From: Huang Shijie <shijie8@gmail.com>
Date: Wed, 18 Dec 2013 15:41:00 +0000 (+0800)
Subject: mtd: gpmi: add sanity check when mapping DMA for read_buf/write_buf
X-Git-Tag: v3.14-rc1~65^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0ff76a920e3558307567b45aa0a91fb914924bfc;p=pandora-kernel.git

mtd: gpmi: add sanity check when mapping DMA for read_buf/write_buf

The buffer pointer passed from the upper layer may points to
a buffer in the stack or a buffer allocated by vmalloc, and etc..

This patch adds more sanity check to this buffer.
After this patch, if we meet a buffer which is allocated by vmalloc or
a buffer in the stack, we will use our own DMA buffer @data_buffer_dma
to do the DMA operations. If the buffer is not the cases above, we will
map it for DMA operations directly.

Signed-off-by: Huang Shijie <shijie8@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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