linux-kernel - Re: [PATCH 1/1] virtio/s390: fix vritio-ccw device teardown

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Message-ID: <20210916000039.7aebfe1a.pasic@linux.ibm.com>
Date:   Thu, 16 Sep 2021 00:00:39 +0200
From:   Halil Pasic <pasic@...ux.ibm.com>
To:     Cornelia Huck <cohuck@...hat.com>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Pierre Morel <pmorel@...ux.ibm.com>,
        Michael Mueller <mimu@...ux.ibm.com>,
        linux-s390@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     bfu@...hat.com, Vineeth Vijayan <vneethv@...ux.ibm.com>
Subject: Re: [PATCH 1/1] virtio/s390: fix vritio-ccw device teardown

s/vritio/virtio/
(subject)

[..]

On Wed, 15 Sep 2021 23:57:42 +0200
Halil Pasic <pasic@...ux.ibm.com> wrote:

> Since commit 48720ba56891 ("virtio/s390: use DMA memory for ccw I/O and
> classic notifiers") we were supposed to make sure that
> virtio_ccw_release_dev() completes before the ccw device, and the
> attached dma pool are torn down, but unfortunately we did not.
> Before that commit it used to be OK to delay cleaning up the memory
> allocated by virtio-ccw indefinitely (which isn't really intuitive for
> guys used to destruction happens in reverse construction order).
> 

[..]