From: Julian Wiedmann <jwi@xxxxxxxxxxxxx>
Date: Wed, 17 Apr 2019 18:29:13 +0200
> From: Arnd Bergmann <arnd@xxxxxxxx>
>
> 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 <natechancellor@xxxxxxxxx>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> Signed-off-by: Julian Wiedmann <jwi@xxxxxxxxxxxxx>
Applied.
