linux-kernel - [PATCH 9/9] drivers/infiniband/hw/ehca: Drop unnecessary null test

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Date:	Tue, 3 Aug 2010 23:35:36 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Hoang-Nam Nguyen <hnguyen@...ibm.com>,
	Christoph Raisch <raisch@...ibm.com>,
	Roland Dreier <rolandd@...co.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH 9/9] drivers/infiniband/hw/ehca: Drop unnecessary null test

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

list_for_each_entry binds its first argument to a non-null value, and thus
any null test on the value of that argument is superfluous.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
iterator I;
expression x;
statement S,S1,S2;
@@

I(x,...) { <...
- if (x == NULL && ...) S
  ...> }
// </smpl>

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

---
 drivers/infiniband/hw/ehca/ehca_mrmw.c |    5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/infiniband/hw/ehca/ehca_mrmw.c b/drivers/infiniband/hw/ehca/ehca_mrmw.c
index 31a68b9..53f4cd4 100644
--- a/drivers/infiniband/hw/ehca/ehca_mrmw.c
+++ b/drivers/infiniband/hw/ehca/ehca_mrmw.c
@@ -933,11 +933,6 @@ int ehca_unmap_fmr(struct list_head *fmr_list)
 	/* check all FMR belong to same SHCA, and check internal flag */
 	list_for_each_entry(ib_fmr, fmr_list, list) {
 		prev_shca = shca;
-		if (!ib_fmr) {
-			ehca_gen_err("bad fmr=%p in list", ib_fmr);
-			ret = -EINVAL;
-			goto unmap_fmr_exit0;
-		}
 		shca = container_of(ib_fmr->device, struct ehca_shca,
 				    ib_device);
 		e_fmr = container_of(ib_fmr, struct ehca_mr, ib.ib_fmr);
--
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