Commit 8255d263 authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Greg Kroah-Hartman

drm: rcar-du: Simplify and fix probe error handling

commit 4f7b0d26 upstream.

It isn't safe to call drm_dev_unregister() without first initializing
mode setting with drm_mode_config_init(). This leads to a crash if
either IO memory can't be remapped or vblank initialization fails.

Fix this by reordering the initialization sequence. Move vblank
initialization after the drm_mode_config_init() call, and move IO
remapping before drm_dev_alloc() to avoid the need to perform clean up
in case of failure.

While at it remove the explicit drm_vblank_cleanup() call from
rcar_du_remove() as the drm_dev_unregister() function already cleans up
vblank.
Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: default avatarthongsyho <thong.ho.px@rvc.renesas.com>
Signed-off-by: default avatarNhan Nguyen <nhan.nguyen.yb@renesas.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5ec9d83b
......@@ -260,7 +260,6 @@ static int rcar_du_remove(struct platform_device *pdev)
drm_kms_helper_poll_fini(ddev);
drm_mode_config_cleanup(ddev);
drm_vblank_cleanup(ddev);
drm_dev_unref(ddev);
......@@ -291,6 +290,15 @@ static int rcar_du_probe(struct platform_device *pdev)
rcdu->dev = &pdev->dev;
rcdu->info = of_match_device(rcar_du_of_table, rcdu->dev)->data;
platform_set_drvdata(pdev, rcdu);
/* I/O resources */
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
rcdu->mmio = devm_ioremap_resource(&pdev->dev, mem);
if (IS_ERR(rcdu->mmio))
ret = PTR_ERR(rcdu->mmio);
/* DRM/KMS objects */
ddev = drm_dev_alloc(&rcar_du_driver, &pdev->dev);
if (!ddev)
return -ENOMEM;
......@@ -300,26 +308,6 @@ static int rcar_du_probe(struct platform_device *pdev)
rcdu->ddev = ddev;
ddev->dev_private = rcdu;
platform_set_drvdata(pdev, rcdu);
/* I/O resources */
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
rcdu->mmio = devm_ioremap_resource(&pdev->dev, mem);
if (IS_ERR(rcdu->mmio)) {
ret = PTR_ERR(rcdu->mmio);
goto error;
}
/* Initialize vertical blanking interrupts handling. Start with vblank
* disabled for all CRTCs.
*/
ret = drm_vblank_init(ddev, (1 << rcdu->info->num_crtcs) - 1);
if (ret < 0) {
dev_err(&pdev->dev, "failed to initialize vblank\n");
goto error;
}
/* DRM/KMS objects */
ret = rcar_du_modeset_init(rcdu);
if (ret < 0) {
dev_err(&pdev->dev, "failed to initialize DRM/KMS (%d)\n", ret);
......
......@@ -761,6 +761,13 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu)
if (ret < 0)
return ret;
/* Initialize vertical blanking interrupts handling. Start with vblank
* disabled for all CRTCs.
*/
ret = drm_vblank_init(dev, (1 << rcdu->info->num_crtcs) - 1);
if (ret < 0)
return ret;
/* Initialize the groups. */
num_groups = DIV_ROUND_UP(rcdu->num_crtcs, 2);
......
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