linux-kernel - [PATCH 4.20 062/145] DRM: UDL: get rid of useless vblank initialization

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Date:   Mon,  7 Jan 2019 13:31:39 +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,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [PATCH 4.20 062/145] DRM: UDL: get rid of useless vblank initialization

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>

commit 32e932e37e6b6e13b66add307192c7ddd40a781d upstream.

UDL doesn't support vblank functionality so we don't need to
initialize vblank here (we are able to send page flip
completion events even without vblank initialization)

Moreover current drm_vblank_init call with num_crtcs > 0 causes
sending DRM_EVENT_FLIP_COMPLETE event with zero timestamp every
time. This breaks userspace apps (for example weston) which
relies on timestamp value.

Cc: stable@...r.kernel.org
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180928144126.21598-1-Eugeniy.Paltsev@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/udl/udl_main.c |    7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

--- a/drivers/gpu/drm/udl/udl_main.c
+++ b/drivers/gpu/drm/udl/udl_main.c
@@ -350,15 +350,10 @@ int udl_driver_load(struct drm_device *d
 	if (ret)
 		goto err;
 
-	ret = drm_vblank_init(dev, 1);
-	if (ret)
-		goto err_fb;
-
 	drm_kms_helper_poll_init(dev);
 
 	return 0;
-err_fb:
-	udl_fbdev_cleanup(dev);
+
 err:
 	if (udl->urbs.count)
 		udl_free_urb_list(dev);