[IPSEC]: Document that policy direction is derived from the index.

Here is a patch that adds a helper called xfrm_policy_id2dir to
document the fact that the policy direction can be and is derived
from the index.

This is based on a patch by YOSHIFUJI Hideaki and 210313105@suda.edu.cn.

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

1 files changed, 2 insertions, 2 deletions

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index c6a0d34fc295..061b44cc2451 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -163,7 +163,7 @@ static void xfrm_policy_timer(unsigned long data)
         if (xp->dead)
                 goto out;
 
-        dir = xp->index & 7;
+        dir = xfrm_policy_id2dir(xp->index);
 
         if (xp->lft.hard_add_expires_seconds) {
                 long tmo = xp->lft.hard_add_expires_seconds +
@@ -417,7 +417,7 @@ struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete)
         struct xfrm_policy *pol, **p;
 
         write_lock_bh(&xfrm_policy_lock);
-        for (p = &xfrm_policy_list[id & 7]; (pol=*p)!=NULL; p = &pol->next) {
+        for (p = &xfrm_policy_list[dir]; (pol=*p)!=NULL; p = &pol->next) {
                 if (pol->index == id) {
                         xfrm_pol_hold(pol);
                         if (delete)