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console: Introduce ->exit() callback

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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>
This commit is contained in:
Andy Shevchenko 2020-02-03 15:31:30 +02:00 committed by Petr Mladek
parent e78bedbd42
commit ed31685c96
2 changed files with 4 additions and 0 deletions
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1
include/linux/console.h
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@ -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;

3
kernel/printk/printk.c
View file

@ -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: