From: Julia Lawall <Julia.Lawall@lip6.fr>
Date: Sat, 14 Jul 2012 16:43:04 +0000 (+0200)
Subject: can: softing: softing_main: ensure a consistent return value in error case
X-Git-Tag: firefly_0821_release~3680^2~2381^2~138^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=da78b7998e365b3f90b2a1a55d3b6ba6cc0c5905;p=firefly-linux-kernel-4.4.55.git

can: softing: softing_main: ensure a consistent return value in error case

Typically, the return value desired for the failure of a function with an
integer return value is a negative integer.  In these cases, the return
value is sometimes a negative integer and sometimes 0, due to a subsequent
initialization of the return variable within the loop.

A simplified version of the semantic match that finds this problem is:
(http://coccinelle.lip6.fr/)

//<smpl>
@r exists@
identifier ret;
position p;
constant C;
expression e1,e3,e4;
statement S;
@@

ret = -C
... when != ret = e3
    when any
if@p (...) S
... when any
if (\(ret != 0\|ret < 0\|ret > 0\) || ...) { ... return ...; }
... when != ret = e3
    when any
*if@p (...)
{
  ... when != ret = e4
  return ret;
}
//</smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Acked-by: Kurt Van Dijck <kurt.van.dijck@eia.be>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---

diff --git a/drivers/net/can/softing/softing_main.c b/drivers/net/can/softing/softing_main.c
index a7c77c744ee9..f2a221e7b968 100644
--- a/drivers/net/can/softing/softing_main.c
+++ b/drivers/net/can/softing/softing_main.c
@@ -826,12 +826,12 @@ static __devinit int softing_pdev_probe(struct platform_device *pdev)
 		goto sysfs_failed;
 	}
 
-	ret = -ENOMEM;
 	for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
 		card->net[j] = netdev =
 			softing_netdev_create(card, card->id.chip[j]);
 		if (!netdev) {
 			dev_alert(&pdev->dev, "failed to make can[%i]", j);
+			ret = -ENOMEM;
 			goto netdev_failed;
 		}
 		priv = netdev_priv(card->net[j]);