UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

drm/vkms: Use devm_drm_dev_alloc 

This means we also need to slightly restructure the exit code, so that
final cleanup of the drm_device is triggered by unregistering the
platform device. Note that devres is both clean up when the driver is
unbound (not the case for vkms, we don't bind), and also when unregistering
the device (very much the case for vkms). Therefore we can rely on devres
even though vkms isn't a proper platform device driver.

This also somewhat untangles the load code, since the drm and platform device
setup are no longer interleaved, but two distinct steps.

v2: use devres_open/release_group so we can use devm without real
hacks in the driver core or having to create an entire fake bus for
testing drivers. Might want to extract this into helpers eventually,
maybe as a mock_drm_dev_alloc or test_drm_dev_alloc.

v3: Only deref vkms_device after checking it (Melissa)

Reviewed-by: Melissa Wen <melissa.srw@gmail.com>
Cc: Melissa Wen <melissa.srw@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Cc: Haneen Mohammed <hamohammed.sa@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200909091833.440548-1-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2020-09-09 11:18:33 +02:00
parent bcc0ef7f57
commit 53d77aaa3f
1 changed files with 28 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
drivers/gpu/drm/vkms/vkms_drv.c
View File

@ -61,9 +61,6 @@ static void vkms_release(struct drm_device *dev)
{
struct vkms_device *vkms = container_of(dev, struct vkms_device, drm);
platform_device_unregister(vkms->platform);
drm_atomic_helper_shutdown(&vkms->drm);
drm_mode_config_cleanup(&vkms->drm);
destroy_workqueue(vkms->output.composer_workq);
}
@ -144,30 +141,31 @@ static int vkms_modeset_init(struct vkms_device *vkmsdev)
static int __init vkms_init(void)
{
int ret;
struct platform_device *pdev;
vkms_device = kzalloc(sizeof(*vkms_device), GFP_KERNEL);
if (!vkms_device)
return -ENOMEM;
pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
if (IS_ERR(pdev))
return PTR_ERR(pdev);
vkms_device->platform =
platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
if (IS_ERR(vkms_device->platform)) {
ret = PTR_ERR(vkms_device->platform);
goto out_free;
if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) {
ret = -ENOMEM;
goto out_unregister;
}
ret = drm_dev_init(&vkms_device->drm, &vkms_driver,
&vkms_device->platform->dev);
if (ret)
goto out_unregister;
drmm_add_final_kfree(&vkms_device->drm, vkms_device);
vkms_device = devm_drm_dev_alloc(&pdev->dev, &vkms_driver,
struct vkms_device, drm);
if (IS_ERR(vkms_device)) {
ret = PTR_ERR(vkms_device);
goto out_devres;
}
vkms_device->platform = pdev;
ret = dma_coerce_mask_and_coherent(vkms_device->drm.dev,
DMA_BIT_MASK(64));
if (ret) {
DRM_ERROR("Could not initialize DMA support\n");
goto out_put;
goto out_devres;
}
vkms_device->drm.irq_enabled = true;
@ -175,39 +173,41 @@ static int __init vkms_init(void)
ret = drm_vblank_init(&vkms_device->drm, 1);
if (ret) {
DRM_ERROR("Failed to vblank\n");
goto out_put;
goto out_devres;
}
ret = vkms_modeset_init(vkms_device);
if (ret)
goto out_put;
goto out_devres;
ret = drm_dev_register(&vkms_device->drm, 0);
if (ret)
goto out_put;
goto out_devres;
return 0;
out_put:
drm_dev_put(&vkms_device->drm);
platform_device_unregister(vkms_device->platform);
return ret;
out_devres:
devres_release_group(&pdev->dev, NULL);
out_unregister:
platform_device_unregister(vkms_device->platform);
out_free:
kfree(vkms_device);
platform_device_unregister(pdev);
return ret;
}
static void __exit vkms_exit(void)
{
struct platform_device *pdev;
if (!vkms_device) {
DRM_INFO("vkms_device is NULL.\n");
return;
}
pdev = vkms_device->platform;
drm_dev_unregister(&vkms_device->drm);
drm_dev_put(&vkms_device->drm);
drm_atomic_helper_shutdown(&vkms_device->drm);
devres_release_group(&pdev->dev, NULL);
platform_device_unregister(pdev);
}
module_init(vkms_init);