USB: ohci: no need to check return value of debugfs_create functions

When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

There is also no need to keep the file dentries around at all, so remove
those variables from the host controller structure.

Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ohci-dbg.c

@@ -762,50 +762,23 @@ static int debug_registers_open(struct inode *inode, struct file *file)
 static inline void create_debug_files (struct ohci_hcd *ohci)
 {
 	struct usb_bus *bus = &ohci_to_hcd(ohci)->self;
+	struct dentry *root;
 
-	ohci->debug_dir = debugfs_create_dir(bus->bus_name, ohci_debug_root);
-	if (!ohci->debug_dir)
-		goto dir_error;
+	root = debugfs_create_dir(bus->bus_name, ohci_debug_root);
+	ohci->debug_dir = root;
 
-	ohci->debug_async = debugfs_create_file("async", S_IRUGO,
-						ohci->debug_dir, ohci,
-						&debug_async_fops);
-	if (!ohci->debug_async)
-		goto async_error;
-
-	ohci->debug_periodic = debugfs_create_file("periodic", S_IRUGO,
-						   ohci->debug_dir, ohci,
-						   &debug_periodic_fops);
-	if (!ohci->debug_periodic)
-		goto periodic_error;
-
-	ohci->debug_registers = debugfs_create_file("registers", S_IRUGO,
-						    ohci->debug_dir, ohci,
-						    &debug_registers_fops);
-	if (!ohci->debug_registers)
-		goto registers_error;
+	debugfs_create_file("async", S_IRUGO, root, ohci, &debug_async_fops);
+	debugfs_create_file("periodic", S_IRUGO, root, ohci,
+			    &debug_periodic_fops);
+	debugfs_create_file("registers", S_IRUGO, root, ohci,
+			    &debug_registers_fops);
 
 	ohci_dbg (ohci, "created debug files\n");
-	return;
-
-registers_error:
-	debugfs_remove(ohci->debug_periodic);
-periodic_error:
-	debugfs_remove(ohci->debug_async);
-async_error:
-	debugfs_remove(ohci->debug_dir);
-dir_error:
-	ohci->debug_periodic = NULL;
-	ohci->debug_async = NULL;
-	ohci->debug_dir = NULL;
 }
 
 static inline void remove_debug_files (struct ohci_hcd *ohci)
 {
-	debugfs_remove(ohci->debug_registers);
-	debugfs_remove(ohci->debug_periodic);
-	debugfs_remove(ohci->debug_async);
-	debugfs_remove(ohci->debug_dir);
+	debugfs_remove_recursive(ohci->debug_dir);
 }
 
 /*-------------------------------------------------------------------------*/

drivers/usb/host/ohci-hcd.c

@@ -1258,10 +1258,6 @@ static int __init ohci_hcd_mod_init(void)
 	set_bit(USB_OHCI_LOADED, &usb_hcds_loaded);
 
 	ohci_debug_root = debugfs_create_dir("ohci", usb_debug_root);
-	if (!ohci_debug_root) {
-		retval = -ENOENT;
-		goto error_debug;
-	}
 
 #ifdef PS3_SYSTEM_BUS_DRIVER
 	retval = ps3_ohci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
@@ -1318,7 +1314,6 @@ static int __init ohci_hcd_mod_init(void)
 #endif
 	debugfs_remove(ohci_debug_root);
 	ohci_debug_root = NULL;
- error_debug:
 
 	clear_bit(USB_OHCI_LOADED, &usb_hcds_loaded);
 	return retval;

drivers/usb/host/ohci.h

@@ -431,9 +431,6 @@ struct ohci_hcd {
 	struct work_struct	nec_work;	/* Worker for NEC quirk */
 
 	struct dentry		*debug_dir;
-	struct dentry		*debug_async;
-	struct dentry		*debug_periodic;
-	struct dentry		*debug_registers;
 
 	/* platform-specific data -- must come last */
 	unsigned long           priv[0] __aligned(sizeof(s64));