Re: [RFC] usb: host: u132-hcd: Remove deprecated create_singlethread_workqueue

[Tejun Heo]

Hello, Alan.

On Wed, Jul 27, 2016 at 02:54:51PM -0400, Alan Stern wrote:
> > Hmm... I didn't know the whole USB stack could operate without
> > allocating memory.  Does usb stack have mempools and stuff all the way
> > through?
> 
> No -- the USB stack does need to allocate memory in order to operate.  
> But it is careful to use GFP_NOIO or GFP_ATOMIC for allocations that
> might be on the block-device path.

Hmm... That doesn't really make them dependable during memory reclaim.
What happens when those allocations fail?

Thanks.

-- 
tejun