Correct the returned error code for remapping the video framebuffer.
Introduce error handling for remapping MMIO register address space to avoid a NULL pointer dereference. Disable hardware acceleration if remapping MMIO register address space failed as those registers are only used for hardware acceleration. Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de> Cc: Scott Fang <ScottFang@viatech.com.cn> Cc: Joseph Chan <JosephChan@via.com.tw> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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