Re: [net 1/1] tipc: tipc clang warning

[David Miller <davem@davemloft.net>]

From: Jon Maloy <jon.maloy@ericsson.com>
Date: Fri, 22 Mar 2019 15:03:51 +0100

> When checking the code with clang -Wsometimes-uninitialized we get the
> following warning:
> 
> if (!tipc_link_is_establishing(l)) {
>     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> net/tipc/node.c:847:46: note: uninitialized use occurs here
>       tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr);
> 
> net/tipc/node.c:831:2: note: remove the 'if' if its condition is always
> true
> if (!tipc_link_is_establishing(l)) {
>     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> net/tipc/node.c:821:31: note: initialize the variable 'maddr' to silence
> this warning
> struct tipc_media_addr *maddr;
> 
> We fix this by initializing 'maddr' to NULL. For the matter of clarity,
> we also test if 'xmitq' is non-empty before we use it and 'maddr'
> further down in the  function. It will never happen that 'xmitq' is non-
> empty at the same time as 'maddr' is NULL, so this is a sufficient test.
> 
> Fixes: 598411d70f85 ("tipc: make resetting of links non-atomic")
> Reported-by: Nathan Chancellor <natechancellor@gmail.com>
> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>

Applied.