video: mxsfb: fix crash when unblanking the display
authorLothar Waßmann <LW@KARO-electronics.de>
Thu, 22 Nov 2012 12:49:14 +0000 (13:49 +0100)
committerShawn Guo <shawn.guo@linaro.org>
Fri, 4 Jan 2013 11:52:53 +0000 (19:52 +0800)
commit6c1ecba8d84841277d68140ef485335d5be28485
tree9e490bd2d23f48ddd37e2caa1ac96c413e70b3c4
parent664e9e495a3ada96ed2ebab89edb40c4fc132bd7
video: mxsfb: fix crash when unblanking the display

The VDCTRL4 register does not provide the MXS SET/CLR/TOGGLE feature.
The write in mxsfb_disable_controller() sets the data_cnt for the LCD
DMA to 0 which obviously means the max. count for the LCD DMA and
leads to overwriting arbitrary memory when the display is unblanked.

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Acked-by: Juergen Beisert <jbe@pengutronix.de>
Tested-by: Lauri Hintsala <lauri.hintsala@bluegiga.net>
Cc: <stable@vger.kernel.org>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
drivers/video/mxsfb.c