staging/fbtft: Initialize fb_op struct as static const

Replace dynamic allocation of the fb_ops instance with static
allocation. Initialize the fields at module-load time. The owner
field changes to THIS_MODULE, as in all other fbdev drivers.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230828132131.29295-8-tzimmermann@suse.de

drivers/staging/fbtft/fbtft-core.c

@@ -473,6 +473,18 @@ static int fbtft_fb_blank(int blank, struct fb_info *info)
 	return ret;
 }
 
+static const struct fb_ops fbtft_ops = {
+	.owner        = THIS_MODULE;
+	.fb_read      = fb_sys_read;
+	.fb_write     = fbtft_fb_write;
+	.fb_fillrect  = fbtft_fb_fillrect;
+	.fb_copyarea  = fbtft_fb_copyarea;
+	.fb_imageblit = fbtft_fb_imageblit;
+	.fb_setcolreg = fbtft_fb_setcolreg;
+	.fb_blank     = fbtft_fb_blank;
+	.fb_mmap      = fb_deferred_io_mmap;
+};
+
 static void fbtft_merge_fbtftops(struct fbtft_ops *dst, struct fbtft_ops *src)
 {
 	if (src->write)
@@ -521,7 +533,6 @@ static void fbtft_merge_fbtftops(struct fbtft_ops *dst, struct fbtft_ops *src)
  * Creates a new frame buffer info structure.
  *
  * Also creates and populates the following structures:
- *   info->fbops
  *   info->fbdefio
  *   info->pseudo_palette
  *   par->fbtftops
@@ -536,7 +547,6 @@ struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
 {
 	struct fb_info *info;
 	struct fbtft_par *par;
-	struct fb_ops *fbops = NULL;
 	struct fb_deferred_io *fbdefio = NULL;
 	u8 *vmem = NULL;
 	void *txbuf = NULL;
@@ -611,10 +621,6 @@ struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
 	if (!vmem)
 		goto alloc_fail;
 
-	fbops = devm_kzalloc(dev, sizeof(struct fb_ops), GFP_KERNEL);
-	if (!fbops)
-		goto alloc_fail;
-
 	fbdefio = devm_kzalloc(dev, sizeof(struct fb_deferred_io), GFP_KERNEL);
 	if (!fbdefio)
 		goto alloc_fail;
@@ -638,19 +644,9 @@ struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
 		goto alloc_fail;
 
 	info->screen_buffer = vmem;
-	info->fbops = fbops;
+	info->fbops = &fbtft_ops;
 	info->fbdefio = fbdefio;
 
-	fbops->owner        =      dev->driver->owner;
-	fbops->fb_read      =      fb_sys_read;
-	fbops->fb_write     =      fbtft_fb_write;
-	fbops->fb_fillrect  =      fbtft_fb_fillrect;
-	fbops->fb_copyarea  =      fbtft_fb_copyarea;
-	fbops->fb_imageblit =      fbtft_fb_imageblit;
-	fbops->fb_setcolreg =      fbtft_fb_setcolreg;
-	fbops->fb_blank     =      fbtft_fb_blank;
-	fbops->fb_mmap      =      fb_deferred_io_mmap;
-
 	fbdefio->delay =            HZ / fps;
 	fbdefio->sort_pagereflist = true;
 	fbdefio->deferred_io =      fbtft_deferred_io;