linux-kernel - Re: [PATCH v3 5/5] console: Introduce ->exit() callback

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Message-ID: <20200130100103.GR32742@smile.fi.intel.com>
Date:   Thu, 30 Jan 2020 12:01:03 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/5] console: Introduce ->exit() callback

On Thu, Jan 30, 2020 at 10:09:17AM +0100, Petr Mladek wrote:
> On Mon 2020-01-27 13:47:19, Andy Shevchenko wrote:
> > Some consoles might require special operations on unregistering. For example,
> > serial console, when registered in the kernel, keeps power on for entire time,
> > until it gets unregistered. For such cases to have a balance we would provide
> > ->exit() callback.
> 
> Is there any plan to use this callback, please?
> 
> The console init, setup, registration code needs a clean up,
> definitely. If you plan some rework, I would like to understand
> the bigger picture before we start adding new callbacks.

Yes, as mentioned in the commit message I would like to use it for balancing
runtime PM reference counters in the UART code later on.

It will look like:

	->setup():
		pm_runtime_get(...);

	->exit():
		pm_runtime_put(...);

The current operations have no needs to be undone.

-- 
With Best Regards,
Andy Shevchenko