Messages in this thread | | | Date | Fri, 13 Nov 2015 02:41:55 +0200 | Subject | Re: [PATCH v3 2/5] tty: Introduce SER_RS485_SOFTWARE read-only flag for struct serial_rs485 | From | Andy Shevchenko <> |
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On Thu, Nov 12, 2015 at 10:22 PM, Peter Hurley <peter@hurleysoftware.com> wrote: > On 11/12/2015 02:57 PM, One Thousand Gnomes wrote:
> An illustrative (kernel-space) example is the mess that is dmaengine_pause(). > Some DMA implementations provide the means to stop and restart DMA without > losing data and some DMA implementations do not. Unfortunately, some > advertise they support dmaengine_pause() but only for lossy uses like audio. > Because the api hides this, the query interface for pause support is > useless.
The DMA pause() call means only pause with possibility to resume. There is a resume() call as well. Any driver which treats pause() as a complete stop is buggy driver and should be fixed.
-- With Best Regards, Andy Shevchenko
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