Re: [dm-devel] rqdm: bad usage of dm_get/dm_put (Was: Re: dm mpath: fix stall when requeueing io)

[Mikulas Patocka <mpatocka redhat com>]

> Indeed, we shouldn't use the current dm_put() in any interrupt-context.
> But the "mapped_device" can disappear in request-based dm while there
> is a request after all bios complete, so I used dm_get()/dm_put() there.
> I'll consider another way to prevent the problem without dm_get()/dm_put().
> E.g. wait for request completion in dm_put() instead.

How can a request-in-progress exists when all the bios complete and the 
device is closed?

Mikulas