linux-kernel - [PATCH 2/16] drivers/infiniband/hw/cxgb4: Remove unnecessary error code assignment

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Date:	Mon, 16 Aug 2010 18:25:00 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Steve Wise <swise@...lsio.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 2/16] drivers/infiniband/hw/cxgb4: Remove unnecessary error
 code assignment

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

This code initializes ret to -ENOMEM, but actually ret is not used in the
code starting at err7, and -ENOMEM is always returned in this case, so the
initialization of ret is unnecessary.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
local idexpression x;
constant C;
@@

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

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

---
 drivers/infiniband/hw/cxgb4/qp.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/infiniband/hw/cxgb4/qp.c b/drivers/infiniband/hw/cxgb4/qp.c
index 93f6e5b..73e00ed 100644
--- a/drivers/infiniband/hw/cxgb4/qp.c
+++ b/drivers/infiniband/hw/cxgb4/qp.c
@@ -130,11 +130,9 @@ static int create_qp(struct c4iw_rdev *rdev, struct t4_wq *wq,
 	/* build fw_ri_res_wr */
 	wr_len = sizeof *res_wr + 2 * sizeof *res;
 
-	skb = alloc_skb(wr_len, GFP_KERNEL);
-	if (!skb) {
-		ret = -ENOMEM;
+	skb = alloc_skb(wr_len, GFP_KERNEL | __GFP_NOFAIL);
+	if (!skb)
 		goto err7;
-	}
 	set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0);
 
 	res_wr = (struct fw_ri_res_wr *)__skb_put(skb, wr_len);
--
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