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Message-ID: <20080630111248.567795df@lxorguk.ukuu.org.uk> 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> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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