linux-kernel - [PATCH 5/11] drivers/block/drbd: Correct NULL test

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Date:	Sat, 6 Feb 2010 09:43:21 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	Lars Ellenberg <drbd-dev@...ts.linbit.com>,
	drbd-user@...ts.linbit.com, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH 5/11] drivers/block/drbd: Correct NULL test

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

Test the value that was just allocated rather than the previously tested one.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@r@
expression *x;
expression e;
identifier l;
@@

if (x == NULL || ...) {
    ... when forall
    return ...; }
... when != goto l;
    when != x = e
    when != &x
*x == NULL
// </smpl>

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

---
 drivers/block/drbd/drbd_main.c      |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index ab871e0..d0c38a6 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2770,7 +2770,7 @@ static int drbd_create_mempools(void)
 
 	drbd_ee_mempool = mempool_create(number,
 		mempool_alloc_slab, mempool_free_slab, drbd_ee_cache);
-	if (drbd_request_mempool == NULL)
+	if (drbd_ee_mempool == NULL)
 		goto Enomem;
 
 	/* drbd's page pool */
--
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