[PATCH 0/3] virtio-gpu: bugfixes, virtio-vga support.

[PATCH 0/3] virtio-gpu: bugfixes, virtio-vga support.

[Gerd Hoffmann]

  Hi,

Here comes a bugfix collection for virtio-gpu and support for the
virtio-vga device (where we have to take care to kick out vesafb/efifb).

Patches and git branch are for drm-next.

please review & pick up,
  Gerd

The following changes since commit 284b2884a967dbd98b4c4cf7a8b583f974affca4:

  Merge tag 'omapdrm-4.2-atomic' of git://git.kernel.org/pub/scm/linux/kernel/git/tomba/linux into drm-next (2015-06-16 11:16:02 +1000)

are available in the git repository at:


  git://git.kraxel.org/linux virtio-gpu-drm-next

for you to fetch changes up to d5084f1711c8917d48006e19099060b3b8387bb5:

  virtio-gpu: add locking for vbuf pool (2015-06-16 11:22:41 +0200)

----------------------------------------------------------------
Dave Airlie (2):
      drm/virtgpu: initialise fbdev after getting initial display info
      virtio-gpu: add locking for vbuf pool

Gerd Hoffmann (1):
      Add virtio-vga bits.

 drivers/gpu/drm/virtio/virtgpu_drm_bus.c | 44 +++++++++++++++++---------------
 drivers/gpu/drm/virtio/virtgpu_drv.h     |  2 ++
 drivers/gpu/drm/virtio/virtgpu_kms.c     |  4 ++-
 drivers/gpu/drm/virtio/virtgpu_vq.c      |  9 +++++++
 4 files changed, 38 insertions(+), 21 deletions(-)
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[PATCH 1/3] Add virtio-vga bits.

[Gerd Hoffmann]

---
 drivers/gpu/drm/virtio/virtgpu_drm_bus.c | 44 +++++++++++++++++---------------
 1 file changed, 24 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
index f4ec816..88a3916 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
+++ b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
@@ -37,6 +37,26 @@ int drm_virtio_set_busid(struct drm_device *dev, struct drm_master *master)
 	return 0;
 }
 
+static void virtio_pci_kick_out_firmware_fb(struct pci_dev *pci_dev)
+{
+	struct apertures_struct *ap;
+	bool primary;
+
+	ap = alloc_apertures(1);
+	if (!ap)
+		return;
+
+	ap->ranges[0].base = pci_resource_start(pci_dev, 0);
+	ap->ranges[0].size = pci_resource_len(pci_dev, 0);
+
+	primary = pci_dev->resource[PCI_ROM_RESOURCE].flags
+		& IORESOURCE_ROM_SHADOW;
+
+	remove_conflicting_framebuffers(ap, "virtiodrmfb", primary);
+
+	kfree(ap);
+}
+
 int drm_virtio_init(struct drm_driver *driver, struct virtio_device *vdev)
 {
 	struct drm_device *dev;
@@ -52,27 +72,11 @@ int drm_virtio_init(struct drm_driver *driver, struct virtio_device *vdev)
 		struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
 		bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
 
-		if (vga) {
-			/*
-			 * Need to make sure we don't have two drivers
-			 * for the same hardware here.  Some day we
-			 * will simply kick out the firmware
-			 * (vesa/efi) framebuffer.
-			 *
-			 * Virtual hardware specs for virtio-vga are
-			 * not finalized yet, therefore we can't add
-			 * code for that yet.
-			 *
-			 * So ignore the device for the time being,
-			 * and suggest to the user use the device
-			 * variant without vga compatibility mode.
-			 */
-			DRM_ERROR("virtio-vga not (yet) supported\n");
-			DRM_ERROR("please use virtio-gpu-pci instead\n");
-			ret = -ENODEV;
-			goto err_free;
-		}
+		DRM_INFO("pci: %s detected\n",
+			 vga ? "virtio-vga" : "virtio-gpu-pci");
 		dev->pdev = pdev;
+		if (vga)
+			virtio_pci_kick_out_firmware_fb(pdev);
 	}
 
 	ret = drm_dev_register(dev, 0);
-- 
1.8.3.1

[PATCH 1/3] Add virtio-vga bits.

