From: Chanho Min <chanho0207@gmail.com>
Date: Mon, 20 Feb 2012 01:24:40 +0000 (+0900)
Subject: amba-pl011​/dma: Add check for the residue in DMA callback
X-Git-Tag: v3.4-rc1~185^2~106
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6dc01aa65306fe46b7ba38db51fad4ed81c23d00;p=pandora-kernel.git

amba-pl011​/dma: Add check for the residue in DMA callback

In DMA-operated uart, I found that rx data can be taken by the UART
interrupts during the DMA irq handler. pl011_int is occurred just
before it goes inside spin_lock_irq. When it returns to the callback,
DMA buffer already has been flushed. Then, pl011_dma_rx_chars gets
invalid data. So I add check for the residue as the patch bellow.

Signed-off-by: Chanho Min <chanho.min@lge.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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