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authorLuiz Fernando Capitulino <lcapitulino@mandriva.com.br>2006-03-24 17:12:31 -0300
committerGreg Kroah-Hartman <gregkh@suse.de>2006-04-14 11:12:20 -0700
commit1ce7dd26e0f0e34bb75ec56f7f546151af34fcf9 (patch)
tree38635f09e5d02ef4cedba02fe1f8892cade6690b /drivers/usb/serial
parent14cd5f8e85e90c9dead2393377b9a2c23131e0ce (diff)
[PATCH] USB serial: Converts port semaphore to mutexes.
The usbserial's port semaphore used to synchronize serial_open() and serial_close() are strict mutexes, convert them to the mutex implementation. Signed-off-by: Luiz Capitulino <lcapitulino@mandriva.com.br> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/serial')
-rw-r--r--drivers/usb/serial/usb-serial.c16
-rw-r--r--drivers/usb/serial/usb-serial.h6
2 files changed, 11 insertions, 11 deletions
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 097f4e8488fe..071f86a59c08 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -27,10 +27,10 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/spinlock.h>
+#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/smp_lock.h>
#include <asm/uaccess.h>
-#include <asm/semaphore.h>
#include <linux/usb.h>
#include "usb-serial.h"
#include "pl2303.h"
@@ -192,7 +192,7 @@ static int serial_open (struct tty_struct *tty, struct file * filp)
if (!port)
return -ENODEV;
- if (down_interruptible(&port->sem))
+ if (mutex_lock_interruptible(&port->mutex))
return -ERESTARTSYS;
++port->open_count;
@@ -219,7 +219,7 @@ static int serial_open (struct tty_struct *tty, struct file * filp)
goto bailout_module_put;
}
- up(&port->sem);
+ mutex_unlock(&port->mutex);
return 0;
bailout_module_put:
@@ -227,7 +227,7 @@ bailout_module_put:
bailout_kref_put:
kref_put(&serial->kref, destroy_serial);
port->open_count = 0;
- up(&port->sem);
+ mutex_unlock(&port->mutex);
return retval;
}
@@ -240,10 +240,10 @@ static void serial_close(struct tty_struct *tty, struct file * filp)
dbg("%s - port %d", __FUNCTION__, port->number);
- down(&port->sem);
+ mutex_lock(&port->mutex);
if (port->open_count == 0) {
- up(&port->sem);
+ mutex_unlock(&port->mutex);
return;
}
@@ -262,7 +262,7 @@ static void serial_close(struct tty_struct *tty, struct file * filp)
module_put(port->serial->type->driver.owner);
}
- up(&port->sem);
+ mutex_unlock(&port->mutex);
kref_put(&port->serial->kref, destroy_serial);
}
@@ -783,7 +783,7 @@ int usb_serial_probe(struct usb_interface *interface,
port->number = i + serial->minor;
port->serial = serial;
spin_lock_init(&port->lock);
- sema_init(&port->sem, 1);
+ mutex_init(&port->mutex);
INIT_WORK(&port->work, usb_serial_port_softint, port);
serial->port[i] = port;
}
diff --git a/drivers/usb/serial/usb-serial.h b/drivers/usb/serial/usb-serial.h
index d7d27c3385b3..dc89d8710460 100644
--- a/drivers/usb/serial/usb-serial.h
+++ b/drivers/usb/serial/usb-serial.h
@@ -16,7 +16,7 @@
#include <linux/config.h>
#include <linux/kref.h>
-#include <asm/semaphore.h>
+#include <linux/mutex.h>
#define SERIAL_TTY_MAJOR 188 /* Nice legal number now */
#define SERIAL_TTY_MINORS 255 /* loads of devices :) */
@@ -31,7 +31,7 @@
* @serial: pointer back to the struct usb_serial owner of this port.
* @tty: pointer to the corresponding tty for this port.
* @lock: spinlock to grab when updating portions of this structure.
- * @sem: semaphore used to synchronize serial_open() and serial_close()
+ * @mutex: mutex used to synchronize serial_open() and serial_close()
* access for this port.
* @number: the number of the port (the minor number).
* @interrupt_in_buffer: pointer to the interrupt in buffer for this port.
@@ -63,7 +63,7 @@ struct usb_serial_port {
struct usb_serial * serial;
struct tty_struct * tty;
spinlock_t lock;
- struct semaphore sem;
+ struct mutex mutex;
unsigned char number;
unsigned char * interrupt_in_buffer;