This is a note to let you know that I've just added the patch titled
virtio-blk: don't keep queue frozen during system suspend
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
virtio-blk-don-t-keep-queue-frozen-during-system-sus.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 75b47dcd09d1576be59360027b7f0309cb546d52
Author: Ming Lei <ming.lei@xxxxxxxxxx>
Date: Tue Nov 12 20:58:21 2024 +0800
virtio-blk: don't keep queue frozen during system suspend
[ Upstream commit 7678abee0867e6b7fb89aa40f6e9f575f755fb37 ]
Commit 4ce6e2db00de ("virtio-blk: Ensure no requests in virtqueues before
deleting vqs.") replaces queue quiesce with queue freeze in virtio-blk's
PM callbacks. And the motivation is to drain inflight IOs before suspending.
block layer's queue freeze looks very handy, but it is also easy to cause
deadlock, such as, any attempt to call into bio_queue_enter() may run into
deadlock if the queue is frozen in current context. There are all kinds
of ->suspend() called in suspend context, so keeping queue frozen in the
whole suspend context isn't one good idea. And Marek reported lockdep
warning[1] caused by virtio-blk's freeze queue in virtblk_freeze().
[1] https://lore.kernel.org/linux-block/ca16370e-d646-4eee-b9cc-87277c89c43c@xxxxxxxxxxx/
Given the motivation is to drain in-flight IOs, it can be done by calling
freeze & unfreeze, meantime restore to previous behavior by keeping queue
quiesced during suspend.
Cc: Yi Sun <yi.sun@xxxxxxxxxx>
Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
Cc: Jason Wang <jasowang@xxxxxxxxxx>
Cc: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
Cc: virtualization@xxxxxxxxxxxxxxx
Reported-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
Acked-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20241112125821.1475793-1-ming.lei@xxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 7eae3f373233..28ea9b511fd0 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -951,9 +951,12 @@ static void virtblk_remove(struct virtio_device *vdev)
static int virtblk_freeze(struct virtio_device *vdev)
{
struct virtio_blk *vblk = vdev->priv;
+ struct request_queue *q = vblk->disk->queue;
/* Ensure no requests in virtqueues before deleting vqs. */
- blk_mq_freeze_queue(vblk->disk->queue);
+ blk_mq_freeze_queue(q);
+ blk_mq_quiesce_queue_nowait(q);
+ blk_mq_unfreeze_queue(q);
/* Ensure we don't receive any more interrupts */
vdev->config->reset(vdev);
@@ -977,8 +980,8 @@ static int virtblk_restore(struct virtio_device *vdev)
return ret;
virtio_device_ready(vdev);
+ blk_mq_unquiesce_queue(vblk->disk->queue);
- blk_mq_unfreeze_queue(vblk->disk->queue);
return 0;
}
#endif
