scsi: libcxgbi: fib6_ino reference in rt6_info is rcu protected

The fib6_info reference in rt6_info is rcu protected. Add a helper
to extract prefsrc from and update cxgbi_check_route6 to use it.

Fixes: 0153167aebd0 ("net/ipv6: Remove rt6i_prefsrc")
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/scsi/cxgbi/libcxgbi.c b/drivers/scsi/cxgbi/libcxgbi.c
index 6b3ea50c594e..75f876409fb9 100644
--- a/drivers/scsi/cxgbi/libcxgbi.c
+++ b/drivers/scsi/cxgbi/libcxgbi.c
@@ -784,7 +784,8 @@ cxgbi_check_route6(struct sockaddr *dst_addr, int ifindex)
         csk->mtu = mtu;
         csk->dst = dst;
 
-        if (!rt->from || ipv6_addr_any(&rt->from->fib6_prefsrc.addr)) {
+        rt6_get_prefsrc(rt, &pref_saddr);
+        if (ipv6_addr_any(&pref_saddr)) {
                 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
 
                 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
@@ -794,8 +795,6 @@ cxgbi_check_route6(struct sockaddr *dst_addr, int ifindex)
                                 &daddr6->sin6_addr);
                         goto rel_rt;
                 }
-        } else {
-                pref_saddr = rt->from->fib6_prefsrc.addr;
         }
 
         csk->csk_family = AF_INET6;