From a941fc3957113df977e7396c2cf1679e87a65555 Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Tue, 29 May 2018 17:30:46 +0200
Subject: [PATCH] USB: typec: tcpm: no need to check return value of
 debugfs_create_dir()
Git-commit: a941fc3957113df977e7396c2cf1679e87a65555
References: FATE#326325
Patch-mainline: v4.18

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.

Clean up the tcpm.c code to not care about this, turns out no one was
even checking the return value of this function, so it didn't matter.

Note, I do not think this code can be removed in a running system, as
the debugfs root directory will stick around, that should be fixed
someday...

Revieved-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
 drivers/usb/typec/tcpm.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/typec/tcpm.c b/drivers/usb/typec/tcpm.c
index 0ccd2ce1eb59..8a201dd53d36 100644
--- a/drivers/usb/typec/tcpm.c
+++ b/drivers/usb/typec/tcpm.c
@@ -566,21 +566,16 @@ DEFINE_SHOW_ATTRIBUTE(tcpm_debug);
 
 static struct dentry *rootdir;
 
-static int tcpm_debugfs_init(struct tcpm_port *port)
+static void tcpm_debugfs_init(struct tcpm_port *port)
 {
 	mutex_init(&port->logbuffer_lock);
 	/* /sys/kernel/debug/tcpm/usbcX */
-	if (!rootdir) {
+	if (!rootdir)
 		rootdir = debugfs_create_dir("tcpm", NULL);
-		if (!rootdir)
-			return -ENOMEM;
-	}
 
 	port->dentry = debugfs_create_file(dev_name(port->dev),
 					   S_IFREG | 0444, rootdir,
 					   port, &tcpm_debug_fops);
-
-	return 0;
 }
 
 static void tcpm_debugfs_exit(struct tcpm_port *port)
@@ -595,7 +590,7 @@ static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
 __printf(2, 3)
 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { }
 static void tcpm_log_source_caps(struct tcpm_port *port) { }
-static int tcpm_debugfs_init(const struct tcpm_port *port) { return 0; }
+static void tcpm_debugfs_init(const struct tcpm_port *port) { }
 static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
 
 #endif
-- 
2.16.4