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From cc9a8ce29ba364abcf019f6fe44b218255b9e4d7 Mon Sep 17 00:00:00 2001
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From: Fam Zheng <famz@redhat.com>
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Date: Wed, 8 Feb 2017 07:05:34 +0100
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Subject: [PATCH 1/8] virtio-blk: Release s->rq queue at system_reset
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <20170208070534.10571-1-famz@redhat.com>
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Patchwork-id: 73642
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O-Subject: [RHEL-7.3.z qemu-kvm PATCH] virtio-blk: Release s->rq queue at system_reset
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Bugzilla: 1420049
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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At system_reset, there is no point in retrying the queued request,
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because the driver that issued the request won't be around any more.
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Analyzed-by: Laszlo Ersek <lersek@redhat.com>
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Reported-by: Laszlo Ersek <lersek@redhat.com>
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Reviewed-by: Laszlo Ersek <lersek@redhat.com>
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Message-id: 1470278654-13525-2-git-send-email-famz@redhat.com
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit 26307f6aa451708b8c60a49d605a78bbd29f70ef)
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Conflicts:
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hw/block/virtio-blk.c
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The context is different. The hunk is placed below bdrv_drain_all() with
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the comment updated to match downstream.
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There is no virtio_blk_free_request in qemu-kvm in RHEL 7, use g_free().
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/block/virtio-blk.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
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index 4f6aa22..462ac81 100644
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--- a/hw/block/virtio-blk.c
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+++ b/hw/block/virtio-blk.c
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@@ -474,6 +474,7 @@ static void virtio_blk_dma_restart_cb(void *opaque, int running,
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static void virtio_blk_reset(VirtIODevice *vdev)
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{
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VirtIOBlock *s = VIRTIO_BLK(vdev);
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+ VirtIOBlockReq *req;
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#ifdef CONFIG_VIRTIO_BLK_DATA_PLANE
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if (s->dataplane) {
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@@ -487,6 +488,13 @@ static void virtio_blk_reset(VirtIODevice *vdev)
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*/
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bdrv_drain_all();
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bdrv_set_enable_write_cache(s->bs, s->original_wce);
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+ /* We drop queued requests after bdrv_drain_all() because bdrv_drain_all()
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+ * itself can produce them. */
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+ while (s->rq) {
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+ req = s->rq;
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+ s->rq = req->next;
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+ g_free(req);
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+ }
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}
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/* coalesce internal state, copy to pci i/o region 0
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--
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1.8.3.1
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