From 2c2770541040318fa6ac0ac4424d8af6dd0709bf Mon Sep 17 00:00:00 2001
From: Leilei Zhao <leilei.zhao@atmel.com>
Date: Fri, 27 Feb 2015 16:07:14 +0800
Subject: [PATCH] tty/serial: at91: correct check of buf used in DMA

We only use buf of ring In DMA rx function while using buf of xmit
in DMA tx function. So in DMA rx we need definitively to check the
buf of ring which is corresponding to DMA rx function. And use macro
PAGE_ALIGNED to simplify the expression.

Signed-off-by: Leilei Zhao <leilei.zhao@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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