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console: Avoid positive return code from unregister_console()

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There are only two callers that use the returned code from
unregister_console():

  - unregister_early_console() in arch/m68k/kernel/early_printk.c
  - kgdb_unregister_nmi_console() in drivers/tty/serial/kgdb_nmi.c

They both expect to get "0" on success and a non-zero value on error.
But the current behavior is confusing and buggy:

  - _braille_unregister_console() returns "1" on success
  - unregister_console() returns "1" on error

Fix and clean up the behavior:

  - Return success when _braille_unregister_console() succeeded
  - Return a meaningful error code when the console was
    not registered before

Link: http://lkml.kernel.org/r/20200203133130.11591-5-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>
Signed-off-by: Petr Mladek <pmladek@suse.com>
This commit is contained in:
Andy Shevchenko 2020-02-03 15:31:28 +02:00 committed by Petr Mladek
parent d58ad10122
commit bb72e3981d
1 changed files with 4 additions and 2 deletions
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6
kernel/printk/printk.c
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@ -2816,10 +2816,12 @@ int unregister_console(struct console *console)
console->name, console->index);
res = _braille_unregister_console(console);
if (res)
if (res < 0)
return res;
if (res > 0)
return 0;
res = 1;
res = -ENODEV;
console_lock();
if (console_drivers == console) {
console_drivers=console->next;