Re: [PATCH] scsi: ufs: Fix proper API to send HPB pre-request

[Christoph Hellwig]

On Thu, Oct 28, 2021 at 10:07:52AM -0700, Bart Van Assche wrote:
> I spent some time looking around for other examples of allocating and
> inserting a request from inside block layer callbacks. I only found one
> such example, namely in the NVMe core. nvme_timeout() calls
> nvme_alloc_request() and blk_execute_rq_nowait(). The difference between
> what the UFS HPB code is doing and what nvme_timeout() does doesn't seem
> that big to me.

The difference is that nvme_timeout allocates a request on the
admin queue, and only does so for commands on the I/O queues.