[PATCH net-next 08/15] rxrpc: Fix call timer

[David Howells]

Fix the call timer in the following ways:

 (1) If call->resend_at or call->ack_at are before or equal to the current
     time, then ignore that timeout.

 (2) If call->expire_at is before or equal to the current time, then don't
     set the timer at all (possibly we should queue the call).

 (3) Don't skip modifying the timer if timer_pending() is true.  This
     indicates that the timer is working, not that it has expired and is
     running/waiting to run its expiry handler.

Also call rxrpc_set_timer() to start the call timer going rather than
calling add_timer().

Signed-off-by: David Howells <dhowe...@redhat.com>
---

 net/rxrpc/call_event.c  |   25 ++++++++++++++-----------
 net/rxrpc/call_object.c |    4 ++--
 2 files changed, 16 insertions(+), 13 deletions(-)

diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c
index 3a7f90a2659c..8bc5c8e37ab4 100644
--- a/net/rxrpc/call_event.c
+++ b/net/rxrpc/call_event.c
@@ -28,24 +28,27 @@ void rxrpc_set_timer(struct rxrpc_call *call)
 {
        unsigned long t, now = jiffies;
 
-       _enter("{%ld,%ld,%ld:%ld}",
-              call->ack_at - now, call->resend_at - now, call->expire_at - now,
-              call->timer.expires - now);
-
        read_lock_bh(&call->state_lock);
 
        if (call->state < RXRPC_CALL_COMPLETE) {
-               t = call->ack_at;
-               if (time_before(call->resend_at, t))
+               t = call->expire_at;
+               if (time_before_eq(t, now))
+                       goto out;
+
+               if (time_after(call->resend_at, now) &&
+                   time_before(call->resend_at, t))
                        t = call->resend_at;
-               if (time_before(call->expire_at, t))
-                       t = call->expire_at;
-               if (!timer_pending(&call->timer) ||
-                   time_before(t, call->timer.expires)) {
-                       _debug("set timer %ld", t - now);
+
+               if (time_after(call->ack_at, now) &&
+                   time_before(call->ack_at, t))
+                       t = call->ack_at;
+
+               if (call->timer.expires != t || !timer_pending(&call->timer)) {
                        mod_timer(&call->timer, t);
                }
        }
+
+out:
        read_unlock_bh(&call->state_lock);
 }
 
diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
index f50a6094e198..f2fadf667e19 100644
--- a/net/rxrpc/call_object.c
+++ b/net/rxrpc/call_object.c
@@ -199,8 +199,8 @@ static void rxrpc_start_call_timer(struct rxrpc_call *call)
        call->expire_at = expire_at;
        call->ack_at = expire_at;
        call->resend_at = expire_at;
-       call->timer.expires = expire_at;
-       add_timer(&call->timer);
+       call->timer.expires = expire_at + 1;
+       rxrpc_set_timer(call);
 }
 
 /*