Fix GSN-EDF sleep_next_period

The standard EDF implementation does not work for GSN-EDF since it does
not perform the task preparation in schedule().

1 files changed, 23 insertions, 1 deletions

diff --git a/kernel/sched_gsn_edf.c b/kernel/sched_gsn_edf.c
index 046fe41e09..10d3908442 100644
--- a/kernel/sched_gsn_edf.c
+++ b/kernel/sched_gsn_edf.c
@@ -666,6 +666,28 @@ static long gsnedf_return_priority(struct pi_semaphore *sem)
         return ret;
 }
 
+/*
+ *      Deactivate current task until the beginning of the next period.
+ */
+static  long gsnedf_sleep_next_period(void)
+{
+        /* Mark that we do not excute anymore */
+        set_rt_flags(t, RT_F_SLEEP);
+        sched_trace_job_completion(t);
+        /* prepare for next period */
+        prepare_for_next_period(t);     
+
+        /* unlink */
+        unlink(t);
+        /* requeue */
+        gsnedf_job_arrival(t);
+
+        /* will reschedule on return to user mode */
+        set_tsk_need_resched(t);
+        return 0;
+}
+
+
 static int gsnedf_mode_change(int new_mode)
 {
         unsigned long flags;
@@ -713,7 +735,7 @@ static sched_plugin_t s_plugin __cacheline_aligned_in_smp = {
         .algo_scheduler_tick    = gsnedf_scheduler_tick,        \
         .scheduler_tick         = rt_scheduler_tick,            \
         .prepare_task           = gsnedf_prepare_task,          \
-        .sleep_next_period      = edf_sleep_next_period,        \
+        .sleep_next_period      = gsnedf_sleep_next_period,     \
         .tear_down              = gsnedf_tear_down,             \
         .schedule               = gsnedf_schedule,              \
         .finish_switch          = gsnedf_finish_switch,         \