Re: [PATCH v2 2/3] tools/virtiofsd/passthrough_ll: Remove unneeded variable assignment

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Philippe Mathieu-Daudé (philmd@redhat.com) wrote:
> Fix warning reported by Clang static code analyzer:
> 
>     CC      tools/virtiofsd/passthrough_ll.o
>   tools/virtiofsd/passthrough_ll.c:925:9: warning: Value stored to 'newfd' is never read
>           newfd = -1;
>           ^       ~~
>   tools/virtiofsd/passthrough_ll.c:942:9: warning: Value stored to 'newfd' is never read
>           newfd = -1;
>           ^       ~~
> 
> Fixes: 7c6b66027
> Reported-by: Clang Static Analyzer
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>

OK; actually one of those is in upstream, and another was added
by Miklos's 'virtiofsd: fail when parent inode isn't known in
lo_do_lookup()' - which kind of balances that if out.
I suspect the reason was because out_err: closes newfd if it's
not -1, so they were keeping it safe like that just in case another
error case gets added.

Dave

> ---
> v2: do not set newfd, use it (jtomko)
> ---
>  tools/virtiofsd/passthrough_ll.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
> index e9e71d5fc2..02ff01fad0 100644
> --- a/tools/virtiofsd/passthrough_ll.c
> +++ b/tools/virtiofsd/passthrough_ll.c
> @@ -922,7 +922,6 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
>      inode = lo_find(lo, &e->attr);
>      if (inode) {
>          close(newfd);
> -        newfd = -1;
>      } else {
>          inode = calloc(1, sizeof(struct lo_inode));
>          if (!inode) {
> @@ -939,7 +938,6 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
>  
>          inode->nlookup = 1;
>          inode->fd = newfd;
> -        newfd = -1;
>          inode->key.ino = e->attr.st_ino;
>          inode->key.dev = e->attr.st_dev;
>          pthread_mutex_init(&inode->plock_mutex, NULL);
> -- 
> 2.21.1
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK