Den 03.04.2020 15.57, skrev Daniel Vetter:
> Also init the fbdev emulation before we register the device, that way
> we can rely on the auto-cleanup and simplify the probe error code even
> more.
>
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> Cc: Dave Airlie <airlied@xxxxxxxxxx>
> Cc: Sean Paul <sean@xxxxxxxxxx>
> Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Cc: Emil Velikov <emil.l.velikov@xxxxxxxxx>
> Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/udl/udl_drv.c | 36 +++++++++++------------------------
> 1 file changed, 11 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/gpu/drm/udl/udl_drv.c b/drivers/gpu/drm/udl/udl_drv.c
> index 1ce2d865c36d..4ba5149fdd57 100644
> --- a/drivers/gpu/drm/udl/udl_drv.c
> +++ b/drivers/gpu/drm/udl/udl_drv.c
> @@ -57,27 +57,20 @@ static struct udl_device *udl_driver_create(struct usb_interface *interface)
> struct udl_device *udl;
> int r;
>
> - udl = kzalloc(sizeof(*udl), GFP_KERNEL);
> - if (!udl)
> - return ERR_PTR(-ENOMEM);
> -
> - r = drm_dev_init(&udl->drm, &driver, &interface->dev);
> - if (r) {
> - kfree(udl);
> - return ERR_PTR(r);
> - }
> + udl = devm_drm_dev_alloc(&interface->dev, &driver,
> + struct udl_device, drm);
> + if (IS_ERR(udl))
> + return udl;
>
> udl->udev = udev;
> udl->drm.dev_private = udl;
> - drmm_add_final_kfree(&udl->drm, udl);
>
> r = udl_init(udl);
> - if (r) {
> - drm_dev_put(&udl->drm);
> + if (r)
> return ERR_PTR(r);
> - }
>
> usb_set_intfdata(interface, udl);
> +
> return udl;
> }
>
> @@ -91,23 +84,17 @@ static int udl_usb_probe(struct usb_interface *interface,
> if (IS_ERR(udl))
> return PTR_ERR(udl);
>
> + r = drm_fbdev_generic_setup(&udl->drm, 0);
It doesn't feel right to have a client open the device before the DRM
device itself is registered. I would prefer to keep it where it is but
ignore any errors. A failing client shouldn't prevent the driver from
probing. drm_fbdev_generic_setup() do print errors if it fails. So yeah,
in hindsight I should have made drm_fbdev_generic_setup() return void.
Noralf.
> + if (r)
> + return r;
> +
> r = drm_dev_register(&udl->drm, 0);
> if (r)
> - goto err_free;
> + return r;
>
> DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index);
>
> - r = drm_fbdev_generic_setup(&udl->drm, 0);
> - if (r)
> - goto err_drm_dev_unregister;
> -
> return 0;
> -
> -err_drm_dev_unregister:
> - drm_dev_unregister(&udl->drm);
> -err_free:
> - drm_dev_put(&udl->drm);
> - return r;
> }
>
> static void udl_usb_disconnect(struct usb_interface *interface)
> @@ -117,7 +104,6 @@ static void udl_usb_disconnect(struct usb_interface *interface)
> drm_kms_helper_poll_fini(dev);
> udl_drop_usb(dev);
> drm_dev_unplug(dev);
> - drm_dev_put(dev);
> }
>
> /*
>
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