linux-kernel - [PATCH 4.9 18/60] drm/mediatek: fix mtk_hdmi_setup_vendor_specific

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Date:   Mon, 19 Jun 2017 23:17:12 +0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Nickey Yang <nickey.yang@...k-chips.com>,
        CK Hu <ck.hu@...iatek.com>
Subject: [PATCH 4.9 18/60] drm/mediatek: fix mtk_hdmi_setup_vendor_specific_infoframe mistake

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

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

From: YYS <nickey.yang@...k-chips.com>

commit 014580ffab654bb83256783a2b185cf6c06dffaa upstream.

mtk_hdmi_setup_vendor_specific_infoframe will return before handle
mtk_hdmi_hw_send_info_frame.Because hdmi_vendor_infoframe_pack
returns the number of bytes packed into the binary buffer or
a negative error code on failure.
So correct it.

Fixes: 8f83f26891e1 ("drm/mediatek: Add HDMI support")
Signed-off-by: Nickey Yang <nickey.yang@...k-chips.com>
Signed-off-by: CK Hu <ck.hu@...iatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/mediatek/mtk_hdmi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -1061,7 +1061,7 @@ static int mtk_hdmi_setup_vendor_specifi
 	}
 
 	err = hdmi_vendor_infoframe_pack(&frame, buffer, sizeof(buffer));
-	if (err) {
+	if (err < 0) {
 		dev_err(hdmi->dev, "Failed to pack vendor infoframe: %zd\n",
 			err);
 		return err;