From ed31685c96e18f773ca11dd1a637974d62130673 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Mon, 3 Feb 2020 15:31:30 +0200 Subject: [PATCH] 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 Signed-off-by: Andy Shevchenko Reviewed-by: Sergey Senozhatsky Reviewed-by: Petr Mladek Signed-off-by: Petr Mladek --- include/linux/console.h | 1 + kernel/printk/printk.c | 3 +++ 2 files changed, 4 insertions(+) diff --git a/include/linux/console.h b/include/linux/console.h index d09951d5a94e..0cbd2a36aa00 100644 --- a/include/linux/console.h +++ b/include/linux/console.h @@ -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; diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index f435a17ef988..633f41a11d75 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -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: