irqchip: gicv3-its: Fix unsafe locking reported by lockdep
When compiled with CONFIG_LOCKDEP, the kernel shouts badly, saying
that my locking is unsafe. I'm afraid the kernel is right:
CPU0 CPU1
---- ----
lock(&its->lock);
local_irq_disable();
lock(&irq_desc_lock_class);
lock(&its->lock);
<Interrupt>
lock(&irq_desc_lock_class);
*** DEADLOCK ***
The fix is to always take its->lock with interrupts disabled.
Reported-by: Will Deacon <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Jason Cooper <[email protected]>
1 file changed
