[PATCH 2/2] nvme-multipath: don't block on blk_queue_enter of the underlying device

[Christoph Hellwig]

On Tue, Mar 23, 2021 at 11:13:13AM -0700, Sagi Grimberg wrote:
> The deadlock in this patchset reproduces upstream. It is not possible to
> update the kernel in the env in the original report.
>
> So IFF we assume that this does not reproduce in upstream (pending
> proof), is there something that we can do with stable fixes? This will
> probably go back to everything that is before 5.8...

The direct_make_request removal should be pretty easily backportable.
In old kernels without the streamlined normal path it might cause minor
performance degradations, but the actual change should be trivial.