linux-kernel - [PATCH 9/13] fs/xfs: Remove redundant test

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Message-ID: <Pine.LNX.4.64.0812211640360.9555@pc-004.diku.dk>
Date:	Sun, 21 Dec 2008 16:40:56 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	xfs-masters@....sgi.com, xfs@....sgi.com,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 9/13] fs/xfs: Remove redundant test

From: Julia Lawall <julia@...u.dk>

In fs/cifs/cifssmb.c, pLockData is tested for being NULL at the beginning
of the function, and not reassigned subsequently.

In fs/xfs/xfs_trans_buf.c, bp is tested for being NULL just a few lines
above.

A simplified version of the semantic patch that makes this change is as
follows: (http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r exists@
local idexpression x;
expression E;
position p1,p2;
@@

if (x@p1 == NULL || ...) { ... when forall
   return ...; }
... when != \(x=E\|x--\|x++\|--x\|++x\|x-=E\|x+=E\|x|=E\|x&=E\|&x\)
(
x@p2 == NULL
|
x@p2 != NULL
)

// another path to the test that is not through p1?
@s exists@
local idexpression r.x;
position r.p1,r.p2;
@@

... when != x@p1
(
x@p2 == NULL
|
x@p2 != NULL
)

@fix depends on !s@
position r.p1,r.p2;
expression x,E;
statement S1,S2;
@@

(
- if ((x@p2 != NULL) || ...)
  S1
|
- if ((x@p2 == NULL) && ...) S1
|
- BUG_ON(x@p2 == NULL);
)
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 fs/xfs/xfs_trans_buf.c              |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/xfs/xfs_trans_buf.c b/fs/xfs/xfs_trans_buf.c
index 8ee2f8c..22afe29 100644
--- a/fs/xfs/xfs_trans_buf.c
+++ b/fs/xfs/xfs_trans_buf.c
@@ -307,7 +307,7 @@ xfs_trans_read_buf(
 			return (flags & XFS_BUF_TRYLOCK) ?
 					EAGAIN : XFS_ERROR(ENOMEM);
 
-		if ((bp != NULL) && (XFS_BUF_GETERROR(bp) != 0)) {
+		if (XFS_BUF_GETERROR(bp) != 0) {
 			xfs_ioerror_alert("xfs_trans_read_buf", mp,
 					  bp, blkno);
 			error = XFS_BUF_GETERROR(bp);
--
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