diff mbox series

[v7,3/4] drm/virtio: track whether or not a context has been initiated

Message ID 20200225000800.2966-3-gurchetansingh@chromium.org (mailing list archive)
State New, archived
Headers show
Series [v7,1/4] drm/virtio: use consistent names for drm_files | expand

Commit Message

Gurchetan Singh Feb. 25, 2020, 12:07 a.m. UTC 
Use an boolean variable to track whether a context has been
initiated.

v5: Fix possible race and sleep via mutex (olv)

Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
---
 drivers/gpu/drm/virtio/virtgpu_drv.h   | 2 ++
 drivers/gpu/drm/virtio/virtgpu_ioctl.c | 8 ++++++++
 drivers/gpu/drm/virtio/virtgpu_kms.c   | 3 +++
 3 files changed, 13 insertions(+)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 72c1d9b59dfe..76b7b7c30e10 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -209,6 +209,8 @@  struct virtio_gpu_device {
 
 struct virtio_gpu_fpriv {
 	uint32_t ctx_id;
+	bool context_created;
+	struct mutex context_lock;
 };
 
 /* virtio_ioctl.c */
diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 00ef9fd3fbf6..ec38cf5573aa 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -40,10 +40,18 @@  void virtio_gpu_create_context(struct drm_device *dev,
 	struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
 	char dbgname[TASK_COMM_LEN];
 
+	mutex_lock(&vfpriv->context_lock);
+	if (vfpriv->context_created)
+		goto out_unlock;
+
 	get_task_comm(dbgname, current);
 	virtio_gpu_cmd_context_create(vgdev, vfpriv->ctx_id,
 				      strlen(dbgname), dbgname);
 	virtio_gpu_notify(vgdev);
+	vfpriv->context_created = true;
+
+out_unlock:
+	mutex_unlock(&vfpriv->context_lock);
 }
 
 static int virtio_gpu_map_ioctl(struct drm_device *dev, void *data,
diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
index f7e3712502ca..424729cb81d1 100644
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -258,6 +258,8 @@  int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
 	if (!vfpriv)
 		return -ENOMEM;
 
+	mutex_init(&vfpriv->context_lock);
+
 	handle = ida_alloc(&vgdev->ctx_id_ida, GFP_KERNEL);
 	if (handle < 0) {
 		kfree(vfpriv);
@@ -281,6 +283,7 @@  void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
 	vfpriv = file->driver_priv;
 
 	virtio_gpu_context_destroy(vgdev, vfpriv->ctx_id);
+	mutex_destroy(&vfpriv->context_lock);
 	kfree(vfpriv);
 	file->driver_priv = NULL;
 }