fib: fib_result_assign() should not change fib refcounts

After commit ebc0ffae5 (RCU conversion of fib_lookup()),
fib_result_assign()  should not change fib refcounts anymore.

Thanks to Michael who did the bisection and bug report.

Reported-by: Michael Ellerman <michael@ellerman.id.au>
Tested-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/fib_lookup.h b/net/ipv4/fib_lookup.h
index a29edf2..c079cc0 100644 (file)
--- a/net/ipv4/fib_lookup.h
+++ b/net/ipv4/fib_lookup.h
@@ -47,11 +47,8 @@ extern int fib_detect_death(struct fib_info *fi, int order,
 static inline void fib_result_assign(struct fib_result *res,
                                     struct fib_info *fi)
 {
-       if (res->fi != NULL)
-               fib_info_put(res->fi);
+       /* we used to play games with refcounts, but we now use RCU */
        res->fi = fi;
-       if (fi != NULL)
-               atomic_inc(&fi->fib_clntref);
 }
 
 #endif /* _FIB_LOOKUP_H */