fbdev: Use screen_buffer in fb_sys_{read,write}()

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.

Since the fb_sys_{read,write}() functions operate on the latter address
space, it is wrong to use .screen_base and .screen_buffer must be used
instead. This also gets rid of all the casting needed due to not using
the correct data type.

v2:
	* add detailed commit message (Javier)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Sui Jingfeng <suijingfeng@loongson.cn>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Helge Deller <deller@gmx.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230428122452.4856-16-tzimmermann@suse.de

diff --git a/drivers/video/fbdev/core/fb_sys_fops.c b/drivers/video/fbdev/core/fb_sys_fops.c
index cefb77b9546d083074b1d2eb65cf0c13f48932fb..6589123f4127a07dc7103dfe456f692af7170f34 100644 (file)
--- a/drivers/video/fbdev/core/fb_sys_fops.c
+++ b/drivers/video/fbdev/core/fb_sys_fops.c
@@ -39,7 +39,7 @@ ssize_t fb_sys_read(struct fb_info *info, char __user *buf, size_t count,
        if (count + p > total_size)
                count = total_size - p;
 
-       src = (void __force *)(info->screen_base + p);
+       src = info->screen_buffer + p;
 
        if (info->fbops->fb_sync)
                info->fbops->fb_sync(info);
@@ -87,7 +87,7 @@ ssize_t fb_sys_write(struct fb_info *info, const char __user *buf,
                count = total_size - p;
        }
 
-       dst = (void __force *) (info->screen_base + p);
+       dst = info->screen_buffer + p;
 
        if (info->fbops->fb_sync)
                info->fbops->fb_sync(info);