diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2020-02-03 15:31:30 +0200 |
|---|---|---|
| committer | Petr Mladek <pmladek@suse.com> | 2020-02-11 10:44:22 +0100 |
| commit | ed31685c96e18f773ca11dd1a637974d62130673 (patch) | |
| tree | 0cb9fcbf8d3ebb43a1382f6a2ed757547963e2b9 | |
| parent | e78bedbd42b7caa65551f3d56cbff451ccbd0aee (diff) | |
| download | printk-for-5.7-console-exit.tar.gz | |
console: Introduce ->exit() callbackfor-5.7-console-exit
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>
| -rw-r--r-- | include/linux/console.h | 1 | ||||
| -rw-r--r-- | kernel/printk/printk.c | 3 |
2 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/console.h b/include/linux/console.h index d09951d5a94e4a..0cbd2a36aa0028 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 f435a17ef98826..633f41a11d759c 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: |