Fixed the PI issue with down calls, should work now.

1 files changed, 13 insertions, 0 deletions

diff --git a/arch/i386/kernel/pi_sem_syscalls.c b/arch/i386/kernel/pi_sem_syscalls.c
index cab8270984..58400afbef 100644
--- a/arch/i386/kernel/pi_sem_syscalls.c
+++ b/arch/i386/kernel/pi_sem_syscalls.c
@@ -71,10 +71,23 @@ void __sys_pi_down(struct pi_semaphore * sem)
 
 asmlinkage long sys_pi_down(pi_sema_id sem_id)
 {
+        unsigned long flags;
+
         if (sem_id < 0 || sem_id >= MAX_PI_SEMAPHORES)
                 return -EINVAL;
 
         __sys_pi_down(&pi_sems[sem_id]);
+
+        /* Update inherited priority if required. */
+        spin_lock_irqsave(&pi_sems[sem_id].wait.lock, flags);
+        if (!current->rt_params.inh_task) {
+                pi_sems[sem_id].holder = current;
+                current->rt_params.inh_task = current;
+                if (pi_sems[sem_id].hp_sem_task)
+                        curr_sched_plugin->inherit_priority(
+                                &pi_sems[sem_id], pi_sems[sem_id].hp_sem_task);
+        }       
+        spin_unlock_irqrestore(&pi_sems[sem_id].wait.lock, flags);                      
         return 0;
 }