vfb: Us fb_sys_read() and fb_sys_write()

Since vfb's framebuffer is vmalloc'ed, use the fb_sys_read() and fb_sys_write().

---

 drivers/video/Kconfig |    1 +
 drivers/video/vfb.c   |    2 ++
 2 files changed, 3 insertions(+), 0 deletions(-)

index 605feff..61931da 100644
@@ -1714,6 +1714,7 @@ config FB_VIRTUAL
 	select FB_SYS_FILLRECT
 	select FB_SYS_COPYAREA
 	select FB_SYS_IMAGEBLIT
+	select FB_SYS_FOPS
 	---help---
 	  This is a `virtual' frame buffer device. It operates on a chunk of
 	  unswappable kernel memory instead of on the memory of a graphics

index 1293c20..64ee78c 100644
@@ -84,6 +84,8 @@ static int vfb_mmap(struct fb_info *info
 		    struct vm_area_struct *vma);
 
 static struct fb_ops vfb_ops = {
+	.fb_read        = fb_sys_read,
+	.fb_write       = fb_sys_write,
 	.fb_check_var	= vfb_check_var,
 	.fb_set_par	= vfb_set_par,
 	.fb_setcolreg	= vfb_setcolreg,

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