Re: [PATCH 4/13] wimax/i2400m: make return of 0 explicit

From: Sergei Shtylyov
Date: Mon May 19 2014 - 08:46:56 EST


On 19-05-2014 8:31, Julia Lawall wrote:

From: Julia Lawall <Julia.Lawall@xxxxxxx>

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@xxxxxxx>

---
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);

Again, why not just "(i2400m %p) = 0\n"?

+ return 0;

WBR, Sergei

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