linux-kernel - Re: [PATCH 1/2] serial: Add flush_buffer() operation to uart

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Date:	Mon, 30 Jun 2008 11:12:48 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
Cc:	linux-kernel@...r.kernel.org, kernel@...32linux.org,
	Andrew Victor <linux@...im.org.za>,
	Chip Coldwell <coldwell@...hat.com>,
	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
Subject: Re: [PATCH 1/2] serial: Add flush_buffer() operation to uart_ops

On Mon, 30 Jun 2008 12:24:20 +0200
Haavard Skinnemoen <haavard.skinnemoen@...el.com> wrote:

> Serial drivers using DMA (like the atmel_serial driver) tend to get very
> confused when the xmit buffer is flushed and nobody told them.  They
> also tend to spew a lot of garbage since the DMA engine keeps running
> after the buffer is flushed and possibly refilled with unrelated data.
> 
> This patch adds a new flush_buffer operation to the uart_ops struct,
> along with a call to it from uart_flush_buffer() right after the xmit
> buffer has been cleared. The driver can implement this in order to
> syncronize its internal DMA state with the xmit buffer when the buffer
> is flushed.
> 
> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@...el.com>

Acked-by: Alan Cox <alan@...hat.com>
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