1 files changed, 13 insertions, 4 deletions

diff --git a/drivers/input/joystick/db9.c b/drivers/input/joystick/db9.c
index cfdd3acf06a1..fbd3eed07f90 100644
--- a/drivers/input/joystick/db9.c
+++ b/drivers/input/joystick/db9.c
@@ -87,7 +87,7 @@ __obsolete_setup("db9_3=");
 #define DB9_NORMAL              0x0a
 #define DB9_NOSELECT            0x08
 
-#define DB9_MAX_DEVICES 2
+#define DB9_MAX_DEVICES         2
 
 #define DB9_GENESIS6_DELAY      14
 #define DB9_REFRESH_TIME        HZ/100
@@ -98,6 +98,7 @@ struct db9 {
         struct pardevice *pd;
         int mode;
         int used;
+        struct semaphore sem;
         char phys[2][32];
 };
 
@@ -503,6 +504,11 @@ static int db9_open(struct input_dev *dev)
 {
         struct db9 *db9 = dev->private;
         struct parport *port = db9->pd->port;
+        int err;
+
+        err = down_interruptible(&db9->sem);
+        if (err)
+                return err;
 
         if (!db9->used++) {
                 parport_claim(db9->pd);
@@ -514,6 +520,7 @@ static int db9_open(struct input_dev *dev)
                 mod_timer(&db9->timer, jiffies + DB9_REFRESH_TIME);
         }
 
+        up(&db9->sem);
         return 0;
 }
 
@@ -522,12 +529,14 @@ static void db9_close(struct input_dev *dev)
         struct db9 *db9 = dev->private;
         struct parport *port = db9->pd->port;
 
+        down(&db9->sem);
         if (!--db9->used) {
-                del_timer(&db9->timer);
+                del_timer_sync(&db9->timer);
                 parport_write_control(port, 0x00);
                 parport_data_forward(port);
                 parport_release(db9->pd);
         }
+        up(&db9->sem);
 }
 
 static struct db9 __init *db9_probe(int *config, int nargs)
@@ -563,12 +572,12 @@ static struct db9 __init *db9_probe(int *config, int nargs)
                 }
         }
 
-        if (!(db9 = kmalloc(sizeof(struct db9), GFP_KERNEL))) {
+        if (!(db9 = kcalloc(1, sizeof(struct db9), GFP_KERNEL))) {
                 parport_put_port(pp);
                 return NULL;
         }
-        memset(db9, 0, sizeof(struct db9));
 
+        init_MUTEX(&db9->sem);
         db9->mode = config[1];
         init_timer(&db9->timer);
         db9->timer.data = (long) db9;