drivers/atm/atmtcp.c: add missing atm_dev_put

The earlier call to atm_dev_lookup increases the reference count of dev,
so decrease it on the way out.

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

// <smpl>
@@
expression x, E;
constant C;
@@

x = atm_dev_lookup(...);
... when != false x != NULL
    when != true x == NULL
    when != \(E = x\|x = E\)
    when != atm_dev_put(dev);
*return -C;
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/atm/atmtcp.c b/drivers/atm/atmtcp.c
index 2b464b631f22..0b0625054a87 100644
--- a/drivers/atm/atmtcp.c
+++ b/drivers/atm/atmtcp.c
@@ -392,7 +392,10 @@ static int atmtcp_attach(struct atm_vcc *vcc,int itf)
                         atm_dev_put(dev);
                         return -EMEDIUMTYPE;
                 }
-                if (PRIV(dev)->vcc) return -EBUSY;
+                if (PRIV(dev)->vcc) {
+                        atm_dev_put(dev);
+                        return -EBUSY;
+                }
         }
         else {
                 int error;