fbdev/core: Move procfs code to separate file

Move fbdev's procfs code into a separate file and contain it in
init and cleanup helpers. For the cleanup, replace remove_proc_entry()
with proc_remove(). It is equivalent in functionality, but looks
more like an inverse of proc_create_seq().

v2:
	* document proc_remove() usage (Sam)
	* revert unrelated removal of for_each_registered_fb()

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230613110953.24176-36-tzimmermann@suse.de

1 files changed, 6 insertions, 42 deletions

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 66532774d351..536209901e32 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -24,9 +24,7 @@
 #include <linux/vt.h>
 #include <linux/init.h>
 #include <linux/linux_logo.h>
-#include <linux/proc_fs.h>
 #include <linux/platform_device.h>
-#include <linux/seq_file.h>
 #include <linux/console.h>
 #include <linux/kmod.h>
 #include <linux/err.h>
@@ -48,8 +46,7 @@
 
 #define FBPIXMAPSIZE	(1024 * 8)
 
-static DEFINE_MUTEX(registration_lock);
-
+DEFINE_MUTEX(registration_lock);
 struct fb_info *registered_fb[FB_MAX] __read_mostly;
 int num_registered_fb __read_mostly;
 #define for_each_registered_fb(i)		\
@@ -705,40 +702,6 @@ int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
 EXPORT_SYMBOL(fb_prepare_logo);
 EXPORT_SYMBOL(fb_show_logo);
 
-static void *fb_seq_start(struct seq_file *m, loff_t *pos)
-{
-	mutex_lock(&registration_lock);
-	return (*pos < FB_MAX) ? pos : NULL;
-}
-
-static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
-{
-	(*pos)++;
-	return (*pos < FB_MAX) ? pos : NULL;
-}
-
-static void fb_seq_stop(struct seq_file *m, void *v)
-{
-	mutex_unlock(&registration_lock);
-}
-
-static int fb_seq_show(struct seq_file *m, void *v)
-{
-	int i = *(loff_t *)v;
-	struct fb_info *fi = registered_fb[i];
-
-	if (fi)
-		seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
-	return 0;
-}
-
-static const struct seq_operations __maybe_unused proc_fb_seq_ops = {
-	.start	= fb_seq_start,
-	.next	= fb_seq_next,
-	.stop	= fb_seq_stop,
-	.show	= fb_seq_show,
-};
-
 /*
  * We hold a reference to the fb_info in file->private_data,
  * but if the current registered fb has changed, we don't
@@ -1624,8 +1587,9 @@ fbmem_init(void)
 {
 	int ret;
 
-	if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops))
-		return -ENOMEM;
+	ret = fb_init_procfs();
+	if (ret)
+		return ret;
 
 	ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
 	if (ret) {
@@ -1648,7 +1612,7 @@ fbmem_init(void)
 err_class:
 	unregister_chrdev(FB_MAJOR, "fb");
 err_chrdev:
-	remove_proc_entry("fb", NULL);
+	fb_cleanup_procfs();
 	return ret;
 }
 
@@ -1659,7 +1623,7 @@ fbmem_exit(void)
 {
 	fb_console_exit();
 
-	remove_proc_entry("fb", NULL);
+	fb_cleanup_procfs();
 	class_destroy(fb_class);
 	unregister_chrdev(FB_MAJOR, "fb");
 }