[PATCH 2/4] fbdev: Wrap user-invoked calls to fb_blank() in helper

[Thomas Zimmermann <tzimmermann@suse.de>]

Handle fbcon during blanking in fb_blank_from_user(). First blank the
hardware, then blank fbcon. Same for unblanking. Update all callers and
resolve the duplicated logic.

With the new helper, fbdev's sysfb code no longer maintains fbcon state
by itself.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/video/fbdev/core/fb_chrdev.c   |  4 +---
 drivers/video/fbdev/core/fb_internal.h |  1 +
 drivers/video/fbdev/core/fbmem.c       | 10 ++++++++++
 drivers/video/fbdev/core/fbsysfs.c     |  5 +----
 4 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/video/fbdev/core/fb_chrdev.c b/drivers/video/fbdev/core/fb_chrdev.c
index 54f926fb411b..035e67d2c28f 100644
--- a/drivers/video/fbdev/core/fb_chrdev.c
+++ b/drivers/video/fbdev/core/fb_chrdev.c
@@ -138,9 +138,7 @@ static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
 			return -EINVAL;
 		console_lock();
 		lock_fb_info(info);
-		ret = fb_blank(info, arg);
-		/* might again call into fb_blank */
-		fbcon_fb_blanked(info, arg);
+		ret = fb_blank_from_user(info, arg);
 		unlock_fb_info(info);
 		console_unlock();
 		break;
diff --git a/drivers/video/fbdev/core/fb_internal.h b/drivers/video/fbdev/core/fb_internal.h
index 613832d335fe..62e75bf15b9b 100644
--- a/drivers/video/fbdev/core/fb_internal.h
+++ b/drivers/video/fbdev/core/fb_internal.h
@@ -44,6 +44,7 @@ extern struct fb_info *registered_fb[FB_MAX];
 extern int num_registered_fb;
 struct fb_info *get_fb_info(unsigned int idx);
 void put_fb_info(struct fb_info *fb_info);
+int fb_blank_from_user(struct fb_info *info, int blank);
 
 /* fb_procfs.c */
 #if defined(CONFIG_FB_DEVICE)
diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index d37a1039e221..1a6758653b64 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -422,6 +422,16 @@ int fb_blank(struct fb_info *info, int blank)
 }
 EXPORT_SYMBOL(fb_blank);
 
+int fb_blank_from_user(struct fb_info *info, int blank)
+{
+	int ret = fb_blank(info, blank);
+
+	/* might again call into fb_blank */
+	fbcon_fb_blanked(info, blank);
+
+	return ret;
+}
+
 static int fb_check_foreignness(struct fb_info *fi)
 {
 	const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
diff --git a/drivers/video/fbdev/core/fbsysfs.c b/drivers/video/fbdev/core/fbsysfs.c
index 5ece236e6252..d9743ef35355 100644
--- a/drivers/video/fbdev/core/fbsysfs.c
+++ b/drivers/video/fbdev/core/fbsysfs.c
@@ -7,7 +7,6 @@
 
 #include <linux/console.h>
 #include <linux/fb.h>
-#include <linux/fbcon.h>
 #include <linux/major.h>
 
 #include "fb_internal.h"
@@ -229,9 +228,7 @@ static ssize_t store_blank(struct device *device,
 
 	arg = simple_strtoul(buf, &last, 0);
 	console_lock();
-	err = fb_blank(fb_info, arg);
-	/* might again call into fb_blank */
-	fbcon_fb_blanked(fb_info, arg);
+	err = fb_blank_from_user(fb_info, arg);
 	console_unlock();
 	if (err < 0)
 		return err;
-- 
2.54.0