linux-kernel - Re: [PATCH] ntfs: Deletion of unnecessary checks before the function call "iput"

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Message-Id: <20150706145013.13e231ec1dc51ac0d9137732@linux-foundation.org>
Date:	Mon, 6 Jul 2015 14:50:13 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Anton Altaparmakov <anton@...era.com>
Cc:	"linux-ntfs-dev@...ts.sourceforge.net" 
	<linux-ntfs-dev@...ts.sourceforge.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
	Julia Lawall <julia.lawall@...6.fr>,
	"SF Markus Elfring" <elfring@...rs.sourceforge.net>
Subject: Re: [PATCH] ntfs: Deletion of unnecessary checks before the
 function call "iput"

On Sat, 4 Jul 2015 10:36:57 +0000 Anton Altaparmakov <anton@...era.com> wrote:

> Hi Andrew,
> 
> Can you please take up this trivial patch and merge it upstream?
> 
> Reviewed-by: Anton Altaparmakov <anton@...era.com>
> 

Nobody responded to Julia's review comment: "I don't have time to look
at the code now, but since there is an exit label here, have you
checked whether you could improve the gotos in these cases?"

She has a good point.  We can either change those gotos to go to the
correct place (current code is rather bizarre) or we can simply do

--- a/fs/ntfs/super.c~a
+++ a/fs/ntfs/super.c
@@ -2202,36 +2202,26 @@ get_ctx_vol_failed:
 	}
 #endif /* NTFS_RW */
 	return true;
+out:
 #ifdef NTFS_RW
-iput_usnjrnl_err_out:
 	iput(vol->usnjrnl_j_ino);
 	iput(vol->usnjrnl_max_ino);
 	iput(vol->usnjrnl_ino);
-iput_quota_err_out:
 	iput(vol->quota_q_ino);
 	iput(vol->quota_ino);
 	iput(vol->extend_ino);
 #endif /* NTFS_RW */
-iput_sec_err_out:
 	iput(vol->secure_ino);
-iput_root_err_out:
 	iput(vol->root_ino);
-iput_logfile_err_out:
 #ifdef NTFS_RW
 	iput(vol->logfile_ino);
-iput_vol_err_out:
 #endif /* NTFS_RW */
 	iput(vol->vol_ino);
-iput_lcnbmp_err_out:
 	iput(vol->lcnbmp_ino);
-iput_attrdef_err_out:
 	vol->attrdef_size = 0;
-	if (vol->attrdef) {
-		ntfs_free(vol->attrdef);
-		vol->attrdef = NULL;
-	}
+	ntfs_free(vol->attrdef);
+	vol->attrdef = NULL;
 #ifdef NTFS_RW
-iput_upcase_err_out:
 #endif /* NTFS_RW */
 	vol->upcase_len = 0;
 	mutex_lock(&ntfs_lock);
@@ -2246,7 +2236,6 @@ iput_upcase_err_out:
 	}
 iput_mftbmp_err_out:
 	iput(vol->mftbmp_ino);
-iput_mirr_err_out:
 #ifdef NTFS_RW
 	iput(vol->mftmirr_ino);
 #endif /* NTFS_RW */

(note that ntfs_free(NULL) is OK)

then change all the appropriate gotos to good old "goto out;".

Or we can not bother ;)
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