nvdimm: virtio_pmem: drain requests in freeze

Browse source

virtio_pmem_freeze() currently deletes virtqueues and resets the device
without waking threads waiting for a virtqueue descriptor or a host
completion.

Mark the request virtqueue broken before reset. This makes new submissions
fail fast and lets -ENOSPC waiters leave the wait list. Reset the device
before draining used and unused request tokens, then delete the virtqueues.
This wakes waiters with -EIO. It also keeps the detach call on a quiesced
device.

Clear req_vq after del_vqs(). Make drain tolerate a NULL queue so remove
after freeze does not dereference a stale virtqueue pointer. Also make
virtio_pmem_flush() stop checking req_vq once the broken state is visible.
A waiter woken by freeze/remove can resume after del_vqs() has cleared
req_vq.

Signed-off-by: Li Chen <me@linux.beauty>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-ID: <20260630092338.2094628-13-me@linux.beauty>

...

This commit is contained in:

Li Chen 2026-06-30 17:23:37 +08:00 • committed by Michael S. Tsirkin

parent 36e33955ae

commit 74d7d137f4

2 changed files with 34 additions and 5 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

5

drivers/nvdimm/nd_virtio.c

View file

34

drivers/nvdimm/virtio_pmem.c

View file