Apr 05 2015

HID: logitech-hidpp: fix error return code 

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

Return a negative error code on failure.

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

// 
@@
identifier ret; expression e1,e2;
@@
(
if (\(ret < 0\|ret != 0\))
 { ... return ret; }
|
ret = 0
)
... when != ret = e1
    when != &ret
*if(...)
{
  ... when != ret = e2
      when forall
 return ret;
}
// 

Signed-off-by: Julia Lawall 
Reviewed-by: Benjamin Tissoires 
Signed-off-by: Jiri Kosina 

---
 drivers/hid/hid-logitech-hidpp.c | 1 +
 1 file changed, 1 insertion(+)
 
diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 8e9cb25..b3cf6fd 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -1220,6 +1220,7 @@ static int hidpp_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	connected = hidpp_is_connected(hidpp);
 	if (id->group != HID_GROUP_LOGITECH_DJ_DEVICE) {
 		if (!connected) {
+			ret = -ENODEV;
 			hid_err(hdev, "Device not connected");
 			hid_device_io_stop(hdev);
 			goto hid_parse_fail;

qlambert