[PATCH 3/3] virtio-gpu: add locking for vbuf pool

[Gerd Hoffmann]

From: Dave Airlie <airl...@redhat.com>

Signed-off-by: Dave Airlie <airl...@redhat.com>
Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
 drivers/gpu/drm/virtio/virtgpu_drv.h | 1 +
 drivers/gpu/drm/virtio/virtgpu_vq.c  | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h 
b/drivers/gpu/drm/virtio/virtgpu_drv.h
index ff8de3d..6d4db2d 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -162,6 +162,7 @@ struct virtio_gpu_device {
        struct virtio_gpu_queue ctrlq;
        struct virtio_gpu_queue cursorq;
        struct list_head free_vbufs;
+       spinlock_t free_vbufs_lock;
        void *vbufs;
        bool vqs_ready;
 
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c 
b/drivers/gpu/drm/virtio/virtgpu_vq.c
index c506792..1698669f 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -79,6 +79,7 @@ int virtio_gpu_alloc_vbufs(struct virtio_gpu_device *vgdev)
        void *ptr;
 
        INIT_LIST_HEAD(&vgdev->free_vbufs);
+       spin_lock_init(&vgdev->free_vbufs_lock);
        count += virtqueue_get_vring_size(vgdev->ctrlq.vq);
        count += virtqueue_get_vring_size(vgdev->cursorq.vq);
        size = count * VBUFFER_SIZE;
@@ -106,6 +107,7 @@ void virtio_gpu_free_vbufs(struct virtio_gpu_device *vgdev)
        count += virtqueue_get_vring_size(vgdev->ctrlq.vq);
        count += virtqueue_get_vring_size(vgdev->cursorq.vq);
 
+       spin_lock(&vgdev->free_vbufs_lock);
        for (i = 0; i < count; i++) {
                if (WARN_ON(list_empty(&vgdev->free_vbufs)))
                        return;
@@ -113,6 +115,7 @@ void virtio_gpu_free_vbufs(struct virtio_gpu_device *vgdev)
                                        struct virtio_gpu_vbuffer, list);
                list_del(&vbuf->list);
        }
+       spin_unlock(&vgdev->free_vbufs_lock);
        kfree(vgdev->vbufs);
 }
 
@@ -123,10 +126,12 @@ virtio_gpu_get_vbuf(struct virtio_gpu_device *vgdev,
 {
        struct virtio_gpu_vbuffer *vbuf;
 
+       spin_lock(&vgdev->free_vbufs_lock);
        BUG_ON(list_empty(&vgdev->free_vbufs));
        vbuf = list_first_entry(&vgdev->free_vbufs,
                                struct virtio_gpu_vbuffer, list);
        list_del(&vbuf->list);
+       spin_unlock(&vgdev->free_vbufs_lock);
        memset(vbuf, 0, VBUFFER_SIZE);
 
        BUG_ON(size > MAX_INLINE_CMD_SIZE);
@@ -201,7 +206,9 @@ static void free_vbuf(struct virtio_gpu_device *vgdev,
        if (vbuf->resp_size > MAX_INLINE_RESP_SIZE)
                kfree(vbuf->resp_buf);
        kfree(vbuf->data_buf);
+       spin_lock(&vgdev->free_vbufs_lock);
        list_add(&vbuf->list, &vgdev->free_vbufs);
+       spin_unlock(&vgdev->free_vbufs_lock);
 }
 
 static void reclaim_vbufs(struct virtqueue *vq, struct list_head *reclaim_list)
-- 
1.8.3.1

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