Re: [PATCH] swiotlb: fix the deadlock in swiotlb_do_find_slots

[Guorui Yu <GuoRui.Yu@linux.alibaba.com>]

在 2023/2/13 17:28, kernel test robot 写道:
> Hi GuoRui.Yu",
> 
> Thank you for the patch! Perhaps something to improve:
> 
>     654		spin_lock_irqsave(&area->lock, flags);
>     655		if (unlikely(nslots > mem->area_nslabs - area->used))
>     656			goto not_found;
>     657	
>     658		slot_base = area_index * mem->area_nslabs;
>     659		index = wrap = wrap_area_index(mem, ALIGN(area->index, stride));
index_nowrap should be initialized to "index" here, and I will add this 
in v2.

I have done some stress tests locally to check if they can avoid the 
deadlock but they did not reveal this problem, I will pay more attention 
next time.
>     660	
>     661		do {

Guorui