[Gerd Hoffmann]

---
 drivers/gpu/drm/virtio/virtgpu_drm_bus.c | 44 +++++++++++++++++---------------
 1 file changed, 24 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
index f4ec816..88a3916 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
+++ b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
@@ -37,6 +37,26 @@ int drm_virtio_set_busid(struct drm_device *dev, struct drm_master *master)
 	return 0;
 }
 
+static void virtio_pci_kick_out_firmware_fb(struct pci_dev *pci_dev)
+{
+	struct apertures_struct *ap;
+	bool primary;
+
+	ap = alloc_apertures(1);
+	if (!ap)
+		return;
+
+	ap->ranges[0].base = pci_resource_start(pci_dev, 0);
+	ap->ranges[0].size = pci_resource_len(pci_dev, 0);
+
+	primary = pci_dev->resource[PCI_ROM_RESOURCE].flags
+		& IORESOURCE_ROM_SHADOW;
+
+	remove_conflicting_framebuffers(ap, "virtiodrmfb", primary);
+
+	kfree(ap);
+}
+
 int drm_virtio_init(struct drm_driver *driver, struct virtio_device *vdev)
 {
 	struct drm_device *dev;
@@ -52,27 +72,11 @@ int drm_virtio_init(struct drm_driver *driver, struct virtio_device *vdev)
 		struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
 		bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
 
-		if (vga) {
-			/*
-			 * Need to make sure we don't have two drivers
-			 * for the same hardware here.  Some day we
-			 * will simply kick out the firmware
-			 * (vesa/efi) framebuffer.
-			 *
-			 * Virtual hardware specs for virtio-vga are
-			 * not finalized yet, therefore we can't add
-			 * code for that yet.
-			 *
-			 * So ignore the device for the time being,
-			 * and suggest to the user use the device
-			 * variant without vga compatibility mode.
-			 */
-			DRM_ERROR("virtio-vga not (yet) supported\n");
-			DRM_ERROR("please use virtio-gpu-pci instead\n");
-			ret = -ENODEV;
-			goto err_free;
-		}
+		DRM_INFO("pci: %s detected\n",
+			 vga ? "virtio-vga" : "virtio-gpu-pci");
 		dev->pdev = pdev;
+		if (vga)
+			virtio_pci_kick_out_firmware_fb(pdev);
 	}
 
 	ret = drm_dev_register(dev, 0);
-- 
1.8.3.1

[PATCH 2/3] drm/virtgpu: initialise fbdev after getting initial display info

From: Dave Airlie <airlied@redhat.com>

This should avoid issues with the fbdev path trying to render
before we've gotten the display info.

Signed-off-by: Dave Airlie <airlied@redhat.com>

[ kraxel: wait for display-info reply ]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/virtio/virtgpu_drv.h | 1 +
 drivers/gpu/drm/virtio/virtgpu_kms.c | 4 +++-
 drivers/gpu/drm/virtio/virtgpu_vq.c  | 2 ++
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index e5a2c09..ff8de3d 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -171,6 +171,7 @@ struct virtio_gpu_device {
 	wait_queue_head_t resp_wq;
 	/* current display info */
 	spinlock_t display_info_lock;
+	bool display_info_pending;
 
 	struct virtio_gpu_fence_driver fence_drv;
 
diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
index 132405f..782766c 100644
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -137,9 +137,11 @@ int virtio_gpu_driver_load(struct drm_device *dev, unsigned long flags)
 	virtio_device_ready(vgdev->vdev);
 	vgdev->vqs_ready = true;
 
+	virtio_gpu_cmd_get_display_info(vgdev);
+	wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
+			   5 * HZ);
 	if (virtio_gpu_fbdev)
 		virtio_gpu_fbdev_init(vgdev);
-	virtio_gpu_cmd_get_display_info(vgdev);
 
 	return 0;
 
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 8fa6513e..c506792 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -534,6 +534,7 @@ static void virtio_gpu_cmd_get_display_info_cb(struct virtio_gpu_device *vgdev,
 		}
 	}
 
+	vgdev->display_info_pending = false;
 	spin_unlock(&vgdev->display_info_lock);
 	wake_up(&vgdev->resp_wq);
 
@@ -558,6 +559,7 @@ int virtio_gpu_cmd_get_display_info(struct virtio_gpu_device *vgdev)
 		 resp_buf);
 	memset(cmd_p, 0, sizeof(*cmd_p));
 
+	vgdev->display_info_pending = true;
 	cmd_p->type = cpu_to_le32(VIRTIO_GPU_CMD_GET_DISPLAY_INFO);
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
 	return 0;
-- 
1.8.3.1

[PATCH 2/3] drm/virtgpu: initialise fbdev after getting initial display info

[Gerd Hoffmann]

From: Dave Airlie <airlied@redhat.com>

This should avoid issues with the fbdev path trying to render
before we've gotten the display info.

