linux-kernel - [PATCH 4/13] wimax/i2400m: make return of 0 explicit

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Message-Id: <1400473875-22228-5-git-send-email-Julia.Lawall@lip6.fr>
Date:	Mon, 19 May 2014 06:31:06 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Inaky Perez-Gonzalez <inaky.perez-gonzalez@...el.com>
Cc:	kernel-janitors@...r.kernel.org, linux-wimax@...el.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/13] wimax/i2400m: make return of 0 explicit

From: Julia Lawall <Julia.Lawall@...6.fr>

Delete unnecessary local variable whose value is always 0 and that hides
the fact that the result is always 0.

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

// <smpl>
@r exists@
local idexpression ret;
expression e;
position p;
@@

-ret = 0;
... when != ret = e
return 
- ret
+ 0
  ;
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
Alternatively, is an error code wanted under the if?

 drivers/net/wimax/i2400m/driver.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wimax/i2400m/driver.c b/drivers/net/wimax/i2400m/driver.c
index 9c34d2f..901a534 100644
--- a/drivers/net/wimax/i2400m/driver.c
+++ b/drivers/net/wimax/i2400m/driver.c
@@ -500,26 +500,23 @@ int i2400m_pm_notifier(struct notifier_block *notifier,
  */
 int i2400m_pre_reset(struct i2400m *i2400m)
 {
-	int result;
 	struct device *dev = i2400m_dev(i2400m);
 
 	d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
 	d_printf(1, dev, "pre-reset shut down\n");
 
-	result = 0;
 	mutex_lock(&i2400m->init_mutex);
 	if (i2400m->updown) {
 		netif_tx_disable(i2400m->wimax_dev.net_dev);
 		__i2400m_dev_stop(i2400m);
-		result = 0;
 		/* down't set updown to zero -- this way
 		 * post_reset can restore properly */
 	}
 	mutex_unlock(&i2400m->init_mutex);
 	if (i2400m->bus_release)
 		i2400m->bus_release(i2400m);
-	d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result);
-	return result;
+	d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, 0);
+	return 0;
 }
 EXPORT_SYMBOL_GPL(i2400m_pre_reset);
 

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