Patch "RDMA/cma: Fix unknown symbol when CONFIG_IPV6 is not enabled" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

RDMA/cma: Fix unknown symbol when CONFIG_IPV6 is not enabled

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
rdma-cma-fix-unknown-symbol-when-config_ipv6-is-not-enabled.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Jack Morgenstein <[email protected]>
Date: Sun, 15 Jan 2017 20:15:00 +0200
Subject: RDMA/cma: Fix unknown symbol when CONFIG_IPV6 is not enabled

From: Jack Morgenstein <[email protected]>

commit b4cfe3971f6eab542dd7ecc398bfa1aeec889934 upstream.

If IPV6 has not been enabled in the underlying kernel, we must avoid calling IPV6 procedures in rdma_cm.ko.

This requires using "IS_ENABLED(CONFIG_IPV6)" in "if" statements surrounding any code which calls external IPV6 procedures.

In the instance fixed here, procedure cma_bind_addr() called ipv6_addr_type() -- which resulted in calling external procedure __ipv6_addr_type().

---
 drivers/infiniband/core/cma.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

@@ -2768,7 +2768,8 @@ static int cma_bind_addr(struct rdma_cm_
 	if (!src_addr || !src_addr->sa_family) {
 		src_addr = (struct sockaddr *) &id->route.addr.src_addr;
 		src_addr->sa_family = dst_addr->sa_family;
-		if (dst_addr->sa_family == AF_INET6) {
+		if (IS_ENABLED(CONFIG_IPV6) &&
+		    dst_addr->sa_family == AF_INET6) {
 			struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
 			struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
 			src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/rdma-cma-fix-unknown-symbol-when-config_ipv6-is-not-enabled.patch