aloksinha2001/Linux3188 — pull request #29 by lgeek (2014-04-26 19:41:45+00:00)
Title: rk_fb: Return -NOIOCTLCMD for unsupported ioctl cmds

rk_fb_ioctl returned 0 for unhandled commands, which means success.
In return, xf86-video-fbturbo thought the framebuffer device
supports DMA accelerated copyarea operations, which resulted in
visual glitches in X when scrolling.