Messages in this thread Patch in this message | | | Date | Sun, 21 Dec 2008 16:40:56 +0100 (CET) | From | Julia Lawall <> | Subject | [PATCH 9/13] fs/xfs: Remove redundant test |
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From: Julia Lawall <julia@diku.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@diku.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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