Revert "Revert "Revert "fbdev: Allow client to request a particular /dev/fbN node"""

This reverts commit 8b914fd.

Author: popcornmix

drivers/video/fbdev/core/fbmem.c

@@ -31,7 +31,6 @@ struct class *fb_class;
 DEFINE_MUTEX(registration_lock);
 struct fb_info *registered_fb[FB_MAX] __read_mostly;
 int num_registered_fb __read_mostly;
-int min_dynamic_fb __read_mostly;
 #define for_each_registered_fb(i)		\
 	for (i = 0; i < FB_MAX; i++)		\
 		if (!registered_fb[i]) {} else
@@ -400,12 +399,10 @@ static int do_register_framebuffer(struct fb_info *fb_info)
 	if (num_registered_fb == FB_MAX)
 		return -ENXIO;
 
-	i = fb_info->node;
-	if (!fb_info->custom_fb_num || fb_info->node >= FB_MAX || registered_fb[fb_info->node]) {
-		for (i = min_dynamic_fb ; i < FB_MAX; i++)
-			if (!registered_fb[i])
-				break;
-	}
+	for (i = 0 ; i < FB_MAX; i++)
+		if (!registered_fb[i])
+			break;
+
 	if (!fb_info->modelist.prev || !fb_info->modelist.next)
 		INIT_LIST_HEAD(&fb_info->modelist);
 
@@ -506,12 +503,6 @@ static void do_unregister_framebuffer(struct fb_info *fb_info)
 	put_fb_info(fb_info);
 }
 
-void fb_set_lowest_dynamic_fb(int min_fb_dev)
-{
-	min_dynamic_fb = min_fb_dev;
-}
-EXPORT_SYMBOL(fb_set_lowest_dynamic_fb);
-
 /**
  *	register_framebuffer - registers a frame buffer device
  *	@fb_info: frame buffer info structure

include/linux/fb.h

@@ -511,7 +511,6 @@ struct fb_info {
 
 	bool skip_vt_switch; /* no VT switch on suspend/resume required */
 	bool skip_panic; /* Do not write to the fb after a panic */
-	bool custom_fb_num; /* Use value in node as the preferred node number */
 };
 
 /* This will go away
@@ -601,7 +600,6 @@ extern ssize_t fb_sys_write(struct fb_info *info, const char __user *buf,
 	.fb_imageblit	= sys_imageblit
 
 /* fbmem.c */
-extern void fb_set_lowest_dynamic_fb(int min_fb_dev);
 extern int register_framebuffer(struct fb_info *fb_info);
 extern void unregister_framebuffer(struct fb_info *fb_info);
 extern int devm_register_framebuffer(struct device *dev, struct fb_info *fb_info);