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path: root/drivers/input/joystick/gamecon.c
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Diffstat (limited to 'drivers/input/joystick/gamecon.c')
-rw-r--r--drivers/input/joystick/gamecon.c19
1 files changed, 16 insertions, 3 deletions
diff --git a/drivers/input/joystick/gamecon.c b/drivers/input/joystick/gamecon.c
index 462fc38f026e..95bbdd302aad 100644
--- a/drivers/input/joystick/gamecon.c
+++ b/drivers/input/joystick/gamecon.c
@@ -81,6 +81,7 @@ struct gc {
struct timer_list timer;
unsigned char pads[GC_MAX + 1];
int used;
+ struct semaphore sem;
char phys[5][32];
};
@@ -503,22 +504,33 @@ static void gc_timer(unsigned long private)
static int gc_open(struct input_dev *dev)
{
struct gc *gc = dev->private;
+ int err;
+
+ err = down_interruptible(&gc->sem);
+ if (err)
+ return err;
+
if (!gc->used++) {
parport_claim(gc->pd);
parport_write_control(gc->pd->port, 0x04);
mod_timer(&gc->timer, jiffies + GC_REFRESH_TIME);
}
+
+ up(&gc->sem);
return 0;
}
static void gc_close(struct input_dev *dev)
{
struct gc *gc = dev->private;
+
+ down(&gc->sem);
if (!--gc->used) {
- del_timer(&gc->timer);
+ del_timer_sync(&gc->timer);
parport_write_control(gc->pd->port, 0x00);
parport_release(gc->pd);
}
+ up(&gc->sem);
}
static struct gc __init *gc_probe(int *config, int nargs)
@@ -542,11 +554,12 @@ static struct gc __init *gc_probe(int *config, int nargs)
return NULL;
}
- if (!(gc = kmalloc(sizeof(struct gc), GFP_KERNEL))) {
+ if (!(gc = kcalloc(1, sizeof(struct gc), GFP_KERNEL))) {
parport_put_port(pp);
return NULL;
}
- memset(gc, 0, sizeof(struct gc));
+
+ init_MUTEX(&gc->sem);
gc->pd = parport_register_device(pp, "gamecon", NULL, NULL, NULL, PARPORT_DEV_EXCL, NULL);