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Re: [PATCH v3 2/5] tty: Introduce SER_RS485_SOFTWARE read-only flag for struct serial_rs485

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On 11/12/2015 07:41 PM, Andy Shevchenko wrote:
> 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.

How about pause _without_ the possibility to resume?

https://groups.google.com/d/msg/linux.kernel/Abe0hfGcgsw/H0se55wC558J

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[PATCH v3 2/5] tty: Introduce SER_RS485_SOFTWARE read-only flag for struct serial_rs485 "Matwey V. Kornilov" <matwey@sai.msu.ru> - 2015-11-12 15:40 +0100
  Re: [PATCH v3 2/5] tty: Introduce SER_RS485_SOFTWARE read-only flag  for struct serial_rs485 Peter Hurley <peter@hurleysoftware.com> - 2015-11-12 21:30 +0100
    Re: [PATCH v3 2/5] tty: Introduce SER_RS485_SOFTWARE read-only flag  for struct serial_rs485 Andy Shevchenko <andy.shevchenko@gmail.com> - 2015-11-13 01:50 +0100
      Re: [PATCH v3 2/5] tty: Introduce SER_RS485_SOFTWARE read-only flag  for struct serial_rs485 Peter Hurley <peter@hurleysoftware.com> - 2015-11-13 02:20 +0100
        Re: [PATCH v3 2/5] tty: Introduce SER_RS485_SOFTWARE read-only flag  for struct serial_rs485 Andy Shevchenko <andy.shevchenko@gmail.com> - 2015-11-13 02:30 +0100
          Re: [PATCH v3 2/5] tty: Introduce SER_RS485_SOFTWARE read-only flag  for struct serial_rs485 Peter Hurley <peter@hurleysoftware.com> - 2015-11-13 03:00 +0100
    Re: [PATCH v3 2/5] tty: Introduce SER_RS485_SOFTWARE read-only flag  for struct serial_rs485 One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2015-11-14 16:30 +0100
  Re: [PATCH v3 2/5] tty: Introduce SER_RS485_SOFTWARE read-only flag  for struct serial_rs485 One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2015-11-12 21:50 +0100
    Re: [PATCH v3 2/5] tty: Introduce SER_RS485_SOFTWARE read-only flag  for struct serial_rs485 "Matwey V. Kornilov" <matwey@sai.msu.ru> - 2015-11-13 21:10 +0100

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