fbmem: don't call copy_from/to_user() with mutex held

[net-next-2.6.git] / include / linux / fb.h

diff --git a/include/linux/fb.h b/include/linux/fb.h
index 818fe21257e8c62acdb8847be5af682c1cc186b7..31527e17076b7c8697dcf7fdeb9717d8dead779a 100644 (file)
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -960,6 +960,21 @@ extern struct fb_info *registered_fb[FB_MAX];
 extern int num_registered_fb;
 extern struct class *fb_class;
 
+static inline int lock_fb_info(struct fb_info *info)
+{
+       mutex_lock(&info->lock);
+       if (!info->fbops) {
+               mutex_unlock(&info->lock);
+               return 0;
+       }
+       return 1;
+}
+
+static inline void unlock_fb_info(struct fb_info *info)
+{
+       mutex_unlock(&info->lock);
+}
+
 static inline void __fb_pad_aligned_buffer(u8 *dst, u32 d_pitch,
                                           u8 *src, u32 s_pitch, u32 height)
 {