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sunrpc: no need to check return value of debugfs_create functions

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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.

Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: Anna Schumaker <anna.schumaker@netapp.com>
Cc: linux-nfs@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20190612145622.GA18839@kroah.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2019-06-12 16:56:22 +02:00
parent 702d6a834b
commit 0a0762c6c6
1 changed files with 11 additions and 55 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

66
net/sunrpc/debugfs.c
View File

@ -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);
}