u132_module_lock);
if (usb_disabled())
return -ENODEV;
printk(KERN_INFO "driver %s built at %s on %s\n", hcd_name, __TIME__,
@ -3232,9 +3233,9 @@ static void __exit u132_hcd_exit(void)
{
struct u132 *u132;
struct u132 *temp;
down(&u132_module_lock);
mutex_lock(&u132_module_lock);
u132_exiting += 1;
up(&u132_module_lock);
mutex_unlock(&u132_module_lock);
list_for_each_entry_safe(u132, temp, &u132_static_list, u132_list) {
platform_device_unregister(u132->platform_dev);
} platform_driver_unregister(&u132_platform_driver);