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 <[email protected]>
---
drivers/usb/serial/usb-serial.c | 16 ++++++++--------
drivers/usb/serial/usb-serial.h | 6 +++---
2 files changed, 11 insertions(+), 11 deletions(-)
56a513093e0de2e058d1ddecb4c36ff05c1c4f1a
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 097f4e8..071f86a 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_struc
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_struc
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_stru
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_stru
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_interfac
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 d7d27c3..dc89d87 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;
--
1.2.4
--
Luiz Fernando N. Capitulino