linux-kernel - Re: [PATCH 07/15] tty: serial: 8250_dma: enqueue RX dma again on completion.

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Date:	Fri, 29 Aug 2014 17:52:53 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
CC:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	tony@...mide.com, balbi@...com, Vinod Koul <vinod.koul@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 07/15] tty: serial: 8250_dma: enqueue RX dma again on
 completion.

On 08/18/2014 12:52 PM, One Thousand Gnomes wrote:
> 
>>  		if (!up->dma || dma_err)
>>  			status = serial8250_rx_chars(up, status);
>> +
>> +		if (dma_err && port->type == PORT_OMAP_16750)
>> +			serial8250_rx_dma(up, 0);
> 
> Can we stick to a 'has dma' flag and port->rx_dma() type usages so that
> we don't have to rewrite it again to add them the next slightly odd DMA
> user we add 8)

I hide this behind a bug flag, something like UART_NEEDS_DMA_RX_PENDING.

Sebastian
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