From: Haren Myneni <[email protected]>
For soft reset during system hang, got an error "CPU did not take
control" for some CPUs even though they responded to soft-reset (called
SystemReset, die and called debugger - xmon). First these CPUs entered
into xmon by IPI callback and then got a soft-reset exception and
re-entered into xmon again. The first CPU which re-entered into xmon got
the output lock and made into xmon successfully without unlocking.
Hence, the next CPU(s) which re-entered into xmon try to acquire a lock
(get_output_lock). Therefore, we can not view state of those CPU(s).
[This is a simple, very low risk, obvious fix for an obvious bug, and
should go into 2.6.13. -- paulus]
Signed-off-by: Haren Myneni <[email protected]>
Signed-off-by: Paul Mackerras <[email protected]>
---
--- linux-2.6.13-rc4-git4/arch/ppc64/xmon/xmon.c.orig 2005-08-01 22:31:09.000000000 -0700
+++ linux-2.6.13-rc4-git4/arch/ppc64/xmon/xmon.c 2005-08-01 22:33:16.000000000 -0700
@@ -329,13 +329,16 @@ int xmon_core(struct pt_regs *regs, int
printf("cpu 0x%x: Exception %lx %s in xmon, "
"returning to main loop\n",
cpu, regs->trap, getvecname(TRAP(regs)));
+ release_output_lock();
longjmp(xmon_fault_jmp[cpu], 1);
}
if (setjmp(recurse_jmp) != 0) {
if (!in_xmon || !xmon_gate) {
+ get_output_lock();
printf("xmon: WARNING: bad recursive fault "
"on cpu 0x%x\n", cpu);
+ release_output_lock();
goto waiting;
}
secondary = !(xmon_taken && cpu == xmon_owner);
-
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