[IA64] Only unwind non-running tasks.
Unwinding a running task has proven problematic. In one instance, the running task was attempting to unwind itself and received an interrupt between when get_wchan allocated local variables on the stack and when unw_init_from_blocked_task was called which resulted in unw_init_frame_info to place this tasks task_struct pointer over the switch stack's ar_bspstore entry. Signed-off-by: Robin Holt <holt@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
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@ -763,6 +763,9 @@ get_wchan (struct task_struct *p)
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unsigned long ip;
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int count = 0;
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if (!p || p == current || p->state == TASK_RUNNING)
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return 0;
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/*
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* Note: p may not be a blocked task (it could be current or
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* another process running on some other CPU. Rather than
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@ -773,6 +776,8 @@ get_wchan (struct task_struct *p)
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*/
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unw_init_from_blocked_task(&info, p);
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do {
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if (p->state == TASK_RUNNING)
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return 0;
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if (unw_unwind(&info) < 0)
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return 0;
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unw_get_ip(&info, &ip);
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