[IPSEC]: Make xfrm_lookup flags argument a bit-field

This patch introduces an enum for bits in the flags argument of xfrm_lookup.
This is so that we can cram more information into it later.

Since all current users use just the values 0 and 1, XFRM_LOOKUP_WAIT has
been added with the value 1 << 0 to represent the current meaning of flags.

The test in __xfrm_lookup has been changed accordingly.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 6 insertions, 1 deletions

diff --git a/include/net/dst.h b/include/net/dst.h
index e86b9a008ebf..aaa2dbb50179 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -265,6 +265,11 @@ static inline struct dst_entry *dst_check(struct dst_entry *dst, u32 cookie)
 
 extern void             dst_init(void);
 
+/* Flags for xfrm_lookup flags argument. */
+enum {
+        XFRM_LOOKUP_WAIT = 1 << 0,
+};
+
 struct flowi;
 #ifndef CONFIG_XFRM
 static inline int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 95dc581861e8..3d516d57b5b2 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1565,7 +1565,7 @@ restart:
                                 xfrm_pol_put(policy);
                                 return -EREMOTE;
                         }
-                        if (err == -EAGAIN && flags) {
+                        if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) {
                                 DECLARE_WAITQUEUE(wait, current);
 
                                 add_wait_queue(&km_waitq, &wait);