release/5.2.59/drm-debugfs-fix-plain-echo-to-connector-force-attrib.patch

From 58a2254d418b6ce1cfaae84ff9541374b99a0c21 Mon Sep 17 00:00:00 2001
From: Michael Tretter <m.tretter@pengutronix.de>
Date: Thu, 17 Aug 2017 12:43:07 +0200
Subject: [PATCH] drm/debugfs: fix plain echo to connector "force" attribute

commit c704b17071c4dc571dca3af4e4151dac51de081a upstream.

Using plain echo to set the "force" connector attribute fails with
-EINVAL, because echo appends a newline to the output.

Replace strcmp with sysfs_streq to also accept strings that end with a
newline.

v2: use sysfs_streq instead of stripping trailing whitespace

Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170817104307.17124-1-m.tretter@pengutronix.de
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
index f8468eae0503..b531649e4ee2 100644
--- a/drivers/gpu/drm/drm_debugfs.c
+++ b/drivers/gpu/drm/drm_debugfs.c
@@ -354,13 +354,13 @@ static ssize_t connector_write(struct file *file, const char __user *ubuf,
 
 	buf[len] = '\0';
 
-	if (!strcmp(buf, "on"))
+	if (sysfs_streq(buf, "on"))
 		connector->force = DRM_FORCE_ON;
-	else if (!strcmp(buf, "digital"))
+	else if (sysfs_streq(buf, "digital"))
 		connector->force = DRM_FORCE_ON_DIGITAL;
-	else if (!strcmp(buf, "off"))
+	else if (sysfs_streq(buf, "off"))
 		connector->force = DRM_FORCE_OFF;
-	else if (!strcmp(buf, "unspecified"))
+	else if (sysfs_streq(buf, "unspecified"))
 		connector->force = DRM_FORCE_UNSPECIFIED;
 	else
 		return -EINVAL;
-- 
2.27.0