@@ -474,6 +474,18 @@ out:
return cdev;
}
+struct cdev *lookup_cdev(const char *pathname)
+{
+ struct cdev *cdev;
+ int error;
+
+ error = __lookup_dev(pathname, &cdev, NULL);
+ if (error)
+ return ERR_PTR(error);
+
+ return cdev;
+}
+
/**
* cdev_add() - add a char device to the system
* @p: the cdev structure for the device
@@ -596,6 +608,7 @@ void __init chrdev_init(void)
EXPORT_SYMBOL(register_chrdev_region);
EXPORT_SYMBOL(unregister_chrdev_region);
EXPORT_SYMBOL(alloc_chrdev_region);
+EXPORT_SYMBOL(lookup_cdev);
EXPORT_SYMBOL(cdev_init);
EXPORT_SYMBOL(cdev_alloc);
EXPORT_SYMBOL(cdev_del);
@@ -2346,6 +2346,8 @@ extern void __unregister_chrdev(unsigned int major, unsigned int baseminor,
unsigned int count, const char *name);
extern void unregister_chrdev_region(dev_t, unsigned);
extern void chrdev_show(struct seq_file *,off_t);
+extern struct cdev *lookup_cdev(const char *);
+
static inline int register_chrdev(unsigned int major, const char *name,
const struct file_operations *fops)