[IA64] Only unwind non-running tasks.

[net-next-2.6.git] / arch / ia64 / kernel / process.c

diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index d1c3ed9943e52d8ccad85553e1d1008ae7dc3629..af73b8dfde282c0c91f84b3f8da062327d18a069 100644 (file)
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -763,6 +763,9 @@ get_wchan (struct task_struct *p)
        unsigned long ip;
        int count = 0;
 
+       if (!p || p == current || p->state == TASK_RUNNING)
+               return 0;
+
        /*
         * Note: p may not be a blocked task (it could be current or
         * another process running on some other CPU.  Rather than
@@ -773,6 +776,8 @@ get_wchan (struct task_struct *p)
         */
        unw_init_from_blocked_task(&info, p);
        do {
+               if (p->state == TASK_RUNNING)
+                       return 0;
                if (unw_unwind(&info) < 0)
                        return 0;
                unw_get_ip(&info, &ip);