linux-kernel - [PATCH 5.11 191/775] drm/virtio: make sure context is created in gem open

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Date:   Mon,  1 Mar 2021 17:05:59 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Chia-I Wu <olvaffe@...il.com>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 191/775] drm/virtio: make sure context is created in gem open

From: Chia-I Wu <olvaffe@...il.com>

[ Upstream commit 8aeef9d4f48917ce85710949b079548974b4a638 ]

The context might still be missing when DRM_IOCTL_PRIME_FD_TO_HANDLE is
the first ioctl on the drm_file.

Fixes: 72b48ae800da ("drm/virtio: enqueue virtio_gpu_create_context after the first 3D ioctl")
Cc: Gurchetan Singh <gurchetansingh@...omium.org>
Cc: Gerd Hoffmann <kraxel@...hat.com>
Signed-off-by: Chia-I Wu <olvaffe@...il.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20210107210726.269584-1-olvaffe@gmail.com
Reviewed-by: Gurchetan Singh <gurchetansingh@...omium.org>
Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/virtio/virtgpu_gem.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_gem.c b/drivers/gpu/drm/virtio/virtgpu_gem.c
index c30c75ee83fce..8502400b2f9c9 100644
--- a/drivers/gpu/drm/virtio/virtgpu_gem.c
+++ b/drivers/gpu/drm/virtio/virtgpu_gem.c
@@ -39,9 +39,6 @@ static int virtio_gpu_gem_create(struct drm_file *file,
 	int ret;
 	u32 handle;
 
-	if (vgdev->has_virgl_3d)
-		virtio_gpu_create_context(dev, file);
-
 	ret = virtio_gpu_object_create(vgdev, params, &obj, NULL);
 	if (ret < 0)
 		return ret;
@@ -119,6 +116,11 @@ int virtio_gpu_gem_object_open(struct drm_gem_object *obj,
 	if (!vgdev->has_virgl_3d)
 		goto out_notify;
 
+	/* the context might still be missing when the first ioctl is
+	 * DRM_IOCTL_MODE_CREATE_DUMB or DRM_IOCTL_PRIME_FD_TO_HANDLE
+	 */
+	virtio_gpu_create_context(obj->dev, file);
+
 	objs = virtio_gpu_array_alloc(1);
 	if (!objs)
 		return -ENOMEM;
-- 
2.27.0