There were a two issues here.
1) We returned PTR_ERR(NULL) which means success if class_create()
failed.
2) If alloc_chrdev_region() failed then we should clean up before
returning.
Also kernel style is to have "error handling" as opposed to "success
handling". In the original code checking for "if (!status) " is
confusing and this bad style is what lead to bug #2.
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
diff --git a/drivers/usb/gadget/function/f_hid.c
b/drivers/usb/gadget/function/f_hid.c
index 220035f..cecdc75 100644
--- a/drivers/usb/gadget/function/f_hid.c
+++ b/drivers/usb/gadget/function/f_hid.c
@@ -972,17 +972,22 @@ int ghid_setup(struct usb_gadget *g, int count)
hidg_class = class_create(THIS_MODULE, "hidg");
if (IS_ERR(hidg_class)) {
+ status = PTR_ERR(hidg_class);
hidg_class = NULL;
- return PTR_ERR(hidg_class);
+ return status;
}
status = alloc_chrdev_region(&dev, 0, count, "hidg");
- if (!status) {
- major = MAJOR(dev);
- minors = count;
+ if (status) {
+ class_destroy(hidg_class);
+ hidg_class = NULL;
+ return status;
}
- return status;
+ major = MAJOR(dev);
+ minors = count;
+
+ return 0;
}
void ghid_cleanup(void)
--
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