linux-kernel - [PATCH 5/12] drivers/parisc: Correct redundant test

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Date:	Mon, 27 Jul 2009 18:13:48 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	kyle@...artin.ca, deller@....de, linux-parisc@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 5/12] drivers/parisc: Correct redundant test

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

pa_pdc_cell has already been tested.  It seems that this test should be on the
recently returned value io_pdc_cell.

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

// <smpl>
@r exists@
local idexpression x;
expression E;
@@

if (x == NULL || ...) { ... when forall
   return ...; }
... when != \(x=E\|x--\|x++\|--x\|++x\|x-=E\|x+=E\|x|=E\|x&=E\|&x\)
(
*x == NULL
|
*x != NULL
)
// </smpl>

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

---
 drivers/parisc/lba_pci.c            |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/parisc/lba_pci.c b/drivers/parisc/lba_pci.c
index ede6146..3aeb327 100644
--- a/drivers/parisc/lba_pci.c
+++ b/drivers/parisc/lba_pci.c
@@ -992,7 +992,7 @@ lba_pat_resources(struct parisc_device *pa_dev, struct lba_device *lba_dev)
 		return;
 
 	io_pdc_cell = kzalloc(sizeof(pdc_pat_cell_mod_maddr_block_t), GFP_KERNEL);
-	if (!pa_pdc_cell) {
+	if (!io_pdc_cell) {
 		kfree(pa_pdc_cell);
 		return;
 	}
--
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