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path: root/drivers/char/ppdev.c
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Diffstat (limited to 'drivers/char/ppdev.c')
-rw-r--r--drivers/char/ppdev.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/char/ppdev.c b/drivers/char/ppdev.c
index 2a558c706581..3e73bcdf9e65 100644
--- a/drivers/char/ppdev.c
+++ b/drivers/char/ppdev.c
@@ -84,11 +84,14 @@ struct pp_struct {
struct ieee1284_info state;
struct ieee1284_info saved_state;
long default_inactivity;
+ int index;
};
/* should we use PARDEVICE_MAX here? */
static struct device *devices[PARPORT_MAX];
+static DEFINE_IDA(ida_index);
+
/* pp_struct.flags bitfields */
#define PP_CLAIMED (1<<0)
#define PP_EXCL (1<<1)
@@ -290,7 +293,7 @@ static int register_device(int minor, struct pp_struct *pp)
struct pardevice *pdev = NULL;
char *name;
struct pardev_cb ppdev_cb;
- int rc = 0;
+ int rc = 0, index;
name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor);
if (name == NULL)
@@ -303,20 +306,23 @@ static int register_device(int minor, struct pp_struct *pp)
goto err;
}
+ index = ida_simple_get(&ida_index, 0, 0, GFP_KERNEL);
memset(&ppdev_cb, 0, sizeof(ppdev_cb));
ppdev_cb.irq_func = pp_irq;
ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0;
ppdev_cb.private = pp;
- pdev = parport_register_dev_model(port, name, &ppdev_cb, minor);
+ pdev = parport_register_dev_model(port, name, &ppdev_cb, index);
parport_put_port(port);
if (!pdev) {
pr_warn("%s: failed to register device!\n", name);
rc = -ENXIO;
+ ida_simple_remove(&ida_index, index);
goto err;
}
pp->pdev = pdev;
+ pp->index = index;
dev_dbg(&pdev->dev, "registered pardevice\n");
err:
kfree(name);
@@ -755,6 +761,7 @@ static int pp_release(struct inode *inode, struct file *file)
if (pp->pdev) {
parport_unregister_device(pp->pdev);
+ ida_simple_remove(&ida_index, pp->index);
pp->pdev = NULL;
pr_debug(CHRDEV "%x: unregistered pardevice\n", minor);
}