From c671d187f7e1bc5415f12be283957a0a1c324f93 Mon Sep 17 00:00:00 2001
From: Emil Velikov <emil.l.velikov@gmail.com>
Date: Sat, 30 May 2020 13:46:39 +0100
Subject: drm: vmwgfx: remove drm_driver::master_set() return type
Git-commit: 907f53200f982cd377e75abbc1b18ed624d7ae66
Patch-mainline: v5.9-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322

The function always returns zero (success). Ideally we'll remove it all
together - although that's requires a little more work.

For now, we can drop the return type and simplify the drm core code
surrounding it.

v2: remove redundant assignment (Sam)

Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: VMware Graphics <linux-graphics-maintainer@vmware.com>
Cc: Roland Scheidegger <sroland@vmware.com>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200530124640.4176323-1-emil.l.velikov@gmail.com
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/drm_auth.c          | 32 +++++++----------------------
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c |  8 +++-----
 include/drm/drm_drv.h               |  4 ++--
 3 files changed, 12 insertions(+), 32 deletions(-)

diff --git a/drivers/gpu/drm/drm_auth.c b/drivers/gpu/drm/drm_auth.c
index 74ce0c29c960..4c723e3a689c 100644
--- a/drivers/gpu/drm/drm_auth.c
+++ b/drivers/gpu/drm/drm_auth.c
@@ -122,27 +122,19 @@ struct drm_master *drm_master_create(struct drm_device *dev)
 	return master;
 }
 
-static int drm_set_master(struct drm_device *dev, struct drm_file *fpriv,
-			  bool new_master)
+static void drm_set_master(struct drm_device *dev, struct drm_file *fpriv,
+			   bool new_master)
 {
-	int ret = 0;
-
 	dev->master = drm_master_get(fpriv->master);
-	if (dev->driver->master_set) {
-		ret = dev->driver->master_set(dev, fpriv, new_master);
-		if (unlikely(ret != 0)) {
-			drm_master_put(&dev->master);
-		}
-	}
+	if (dev->driver->master_set)
+		dev->driver->master_set(dev, fpriv, new_master);
 
-	fpriv->was_master = (ret == 0);
-	return ret;
+	fpriv->was_master = true;
 }
 
 static int drm_new_set_master(struct drm_device *dev, struct drm_file *fpriv)
 {
 	struct drm_master *old_master;
-	int ret;
 
 	lockdep_assert_held_once(&dev->master_mutex);
 
@@ -157,22 +149,12 @@ static int drm_new_set_master(struct drm_device *dev, struct drm_file *fpriv)
 	fpriv->is_master = 1;
 	fpriv->authenticated = 1;
 
-	ret = drm_set_master(dev, fpriv, true);
-	if (ret)
-		goto out_err;
+	drm_set_master(dev, fpriv, true);
 
 	if (old_master)
 		drm_master_put(&old_master);
 
 	return 0;
-
-out_err:
-	/* drop references and restore old master on failure */
-	drm_master_put(&fpriv->master);
-	fpriv->master = old_master;
-	fpriv->is_master = 0;
-
-	return ret;
 }
 
 /*
@@ -265,7 +247,7 @@ int drm_setmaster_ioctl(struct drm_device *dev, void *data,
 		goto out_unlock;
 	}
 
-	ret = drm_set_master(dev, file_priv, false);
+	drm_set_master(dev, file_priv, false);
 out_unlock:
 	mutex_unlock(&dev->master_mutex);
 	return ret;
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index c2247a893ed4..470428387878 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -1129,9 +1129,9 @@ static long vmw_compat_ioctl(struct file *filp, unsigned int cmd,
 }
 #endif
 
-static int vmw_master_set(struct drm_device *dev,
-			  struct drm_file *file_priv,
-			  bool from_open)
+static void vmw_master_set(struct drm_device *dev,
+			   struct drm_file *file_priv,
+			   bool from_open)
 {
 	/*
 	 * Inform a new master that the layout may have changed while
@@ -1139,8 +1139,6 @@ static int vmw_master_set(struct drm_device *dev,
 	 */
 	if (!from_open)
 		drm_sysfs_hotplug_event(dev);
-
-	return 0;
 }
 
 static void vmw_master_drop(struct drm_device *dev,
diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index 8f110a28b6a2..7116abc1a04e 100644
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -311,8 +311,8 @@ struct drm_driver {
 	 *
 	 * Called whenever the minor master is set. Only used by vmwgfx.
 	 */
-	int (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
-			  bool from_open);
+	void (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
+			   bool from_open);
 	/**
 	 * @master_drop:
 	 *
-- 
2.29.2