On Mon, Jul 12, 2021 at 9:57 AM David Howells <dhowells@xxxxxxxxxx> wrote:
>
> From: Jiapeng Chong <jiapeng.chong@xxxxxxxxxxxxxxxxx>
>
> 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@xxxxxxxxxxxxxxxxx>
> Signed-off-by: Jiapeng Chong <jiapeng.chong@xxxxxxxxxxxxxxxxx>
> Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
> cc: linux-afs@xxxxxxxxxxxxxxxxxxx
> Link: https://lore.kernel.org/r/1619691492-83866-1-git-send-email-jiapeng.chong@xxxxxxxxxxxxxxxxx
> ---
>
> fs/afs/dir.c | 10 ++++++----
> 1 file changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/fs/afs/dir.c b/fs/afs/dir.c
> index 78719f2f567e..ac829e63c570 100644
> --- 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;
>
>
>
> _______________________________________________
> linux-afs mailing list
> http://lists.infradead.org/mailman/listinfo/linux-afs
Reviewed-by: Marc Dionne <marc.dionne@xxxxxxxxxxxx>
Marc
