[PATCH] sunrpc: no need to check return value of debugfs_create functions

[Greg Kroah-Hartman]

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.

Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 net/sunrpc/debugfs.c | 68 ++++++++------------------------------------
 1 file changed, 12 insertions(+), 56 deletions(-)

diff --git a/net/sunrpc/debugfs.c b/net/sunrpc/debugfs.c
index 45a033329cd4..c7ad5772f5d9 100644
--- a/net/sunrpc/debugfs.c
+++ b/net/sunrpc/debugfs.c
@@ -11,7 +11,6 @@
 #include "netns.h"
 
 static struct dentry *topdir;
-static struct dentry *rpc_fault_dir;
 static struct dentry *rpc_clnt_dir;
 static struct dentry *rpc_xprt_dir;
 
@@ -125,28 +124,21 @@ rpc_clnt_debugfs_register(struct rpc_clnt *clnt)
 	char name[24]; /* enough for "../../rpc_xprt/ + 8 hex digits + NULL */
 	struct rpc_xprt *xprt;
 
-	/* Already registered? */
-	if (clnt->cl_debugfs || !rpc_clnt_dir)
-		return;
-
 	len = snprintf(name, sizeof(name), "%x", clnt->cl_clid);
 	if (len >= sizeof(name))
 		return;
 
 	/* make the per-client dir */
 	clnt->cl_debugfs = debugfs_create_dir(name, rpc_clnt_dir);
-	if (!clnt->cl_debugfs)
-		return;
 
 	/* make tasks file */
-	if (!debugfs_create_file("tasks", S_IFREG | 0400, clnt->cl_debugfs,
-				 clnt, &tasks_fops))
-		goto out_err;
+	debugfs_create_file("tasks", S_IFREG | 0400, clnt->cl_debugfs, clnt,
+			    &tasks_fops);
 
 	rcu_read_lock();
 	xprt = rcu_dereference(clnt->cl_xprt);
 	/* no "debugfs" dentry? Don't bother with the symlink. */
-	if (!xprt->debugfs) {
+	if (IS_ERR_OR_NULL(xprt->debugfs)) {
 		rcu_read_unlock();
 		return;
 	}
@@ -157,8 +149,7 @@ rpc_clnt_debugfs_register(struct rpc_clnt *clnt)
 	if (len >= sizeof(name))
 		goto out_err;
 
-	if (!debugfs_create_symlink("xprt", clnt->cl_debugfs, name))
-		goto out_err;
+	debugfs_create_symlink("xprt", clnt->cl_debugfs, name);
 
 	return;
 out_err:
@@ -226,9 +217,6 @@ rpc_xprt_debugfs_register(struct rpc_xprt *xprt)
 	static atomic_t	cur_id;
 	char		name[9]; /* 8 hex digits + NULL term */
 
-	if (!rpc_xprt_dir)
-		return;
-
 	id = (unsigned int)atomic_inc_return(&cur_id);
 
 	len = snprintf(name, sizeof(name), "%x", id);
@@ -237,15 +225,10 @@ rpc_xprt_debugfs_register(struct rpc_xprt *xprt)
 
 	/* make the per-client dir */
 	xprt->debugfs = debugfs_create_dir(name, rpc_xprt_dir);
-	if (!xprt->debugfs)
-		return;
 
 	/* make tasks file */
-	if (!debugfs_create_file("info", S_IFREG | 0400, xprt->debugfs,
-				 xprt, &xprt_info_fops)) {
-		debugfs_remove_recursive(xprt->debugfs);
-		xprt->debugfs = NULL;
-	}
+	debugfs_create_file("info", S_IFREG | 0400, xprt->debugfs, xprt,
+			    &xprt_info_fops);
 
 	atomic_set(&xprt->inject_disconnect, rpc_inject_disconnect);
 }
@@ -308,28 +291,11 @@ static const struct file_operations fault_disconnect_fops = {
 	.release	= fault_release,
 };
 
-static struct dentry *
-inject_fault_dir(struct dentry *topdir)
-{
-	struct dentry *faultdir;
-
-	faultdir = debugfs_create_dir("inject_fault", topdir);
-	if (!faultdir)
-		return NULL;
-
-	if (!debugfs_create_file("disconnect", S_IFREG | 0400, faultdir,
-				 NULL, &fault_disconnect_fops))
-		return NULL;
-
-	return faultdir;
-}
-
 void __exit
 sunrpc_debugfs_exit(void)
 {
 	debugfs_remove_recursive(topdir);
 	topdir = NULL;
-	rpc_fault_dir = NULL;
 	rpc_clnt_dir = NULL;
 	rpc_xprt_dir = NULL;
 }
@@ -337,26 +303,16 @@ sunrpc_debugfs_exit(void)
 void __init
 sunrpc_debugfs_init(void)
 {
-	topdir = debugfs_create_dir("sunrpc", NULL);
-	if (!topdir)
-		return;
+	struct dentry *rpc_fault_dir;
 
-	rpc_fault_dir = inject_fault_dir(topdir);
-	if (!rpc_fault_dir)
-		goto out_remove;
+	topdir = debugfs_create_dir("sunrpc", NULL);
 
 	rpc_clnt_dir = debugfs_create_dir("rpc_clnt", topdir);
-	if (!rpc_clnt_dir)
-		goto out_remove;
 
 	rpc_xprt_dir = debugfs_create_dir("rpc_xprt", topdir);
-	if (!rpc_xprt_dir)
-		goto out_remove;
 
-	return;
-out_remove:
-	debugfs_remove_recursive(topdir);
-	topdir = NULL;
-	rpc_fault_dir = NULL;
-	rpc_clnt_dir = NULL;
+	rpc_fault_dir = debugfs_create_dir("inject_fault", topdir);
+
+	debugfs_create_file("disconnect", S_IFREG | 0400, rpc_fault_dir, NULL,
+			    &fault_disconnect_fops);
 }
-- 
2.20.1