From: Arnd Bergmann <a...@arndb.de>
[ Upstream commit 27b141fc234a3670d21bd742c35d7205d03cbb3a ]
clang points out that the return code from this function is
undefined for one of the error paths:
../drivers/s390/net/ctcm_main.c:1595:7: warning: variable 'result' is used
uninitialized whenever 'if' condition is true
[-Wsometimes-uninitialized]
if (priv->channel[direction] == NULL) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../drivers/s390/net/ctcm_main.c:1638:9: note: uninitialized use occurs here
return result;
^~~~~~
../drivers/s390/net/ctcm_main.c:1595:3: note: remove the 'if' if its condition
is always false
if (priv->channel[direction] == NULL) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../drivers/s390/net/ctcm_main.c:1539:12: note: initialize the variable 'result'
to silence this warning
int result;
^
Make it return -ENODEV here, as in the related failure cases.
gcc has a known bug in underreporting some of these warnings
when it has already eliminated the assignment of the return code
based on some earlier optimization step.
Reviewed-by: Nathan Chancellor <natechancel...@gmail.com>
Signed-off-by: Arnd Bergmann <a...@arndb.de>
Signed-off-by: Julian Wiedmann <j...@linux.ibm.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
drivers/s390/net/ctcm_main.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/s390/net/ctcm_main.c b/drivers/s390/net/ctcm_main.c
index e056dd4fe44d..5526388f905e 100644
--- a/drivers/s390/net/ctcm_main.c
+++ b/drivers/s390/net/ctcm_main.c
@@ -1595,6 +1595,7 @@ static int ctcm_new_device(struct ccwgroup_device *cgdev)
if (priv->channel[direction] == NULL) {
if (direction == CTCM_WRITE)
channel_free(priv->channel[CTCM_READ]);
+ result = -ENODEV;
goto out_dev;
}
priv->channel[direction]->netdev = dev;
--
2.20.1