Signed-off-by: Dave Airlie <airlied@redhat.com>

[ kraxel: wait for display-info reply ]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/virtio/virtgpu_drv.h | 1 +
 drivers/gpu/drm/virtio/virtgpu_kms.c | 4 +++-
 drivers/gpu/drm/virtio/virtgpu_vq.c  | 2 ++
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index e5a2c09..ff8de3d 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -171,6 +171,7 @@ struct virtio_gpu_device {
 	wait_queue_head_t resp_wq;
 	/* current display info */
 	spinlock_t display_info_lock;
+	bool display_info_pending;
 
 	struct virtio_gpu_fence_driver fence_drv;
 
diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
index 132405f..782766c 100644
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -137,9 +137,11 @@ int virtio_gpu_driver_load(struct drm_device *dev, unsigned long flags)
 	virtio_device_ready(vgdev->vdev);
 	vgdev->vqs_ready = true;
 
+	virtio_gpu_cmd_get_display_info(vgdev);
+	wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
+			   5 * HZ);
 	if (virtio_gpu_fbdev)
 		virtio_gpu_fbdev_init(vgdev);
-	virtio_gpu_cmd_get_display_info(vgdev);
 
 	return 0;
 
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 8fa6513e..c506792 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -534,6 +534,7 @@ static void virtio_gpu_cmd_get_display_info_cb(struct virtio_gpu_device *vgdev,
 		}
 	}
 
+	vgdev->display_info_pending = false;
 	spin_unlock(&vgdev->display_info_lock);
 	wake_up(&vgdev->resp_wq);
 
@@ -558,6 +559,7 @@ int virtio_gpu_cmd_get_display_info(struct virtio_gpu_device *vgdev)
 		 resp_buf);
 	memset(cmd_p, 0, sizeof(*cmd_p));
 
+	vgdev->display_info_pending = true;
 	cmd_p->type = cpu_to_le32(VIRTIO_GPU_CMD_GET_DISPLAY_INFO);
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
 	return 0;
-- 
1.8.3.1

[PATCH 2/3] drm/virtgpu: initialise fbdev after getting initial display info

[Gerd Hoffmann]

From: Dave Airlie <airlied@redhat.com>

This should avoid issues with the fbdev path trying to render
before we've gotten the display info.

Signed-off-by: Dave Airlie <airlied@redhat.com>

[ kraxel: wait for display-info reply ]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/virtio/virtgpu_drv.h | 1 +
 drivers/gpu/drm/virtio/virtgpu_kms.c | 4 +++-
 drivers/gpu/drm/virtio/virtgpu_vq.c  | 2 ++
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index e5a2c09..ff8de3d 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -171,6 +171,7 @@ struct virtio_gpu_device {
 	wait_queue_head_t resp_wq;
 	/* current display info */
 	spinlock_t display_info_lock;
+	bool display_info_pending;
 
 	struct virtio_gpu_fence_driver fence_drv;
 
diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
index 132405f..782766c 100644
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -137,9 +137,11 @@ int virtio_gpu_driver_load(struct drm_device *dev, unsigned long flags)
 	virtio_device_ready(vgdev->vdev);
 	vgdev->vqs_ready = true;
 
+	virtio_gpu_cmd_get_display_info(vgdev);
+	wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending,
+			   5 * HZ);
 	if (virtio_gpu_fbdev)
 		virtio_gpu_fbdev_init(vgdev);
-	virtio_gpu_cmd_get_display_info(vgdev);
 
 	return 0;
 
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 8fa6513e..c506792 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -534,6 +534,7 @@ static void virtio_gpu_cmd_get_display_info_cb(struct virtio_gpu_device *vgdev,
 		}
 	}
 
+	vgdev->display_info_pending = false;
 	spin_unlock(&vgdev->display_info_lock);
 	wake_up(&vgdev->resp_wq);
 
@@ -558,6 +559,7 @@ int virtio_gpu_cmd_get_display_info(struct virtio_gpu_device *vgdev)
 		 resp_buf);
 	memset(cmd_p, 0, sizeof(*cmd_p));
 
+	vgdev->display_info_pending = true;
 	cmd_p->type = cpu_to_le32(VIRTIO_GPU_CMD_GET_DISPLAY_INFO);
 	virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
 	return 0;
-- 
1.8.3.1

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dri-devel@lists.freedesktop.org
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[PATCH 3/3] virtio-gpu: add locking for vbuf pool

[Gerd Hoffmann]

From: Dave Airlie <airlied@redhat.com>

Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@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

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

[Gerd Hoffmann]

From: Dave Airlie <airlied@redhat.com>

Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@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