* [PATCH AUTOSEL 5.4 4/4] virtio-blk: Ensure no requests in virtqueues before deleting vqs.
[not found] <20240213002420.673218-1-sashal@kernel.org>
@ 2024-02-13 0:24 ` Sasha Levin
0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2024-02-13 0:24 UTC (permalink / raw
To: linux-kernel, stable
Cc: Yi Sun, Stefan Hajnoczi, Jens Axboe, Sasha Levin, mst, jasowang,
virtualization, linux-block
From: Yi Sun <yi.sun@unisoc.com>
[ Upstream commit 4ce6e2db00de8103a0687fb0f65fd17124a51aaa ]
Ensure no remaining requests in virtqueues before resetting vdev and
deleting virtqueues. Otherwise these requests will never be completed.
It may cause the system to become unresponsive.
Function blk_mq_quiesce_queue() can ensure that requests have become
in_flight status, but it cannot guarantee that requests have been
processed by the device. Virtqueues should never be deleted before
all requests become complete status.
Function blk_mq_freeze_queue() ensure that all requests in virtqueues
become complete status. And no requests can enter in virtqueues.
Signed-off-by: Yi Sun <yi.sun@unisoc.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Link: https://lore.kernel.org/r/20240129085250.1550594-1-yi.sun@unisoc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/block/virtio_blk.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 9b3ea86c20e5..3afc07b59477 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -1063,14 +1063,15 @@ static int virtblk_freeze(struct virtio_device *vdev)
{
struct virtio_blk *vblk = vdev->priv;
+ /* Ensure no requests in virtqueues before deleting vqs. */
+ blk_mq_freeze_queue(vblk->disk->queue);
+
/* Ensure we don't receive any more interrupts */
vdev->config->reset(vdev);
/* Make sure no work handler is accessing the device. */
flush_work(&vblk->config_work);
- blk_mq_quiesce_queue(vblk->disk->queue);
-
vdev->config->del_vqs(vdev);
kfree(vblk->vqs);
@@ -1088,7 +1089,7 @@ static int virtblk_restore(struct virtio_device *vdev)
virtio_device_ready(vdev);
- blk_mq_unquiesce_queue(vblk->disk->queue);
+ blk_mq_unfreeze_queue(vblk->disk->queue);
return 0;
}
#endif
--
2.43.0
^ permalink raw reply related [flat|nested] only message in thread
only message in thread, other threads:[~2024-02-13 0:24 UTC | newest]
Thread overview: (only message) (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
[not found] <20240213002420.673218-1-sashal@kernel.org>
2024-02-13 0:24 ` [PATCH AUTOSEL 5.4 4/4] virtio-blk: Ensure no requests in virtqueues before deleting vqs Sasha Levin
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).