afs: Remove redundant assignment to ret

Variable ret is set to -ENOENT and -ENOMEM but this value is never
read as it is overwritten or not used later on, hence it is a
redundant assignment and can be removed.

Cleans up the following clang-analyzer warning:

fs/afs/dir.c:2014:4: warning: Value stored to 'ret' is never read
[clang-analyzer-deadcode.DeadStores].

fs/afs/dir.c:659:2: warning: Value stored to 'ret' is never read
[clang-analyzer-deadcode.DeadStores].

[DH made the following modifications:

 - In afs_rename(), -ENOMEM should be placed in op->error instead of ret,
   rather than the assignment being removed entirely.  afs_put_operation()
   will pick it up from there and return it.

 - If afs_sillyrename() fails, its error code should be placed in op->error
   rather than in ret also.
]

Fixes: e49c7b2f6de7 ("afs: Build an abstraction around an "operation" concept")
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Link: https://lore.kernel.org/r/1619691492-83866-1-git-send-email-jiapeng.chong@linux.alibaba.com
Link: https://lore.kernel.org/r/162609465444.3133237.7562832521724298900.stgit@warthog.procyon.org.uk/
Link: https://lore.kernel.org/r/162610729052.3408253.17364333638838151299.stgit@warthog.procyon.org.uk/

diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 78719f2..ac829e6 100644 (file)
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -656,7 +656,6 @@ static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry,
                return ret;
        }
 
-       ret = -ENOENT;
        if (!cookie.found) {
                _leave(" = -ENOENT [not found]");
                return -ENOENT;
@@ -2020,17 +2019,20 @@ static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
 
                if (d_count(new_dentry) > 2) {
                        /* copy the target dentry's name */
-                       ret = -ENOMEM;
                        op->rename.tmp = d_alloc(new_dentry->d_parent,
                                                 &new_dentry->d_name);
-                       if (!op->rename.tmp)
+                       if (!op->rename.tmp) {
+                               op->error = -ENOMEM;
                                goto error;
+                       }
 
                        ret = afs_sillyrename(new_dvnode,
                                              AFS_FS_I(d_inode(new_dentry)),
                                              new_dentry, op->key);
-                       if (ret)
+                       if (ret) {
+                               op->error = ret;
                                goto error;
+                       }
 
                        op->dentry_2 = op->rename.tmp;
                        op->rename.rehash = NULL;