fbdev/smscufx: Use struct fb_info.screen_buffer

Use info->screen_buffer when reading and writing framebuffers in
system memory. It's the correct pointer for this address space.

The struct fb_info has a union to store the framebuffer memory. This can
either be info->screen_base if the framebuffer is stored in I/O memory,
or info->screen_buffer if the framebuffer is stored in system memory.

As the driver operates on the latter address space, it is wrong to use
.screen_base and .screen_buffer must be used instead.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230428122452.4856-11-tzimmermann@suse.de

drivers/video/fbdev/smscufx.c

@@ -1150,7 +1150,7 @@ static void ufx_free_framebuffer(struct ufx_data *dev)
 		fb_dealloc_cmap(&info->cmap);
 	if (info->monspecs.modedb)
 		fb_destroy_modedb(info->monspecs.modedb);
-	vfree(info->screen_base);
+	vfree(info->screen_buffer);
 
 	fb_destroy_modelist(&info->modelist);
 
@@ -1257,7 +1257,7 @@ static int ufx_ops_set_par(struct fb_info *info)
 
 	if ((result == 0) && (dev->fb_count == 0)) {
 		/* paint greenscreen */
-		pix_framebuffer = (u16 *) info->screen_base;
+		pix_framebuffer = (u16 *)info->screen_buffer;
 		for (i = 0; i < info->fix.smem_len / 2; i++)
 			pix_framebuffer[i] = 0x37e6;
 
@@ -1303,7 +1303,7 @@ static int ufx_realloc_framebuffer(struct ufx_data *dev, struct fb_info *info)
 {
 	int old_len = info->fix.smem_len;
 	int new_len;
-	unsigned char *old_fb = info->screen_base;
+	unsigned char *old_fb = info->screen_buffer;
 	unsigned char *new_fb;
 
 	pr_debug("Reallocating framebuffer. Addresses will change!");
@@ -1318,12 +1318,12 @@ static int ufx_realloc_framebuffer(struct ufx_data *dev, struct fb_info *info)
 		if (!new_fb)
 			return -ENOMEM;
 
-		if (info->screen_base) {
+		if (info->screen_buffer) {
 			memcpy(new_fb, old_fb, old_len);
-			vfree(info->screen_base);
+			vfree(info->screen_buffer);
 		}
 
-		info->screen_base = new_fb;
+		info->screen_buffer = new_fb;
 		info->fix.smem_len = PAGE_ALIGN(new_len);
 		info->fix.smem_start = (unsigned long) new_fb;
 		info->flags = smscufx_info_flags;
@@ -1746,7 +1746,7 @@ static int ufx_usb_probe(struct usb_interface *interface,
 	atomic_set(&dev->usb_active, 0);
 setup_modes:
 	fb_destroy_modedb(info->monspecs.modedb);
-	vfree(info->screen_base);
+	vfree(info->screen_buffer);
 	fb_destroy_modelist(&info->modelist);
 error:
 	fb_dealloc_cmap(&info->cmap);