On Tue, 06 Jun 2023 09:14:38 +0800, Yu Kuai wrote:
> Recursive spin_lock/unlock_irq() is not safe, because spin_unlock_irq()
> will enable irq unconditionally:
>
> spin_lock_irq queue_lock -> disable irq
> spin_lock_irq ioc->lock
> spin_unlock_irq ioc->lock -> enable irq
> /*
> * AA dead lock will be triggered if current context is preempted by irq,
> * and irq try to hold queue_lock again.
> */
> spin_unlock_irq queue_lock
>
> [...]
Applied, thanks!
[1/1] blk-ioc: fix recursive spin_lock/unlock_irq() in ioc_clear_queue()
commit: a7cfa0af0c88353b4eb59db5a2a0fbe35329b3f9
Best regards,
--
Jens Axboe
