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From:   Jian Jun Chen <jian.jun.chen@intel.com>
To:     virtualization@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org
Cc:     kraxel@redhat.com, mst@redhat.com, jasowang@redhat.com,
        yu1.wang@intel.com, shuo.a.liu@intel.com, jie.deng@intel.com,
        conghui.chen@intel.com, Jian Jun Chen <jian.jun.chen@intel.com>
Subject: [PATCH] virtio-input: reset device when going to sleep
Date:   Tue,  7 Aug 2018 11:02:10 +0800
Message-Id: <20180807030210.16543-1-jian.jun.chen@intel.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

When going to sleep all virtqueues are deleted, memory used for
descriptor table entries are freed. Device reset is required in
this case to notify the backend driver.

Signed-off-by: Jian Jun Chen <jian.jun.chen@intel.com>
---
 drivers/virtio/virtio_input.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/virtio/virtio_input.c b/drivers/virtio/virtio_input.c
index 3a0468f2ceb0..20ea660bf1fc 100644
--- a/drivers/virtio/virtio_input.c
+++ b/drivers/virtio/virtio_input.c
@@ -332,12 +332,16 @@ static void virtinput_remove(struct virtio_device *vdev)
 static int virtinput_freeze(struct virtio_device *vdev)
 {
 	struct virtio_input *vi = vdev->priv;
+	void *buf;
 	unsigned long flags;
 
 	spin_lock_irqsave(&vi->lock, flags);
 	vi->ready = false;
 	spin_unlock_irqrestore(&vi->lock, flags);
 
+	vdev->config->reset(vdev);
+	while ((buf = virtqueue_detach_unused_buf(vi->sts)) != NULL)
+		kfree(buf);
 	vdev->config->del_vqs(vdev);
 	return 0;
 }
-- 
2.17.1