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powerpc: Fix second nested oops hang

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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 <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2016-11-08 23:14:45 +11:00 committed by Michael Ellerman
parent 6f44b20ee9
commit 7458e8b2ce
1 changed files with 3 additions and 2 deletions
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5
arch/powerpc/kernel/traps.c
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@ -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");