From 26307f6aa451708b8c60a49d605a78bbd29f70ef Mon Sep 17 00:00:00 2001 From: Fam Zheng Date: Thu, 4 Aug 2016 10:44:13 +0800 Subject: virtio-blk: Release s->rq queue at system_reset At system_reset, there is no point in retrying the queued request, because the driver that issued the request won't be around any more. Analyzed-by: Laszlo Ersek Reported-by: Laszlo Ersek Signed-off-by: Fam Zheng Reviewed-by: Laszlo Ersek Message-id: 1470278654-13525-2-git-send-email-famz@redhat.com Signed-off-by: Stefan Hajnoczi --- hw/block/virtio-blk.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'hw') diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index 475a822..1e348b1 100644 --- a/hw/block/virtio-blk.c +++ b/hw/block/virtio-blk.c @@ -654,6 +654,7 @@ static void virtio_blk_reset(VirtIODevice *vdev) { VirtIOBlock *s = VIRTIO_BLK(vdev); AioContext *ctx; + VirtIOBlockReq *req; /* * This should cancel pending requests, but can't do nicely until there @@ -663,6 +664,14 @@ static void virtio_blk_reset(VirtIODevice *vdev) aio_context_acquire(ctx); blk_drain(s->blk); + /* We drop queued requests after blk_drain() because blk_drain() itself can + * produce them. */ + while (s->rq) { + req = s->rq; + s->rq = req->next; + virtio_blk_free_request(req); + } + if (s->dataplane) { virtio_blk_data_plane_stop(s->dataplane); } -- cgit v1.1 From 27d1b87688dcea8702f06b5240abf6b8d8f53346 Mon Sep 17 00:00:00 2001 From: Fam Zheng Date: Thu, 4 Aug 2016 10:44:14 +0800 Subject: virtio-blk: Remove stale comment about draining This is stale after commit 6e40b3bf (virtio-blk: Use blk_drain() to drain IO requests), remove it. Suggested-by: Laszlo Ersek Signed-off-by: Fam Zheng Reviewed-by: Laszlo Ersek Message-id: 1470278654-13525-3-git-send-email-famz@redhat.com Signed-off-by: Stefan Hajnoczi --- hw/block/virtio-blk.c | 4 ---- 1 file changed, 4 deletions(-) (limited to 'hw') diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index 1e348b1..331d766 100644 --- a/hw/block/virtio-blk.c +++ b/hw/block/virtio-blk.c @@ -656,10 +656,6 @@ static void virtio_blk_reset(VirtIODevice *vdev) AioContext *ctx; VirtIOBlockReq *req; - /* - * This should cancel pending requests, but can't do nicely until there - * are per-device request lists. - */ ctx = blk_get_aio_context(s->blk); aio_context_acquire(ctx); blk_drain(s->blk); -- cgit v1.1