Bluetooth: Delay LTK encryption to let remote receive all keys

Some devices may refuse to re-encrypt with the LTK if they haven't
received all our keys yet. This patch adds a 250ms delay before
attempting re-encryption with the LTK.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/bluetooth/smp.h b/net/bluetooth/smp.h
index 676395f93702..f55d83617218 100644
--- a/net/bluetooth/smp.h
+++ b/net/bluetooth/smp.h
@@ -121,6 +121,8 @@ struct smp_cmd_security_req {
 #define SMP_FLAG_LTK_ENCRYPT    4
 #define SMP_FLAG_COMPLETE       5
 
+#define SMP_REENCRYPT_TIMEOUT   msecs_to_jiffies(250)
+
 struct smp_chan {
         struct l2cap_conn *conn;
         u8              preq[7]; /* SMP Pairing Request */
@@ -140,6 +142,7 @@ struct smp_chan {
         unsigned long   smp_flags;
         struct work_struct confirm;
         struct work_struct random;
+        struct delayed_work reencrypt;
 };
 
 /* SMP Commands */