[PATCH] fs/ntfs3: remove unnecessary NULL check

[PATCH] fs/ntfs3: remove unnecessary NULL check

[Dan Carpenter]

This code triggers a Smatch warning:

    fs/ntfs3/fsntfs.c:1606 ntfs_bio_fill_1()
    warn: variable dereferenced before check 'bio' (see line 1591)

The "bio" pointer cannot be NULL so there is no need to check.
Originally there was more extensive NULL checking but it was removed
because bio_alloc() will never fail if it is allowed to sleep.

Remove this check as well.

Fixes: 087b2fb84908 ("ntfs3: remove ntfs_alloc_bio")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
This patch applies on top of Christoph's bio allocation series and needs
through the block tree, I think.  I included a Fixes tag even though
it's not really a bugfix...

 fs/ntfs3/fsntfs.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/fs/ntfs3/fsntfs.c b/fs/ntfs3/fsntfs.c
index 0660a07c5a96..3de5700a9b83 100644
--- a/fs/ntfs3/fsntfs.c
+++ b/fs/ntfs3/fsntfs.c
@@ -1603,11 +1603,10 @@ int ntfs_bio_fill_1(struct ntfs_sb_info *sbi, const struct runs_tree *run)
 		}
 	} while (run_get_entry(run, ++run_idx, NULL, &lcn, &clen));
 
-	if (bio) {
-		if (!err)
-			err = submit_bio_wait(bio);
-		bio_put(bio);
-	}
+	if (!err)
+		err = submit_bio_wait(bio);
+	bio_put(bio);
+
 	blk_finish_plug(&plug);
 out:
 	unlock_page(fill);
-- 
2.20.1

Re: [PATCH] fs/ntfs3: remove unnecessary NULL check

[Christoph Hellwig]

Looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH] fs/ntfs3: remove unnecessary NULL check

[Jens Axboe]

On Fri, 28 Jan 2022 17:09:22 +0300, Dan Carpenter wrote:
> This code triggers a Smatch warning:
> 
>     fs/ntfs3/fsntfs.c:1606 ntfs_bio_fill_1()
>     warn: variable dereferenced before check 'bio' (see line 1591)
> 
> The "bio" pointer cannot be NULL so there is no need to check.
> Originally there was more extensive NULL checking but it was removed
> because bio_alloc() will never fail if it is allowed to sleep.
> 
> [...]

Applied, thanks!

[1/1] fs/ntfs3: remove unnecessary NULL check
      commit: 365ab499153cdb2007d54e7e62bcbf2c67f7ab8f

Best regards,
-- 
Jens Axboe