From: Tomoya MORINAGA <tomoya.rohm@gmail.com>
Date: Thu, 12 Apr 2012 01:47:50 +0000 (+0900)
Subject: pch_uart: Fix dma channel unallocated issue
X-Git-Tag: v3.4-rc4~13^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=af6d17cdc8c89aeb3101f0d27cd32fc0592b40b2;p=pandora-kernel.git

pch_uart: Fix dma channel unallocated issue

This driver anticipates pch_uart_verify_port() is not called
during installation.
However, actually pch_uart_verify_port() is called during
installation.
As a result, memory access violation occurs like below.

0. initial value: use_dma=0
1. starup()
    - dma channel is not allocated because use_dma=0
2. pch_uart_verify_port()
    - Set use_dma=1
3. UART processing acts DMA mode because use_dma=1
     - memory access violation occurs!

This patch fixes the issue.

Solution:
Whenever pch_uart_verify_port() is called and then
dma channel is not allocated, the channel should be allocated.

Signed-off-by: Tomoya MORINAGA <tomoya.rohm@gmail.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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