diff options
Diffstat (limited to 'drivers/video/fbmem.c')
| -rw-r--r-- | drivers/video/fbmem.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c index 01072f4b3e8f..279c2dbef8f8 100644 --- a/drivers/video/fbmem.c +++ b/drivers/video/fbmem.c @@ -1352,6 +1352,32 @@ static const struct file_operations fb_fops = { struct class *fb_class; EXPORT_SYMBOL(fb_class); + +static int fb_check_foreignness(struct fb_info *fi) +{ + const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN; + + fi->flags &= ~FBINFO_FOREIGN_ENDIAN; + +#ifdef __BIG_ENDIAN + fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH; +#else + fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0; +#endif /* __BIG_ENDIAN */ + + if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) { + pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to " + "support this framebuffer\n", fi->fix.id); + return -ENOSYS; + } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) { + pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to " + "support this framebuffer\n", fi->fix.id); + return -ENOSYS; + } + + return 0; +} + /** * register_framebuffer - registers a frame buffer device * @fb_info: frame buffer info structure @@ -1371,6 +1397,10 @@ register_framebuffer(struct fb_info *fb_info) if (num_registered_fb == FB_MAX) return -ENXIO; + + if (fb_check_foreignness(fb_info)) + return -ENOSYS; + num_registered_fb++; for (i = 0 ; i < FB_MAX; i++) if (!registered_fb[i]) |