netdev - Re: [PATCH v4 04/11] tty: serdev: Add method to enable break flags

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Date: Mon, 13 May 2024 15:30:31 +0300 (EEST)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Christoph Fritz <christoph.fritz@...dev.de>
cc: Jiri Slaby <jirislaby@...nel.org>, Simon Horman <horms@...nel.org>, 
    Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
    Marc Kleine-Budde <mkl@...gutronix.de>, 
    Oliver Hartkopp <socketcan@...tkopp.net>, 
    Vincent Mailhol <mailhol.vincent@...adoo.fr>, 
    "David S . Miller" <davem@...emloft.net>, 
    Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
    Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh@...nel.org>, 
    Krzysztof Kozlowski <krzk+dt@...nel.org>, 
    Conor Dooley <conor+dt@...nel.org>, Jiri Kosina <jikos@...nel.org>, 
    Benjamin Tissoires <bentiss@...nel.org>, 
    Sebastian Reichel <sre@...nel.org>, 
    Linus Walleij <linus.walleij@...aro.org>, 
    Andreas Lauser <andreas.lauser@...cedes-benz.com>, 
    Jonathan Corbet <corbet@....net>, Pavel Pisa <pisa@....felk.cvut.cz>, 
    linux-can@...r.kernel.org, Netdev <netdev@...r.kernel.org>, 
    devicetree@...r.kernel.org, linux-input@...r.kernel.org, 
    linux-serial <linux-serial@...r.kernel.org>
Subject: Re: [PATCH v4 04/11] tty: serdev: Add method to enable break flags

On Sun, 12 May 2024, Christoph Fritz wrote:

> On Fri, 2024-05-10 at 17:21 +0300, Ilpo Järvinen wrote:
> > On Thu, 9 May 2024, Christoph Fritz wrote:
> ...
> > > diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
> > > index 613cb356b918d..23a1e76cb553b 100644
> > > --- a/drivers/tty/serdev/core.c
> > > +++ b/drivers/tty/serdev/core.c
> > > @@ -339,6 +339,17 @@ unsigned int serdev_device_set_baudrate(struct serdev_device *serdev, unsigned i
> > >  }
> > >  EXPORT_SYMBOL_GPL(serdev_device_set_baudrate);
> > >  
> > > +void serdev_device_set_break_detection(struct serdev_device *serdev, bool enable)
> > > +{
> > > +	struct serdev_controller *ctrl = serdev->ctrl;
> > > +
> > > +	if (!ctrl || !ctrl->ops->set_break_detection)
> > > +		return;
> > 
> > Why you need to test for !ctrl?
> 
> In our case we don't, it's an extra check like all the other functions
> here:
> 
> https://elixir.bootlin.com/linux/v6.9-rc7/source/drivers/tty/serdev/core.c#L330

Okay. It might be I just don't understand all the structs in serdev well 
enough to understand when ctrl actually end ups being NULL so I don't 
object leaving it as is.

-- 
 i.