From: Arvind Yadav <arvind.yadav.cs@gmail.com>
Date: Fri, 17 Nov 2017 16:06:06 +0530
Subject: drm/sti: Handle return value of platform_get_irq_byname
Git-commit: c83ecfa5851f4d35be88f32dabb3a53f51cf5c32
Patch-mainline: v4.16-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

platform_get_irq_byname() can fail here and we must check its return
value.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/f4b4f1b2cfa5e302ef7ffad4e3efb0d3147709d3.1510914877.git.arvind.yadav.cs@gmail.com

Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/sti/sti_hdmi.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/gpu/drm/sti/sti_hdmi.c
+++ b/drivers/gpu/drm/sti/sti_hdmi.c
@@ -1413,6 +1413,11 @@ static int sti_hdmi_probe(struct platfor
 	init_waitqueue_head(&hdmi->wait_event);
 
 	hdmi->irq = platform_get_irq_byname(pdev, "irq");
+	if (hdmi->irq < 0) {
+		DRM_ERROR("Cannot get HDMI irq\n");
+		ret = hdmi->irq;
+		goto release_adapter;
+	}
 
 	ret = devm_request_threaded_irq(dev, hdmi->irq, hdmi_irq,
 			hdmi_irq_thread, IRQF_ONESHOT, dev_name(dev), hdmi);