linux-kernel - Re: [PATCH] amba-pl011/dma: Add check for the residue in DMA callback

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Message-ID: <CACRpkdZ4fJEBa4uDQ6P3UC50wyWarD-owC3tjC=FRMno-UOk5Q@mail.gmail.com>
Date:	Mon, 20 Feb 2012 09:31:21 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Chanho Min <chanho0207@...il.com>
Cc:	Russell King <linux@....linux.org.uk>,
	Per Forlin <per.friden@...ricsson.com>,
	Alan Cox <alan@...ux.intel.com>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Rabin VINCENT <rabin.vincent@...ricsson.com>
Subject: Re: [PATCH] amba-pl011/dma: Add check for the residue in DMA callback

On Mon, Feb 20, 2012 at 2:24 AM, Chanho Min <chanho0207@...il.com> wrote:

> 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@....com>

Looks correct!
Acked-by: Linus Walleij <linus.walleij@...aro.org>

Thanks,
Linus Walleij
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