Merge tag 'driver-core-5.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core and debugfs updates from Greg KH:
 "Here is the "big" driver core and debugfs changes for 5.3-rc1

  It's a lot of different patches, all across the tree due to some api
  changes and lots of debugfs cleanups.

  Other than the debugfs cleanups, in this set of changes we have:

   - bus iteration function cleanups

   - scripts/get_abi.pl tool to display and parse Documentation/ABI
     entries in a simple way

   - cleanups to Documenatation/ABI/ entries to make them parse easier
     due to typos and other minor things

   - default_attrs use for some ktype users

   - driver model documentation file conversions to .rst

   - compressed firmware file loading

   - deferred probe fixes

  All of these have been in linux-next for a while, with a bunch of
  merge issues that Stephen has been patient with me for"

* tag 'driver-core-5.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (102 commits)
  debugfs: make error message a bit more verbose
  orangefs: fix build warning from debugfs cleanup patch
  ubifs: fix build warning after debugfs cleanup patch
  driver: core: Allow subsystems to continue deferring probe
  drivers: base: cacheinfo: Ensure cpu hotplug work is done before Intel RDT
  arch_topology: Remove error messages on out-of-memory conditions
  lib: notifier-error-inject: no need to check return value of debugfs_create functions
  swiotlb: no need to check return value of debugfs_create functions
  ceph: no need to check return value of debugfs_create functions
  sunrpc: no need to check return value of debugfs_create functions
  ubifs: no need to check return value of debugfs_create functions
  orangefs: no need to check return value of debugfs_create functions
  nfsd: no need to check return value of debugfs_create functions
  lib: 842: no need to check return value of debugfs_create functions
  debugfs: provide pr_fmt() macro
  debugfs: log errors when something goes wrong
  drivers: s390/cio: Fix compilation warning about const qualifiers
  drivers: Add generic helper to match by of_node
  driver_find_device: Unify the match function with class_find_device()
  bus_find_device: Unify the match callback with class_find_device
  ...

net/ceph/ceph_common.c

@@ -776,9 +776,7 @@ static int __init init_ceph_lib(void)
 {
 	int ret = 0;
 
-	ret = ceph_debugfs_init();
-	if (ret < 0)
-		goto out;
+	ceph_debugfs_init();
 
 	ret = ceph_crypto_init();
 	if (ret < 0)
@@ -803,7 +801,6 @@ out_crypto:
 	ceph_crypto_shutdown();
 out_debugfs:
 	ceph_debugfs_cleanup();
-out:
 	return ret;
 }
 

net/ceph/debugfs.c

@@ -389,12 +389,9 @@ CEPH_DEFINE_SHOW_FUNC(monc_show)
 CEPH_DEFINE_SHOW_FUNC(osdc_show)
 CEPH_DEFINE_SHOW_FUNC(client_options_show)
 
-int __init ceph_debugfs_init(void)
+void __init ceph_debugfs_init(void)
 {
 	ceph_debugfs_dir = debugfs_create_dir("ceph", NULL);
-	if (!ceph_debugfs_dir)
-		return -ENOMEM;
-	return 0;
 }
 
 void ceph_debugfs_cleanup(void)
@@ -402,9 +399,8 @@ void ceph_debugfs_cleanup(void)
 	debugfs_remove(ceph_debugfs_dir);
 }
 
-int ceph_debugfs_client_init(struct ceph_client *client)
+void ceph_debugfs_client_init(struct ceph_client *client)
 {
-	int ret = -ENOMEM;
 	char name[80];
 
 	snprintf(name, sizeof(name), "%pU.client%lld", &client->fsid,
@@ -412,56 +408,37 @@ int ceph_debugfs_client_init(struct ceph_client *client)
 
 	dout("ceph_debugfs_client_init %p %s\n", client, name);
 
-	BUG_ON(client->debugfs_dir);
 	client->debugfs_dir = debugfs_create_dir(name, ceph_debugfs_dir);
-	if (!client->debugfs_dir)
-		goto out;
 
 	client->monc.debugfs_file = debugfs_create_file("monc",
 						      0400,
 						      client->debugfs_dir,
 						      client,
 						      &monc_show_fops);
-	if (!client->monc.debugfs_file)
-		goto out;
 
 	client->osdc.debugfs_file = debugfs_create_file("osdc",
 						      0400,
 						      client->debugfs_dir,
 						      client,
 						      &osdc_show_fops);
-	if (!client->osdc.debugfs_file)
-		goto out;
 
 	client->debugfs_monmap = debugfs_create_file("monmap",
 					0400,
 					client->debugfs_dir,
 					client,
 					&monmap_show_fops);
-	if (!client->debugfs_monmap)
-		goto out;
 
 	client->debugfs_osdmap = debugfs_create_file("osdmap",
 					0400,
 					client->debugfs_dir,
 					client,
 					&osdmap_show_fops);
-	if (!client->debugfs_osdmap)
-		goto out;
 
 	client->debugfs_options = debugfs_create_file("client_options",
 					0400,
 					client->debugfs_dir,
 					client,
 					&client_options_show_fops);
-	if (!client->debugfs_options)
-		goto out;
-
-	return 0;
-
-out:
-	ceph_debugfs_client_cleanup(client);
-	return ret;
 }
 
 void ceph_debugfs_client_cleanup(struct ceph_client *client)
@@ -477,18 +454,16 @@ void ceph_debugfs_client_cleanup(struct ceph_client *client)
 
 #else  /* CONFIG_DEBUG_FS */
 
-int __init ceph_debugfs_init(void)
+void __init ceph_debugfs_init(void)
 {
-	return 0;
 }
 
 void ceph_debugfs_cleanup(void)
 {
 }
 
-int ceph_debugfs_client_init(struct ceph_client *client)
+void ceph_debugfs_client_init(struct ceph_client *client)
 {
-	return 0;
 }
 
 void ceph_debugfs_client_cleanup(struct ceph_client *client)

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;
 
@@ -125,23 +124,16 @@ 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);
@@ -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);
 }