Commit ed31685c authored Feb 03, 2020 by Andy Shevchenko Committed by Petr Mladek Feb 11, 2020

console: Introduce ->exit() callback

Some consoles might require special operations on unregistering.
For instance, serial console, when registered in the kernel,
keeps power on for entire time, until it gets unregistered.
Example of use:

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

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

For such cases to have a balance we would provide ->exit() callback.

Link: http://lkml.kernel.org/r/20200203133130.11591-7-andriy.shevchenko@linux.intel.com


To: linux-kernel@vger.kernel.org
To: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>

parent e78bedbd

include/linux/console.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -149,6 +149,7 @@ struct console {
		struct tty_driver (device)(struct console , int );
		void (*unblank)(void);
		int (setup)(struct console , char *);
		int (exit)(struct console );
		int (match)(struct console , char name, int idx, char options);
		short flags;
		short index;

kernel/printk/printk.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -2853,6 +2853,9 @@ int unregister_console(struct console *console)
		console_unlock();
		console_sysfs_notify();

		if (console->exit)
		res = console->exit(console);

		return res;

		out_disable_unlock:

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