linux-kernel - Re: [PATCH] pch_uart: Fix dma channel unallocated issue

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Message-ID: <20120409174405.GA25990@kroah.com>
Date:	Mon, 9 Apr 2012 10:44:05 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Tomoya MORINAGA <tomoya.rohm@...il.com>
Cc:	Alan Cox <alan@...ux.intel.com>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, qi.wang@...el.com,
	yong.y.wang@...el.com, joel.clark@...el.com, kok.howg.ewe@...el.com
Subject: Re: [PATCH] pch_uart: Fix dma channel unallocated issue

On Tue, Mar 27, 2012 at 06:56:02PM +0900, Tomoya MORINAGA wrote:
> 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@...il.com>
> ---
>  drivers/tty/serial/pch_uart.c |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)

This patch does not apply to 3.4-rc2, so I can not apply it, sorry.

Care to redo it?

greg k-h
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