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virtio_input: Improve freeze handling

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When executing suspend to ram, if lacking the operations
to reset device and free unused buffers before deleting
a vq, resource leaks and inconsistent device status will
appear.

According to chapter "3.3.1 Driver Requirements: Device Cleanup:"
of virtio-specification:
  Driver MUST ensure a virtqueue isn’t live
  (by device reset) before removing exposed
  buffers.

Therefore, modify the virtinput_freeze function to reset the
device and delete the unused buffers before deleting the
virtqueue, just like virtinput_remove does.

Co-developed-by: Ying Xu <ying123.xu@samsung.com>
Signed-off-by: Ying Xu <ying123.xu@samsung.com>
Co-developed-by: Junnan Wu <junnan01.wu@samsung.com>
Signed-off-by: Junnan Wu <junnan01.wu@samsung.com>
Signed-off-by: Ying Gao <ying01.gao@samsung.com>
Message-Id: <20250812095118.3622717-1-ying01.gao@samsung.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Ying Gao 2025-08-12 17:51:18 +08:00 • committed by Michael S. Tsirkin
parent 24fc631539
commit 528d92bfc0
1 changed files with 4 additions and 0 deletions
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4
drivers/virtio/virtio_input.c
View file

@ -360,11 +360,15 @@ static int virtinput_freeze(struct virtio_device *vdev)
{
struct virtio_input *vi = vdev->priv;
unsigned long flags;
void *buf;
spin_lock_irqsave(&vi->lock, flags);
vi->ready = false;
spin_unlock_irqrestore(&vi->lock, flags);
virtio_reset_device(vdev);
while ((buf = virtqueue_detach_unused_buf(vi->sts)) != NULL)
kfree(buf);
vdev->config->del_vqs(vdev);
return 0;
}