[PATCH 5/13] usb: gadget: make return of 0 explicit

Julia Lawall
2014-05-19T04:36:01Z

From: Julia Lawall <Julia.Lawall@lip6.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@lip6.fr>

---
drivers/usb/gadget/composite.c | 6 ++----
drivers/usb/gadget/dummy_hcd.c | 4 +---
2 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 042c66b..f801519 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -1312,9 +1312,7 @@ static void fill_ext_compat(struct usb_configuration *c, u8 *buf)
static int count_ext_prop(struct usb_configuration *c, int interface)
{
struct usb_function *f;
- int j, res;
-
- res = 0;
+ int j;

f = c->interface[interface];
for (j = 0; j < f->os_desc_n; ++j) {
@@ -1326,7 +1324,7 @@ static int count_ext_prop(struct usb_configuration *c, int interface)
if (d && d->ext_compat_id)
return d->ext_prop_count;
}
- return res;
+ return 0;
}

static int len_ext_prop(struct usb_configuration *c, int interface)
diff --git a/drivers/usb/gadget/dummy_hcd.c b/drivers/usb/gadget/dummy_hcd.c
index 8c06430..2b54955 100644
--- a/drivers/usb/gadget/dummy_hcd.c
+++ b/drivers/usb/gadget/dummy_hcd.c
@@ -561,7 +561,6 @@ static int dummy_disable(struct usb_ep *_ep)
struct dummy_ep *ep;
struct dummy *dum;
unsigned long flags;
- int retval;

ep = usb_ep_to_dummy_ep(_ep);
if (!_ep || !ep->desc || _ep->name == ep0name)
@@ -571,12 +570,11 @@ static int dummy_disable(struct usb_ep *_ep)
spin_lock_irqsave(&dum->lock, flags);
ep->desc = NULL;
ep->stream_en = 0;
- retval = 0;
nuke(dum, ep);
spin_unlock_irqrestore(&dum->lock, flags);

dev_dbg(udc_dev(dum), "disabled %s\n", _ep->name);
- return retval;
+ return 0;
}

static struct usb_request *dummy_alloc_request(struct usb_ep *_ep,