[PATCH 2/2] powerpc: fix second nested oops hang

[Nicholas Piggin]

When ending an oops, don't clear die_owner unless the nest count
went to zero. This prevents a second nested oops from hanging forever
on the die_lock.

Signed-off-by: Nicholas Piggin <npig...@gmail.com>
---
 arch/powerpc/kernel/traps.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 26c3ba4..ba78e38 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -147,14 +147,15 @@ static void oops_end(unsigned long flags, struct pt_regs 
*regs,
                               int signr)
 {
        bust_spinlocks(0);
-       die_owner = -1;
        add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
        die_nest_count--;
        oops_exit();
        printk("\n");
-       if (!die_nest_count)
+       if (!die_nest_count) {
                /* Nest count reaches zero, release the lock. */
+               die_owner = -1;
                arch_spin_unlock(&die_lock);
+       }
        raw_local_irq_restore(flags);
 
        crash_fadump(regs, "die oops");
-- 
2.10.2