linux-kernel - [PATCH] smb: client: Reduce the scopes for a few variables in two functions

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Message-ID: <468cf96a-5dd9-4aa5-a8ce-930cf16952b3@web.de>
Date: Sun, 5 Oct 2025 19:10:13 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Henrique Carvalho <henrique.carvalho@...e.com>,
 linux-cifs@...r.kernel.org, samba-technical@...ts.samba.org,
 Bharath SM <bharathsm@...rosoft.com>, Paulo Alcantara <pc@...guebit.org>,
 Ronnie Sahlberg <ronniesahlberg@...il.com>,
 Shyam Prasad N <sprasad@...rosoft.com>, Steve French
 <stfrench@...rosoft.com>, Tom Talpey <tom@...pey.com>
Cc: LKML <linux-kernel@...r.kernel.org>, kernel-janitors@...r.kernel.org
Subject: [PATCH] smb: client: Reduce the scopes for a few variables in two
 functions

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sun, 5 Oct 2025 19:01:48 +0200

* cifs_lookup():
  Move the definition for the local variable “cfid” into an else branch
  so that the corresponding setting will only be performed if a NULL inode
  was detected during lookup by this function.

* cifs_d_revalidate():
  Move the definition for the local variables “inode” and “rc” into
  an if branch so that the corresponding setting will only be performed
  after a d_really_is_positive() call.

  Move the definition for the local variable “cfid” into an else branch
  so that the corresponding setting will only be performed if further data
  processing will be needed for an open_cached_dir_by_dentry() call.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 fs/smb/client/dir.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/smb/client/dir.c b/fs/smb/client/dir.c
index fc67a6441c96..7472fddadd4f 100644
--- a/fs/smb/client/dir.c
+++ b/fs/smb/client/dir.c
@@ -678,7 +678,6 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 	const char *full_path;
 	void *page;
 	int retry_count = 0;
-	struct cached_fid *cfid = NULL;
 
 	xid = get_xid();
 
@@ -717,6 +716,8 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 	if (d_really_is_positive(direntry)) {
 		cifs_dbg(FYI, "non-NULL inode in lookup\n");
 	} else {
+		struct cached_fid *cfid = NULL;
+
 		cifs_dbg(FYI, "NULL inode in lookup\n");
 
 		/*
@@ -785,15 +786,13 @@ static int
 cifs_d_revalidate(struct inode *dir, const struct qstr *name,
 		  struct dentry *direntry, unsigned int flags)
 {
-	struct inode *inode = NULL;
-	struct cached_fid *cfid;
-	int rc;
-
 	if (flags & LOOKUP_RCU)
 		return -ECHILD;
 
 	if (d_really_is_positive(direntry)) {
-		inode = d_inode(direntry);
+		int rc;
+		struct inode *inode = d_inode(direntry);
+
 		if ((flags & LOOKUP_REVAL) && !CIFS_CACHE_READ(CIFS_I(inode)))
 			CIFS_I(inode)->time = 0; /* force reval */
 
@@ -836,6 +835,7 @@ cifs_d_revalidate(struct inode *dir, const struct qstr *name,
 	} else {
 		struct cifs_sb_info *cifs_sb = CIFS_SB(dir->i_sb);
 		struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
+		struct cached_fid *cfid;
 
 		if (!open_cached_dir_by_dentry(tcon, direntry->d_parent, &cfid)) {
 			/*
-- 
2.51.0