diff options
| author | John Ogness <john.ogness@linutronix.de> | 2022-11-16 17:27:33 +0106 |
|---|---|---|
| committer | Petr Mladek <pmladek@suse.com> | 2022-12-02 11:25:01 +0100 |
| commit | 1fd4224a6b641f1949e27bf350b5b1c1e47e2ccc (patch) | |
| tree | b448d2573cb65c80b2541b6636753c6a8595aa94 /kernel/printk | |
| parent | 8cb15f7f492f85d695a6f4d12044c47230f69d96 (diff) | |
| download | linux-1fd4224a6b641f1949e27bf350b5b1c1e47e2ccc.tar.bz2 | |
console: introduce console_is_registered()
Currently it is not possible for drivers to detect if they have
already successfully registered their console. Several drivers
have multiple paths that lead to console registration. To avoid
attempting a 2nd registration (which leads to a WARN), drivers
are implementing their own solution.
Introduce console_is_registered() so drivers can easily identify
if their console is currently registered. A _locked() variant
is also provided if the caller is already holding the
console_list_lock.
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20221116162152.193147-22-john.ogness@linutronix.de
Diffstat (limited to 'kernel/printk')
| -rw-r--r-- | kernel/printk/printk.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 101d08d9dc88..e58a6ccb945c 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -3443,7 +3443,7 @@ static int unregister_console_locked(struct console *console) /* Disable it unconditionally */ console_srcu_write_flags(console, console->flags & ~CON_ENABLED); - if (hlist_unhashed(&console->node)) { + if (!console_is_registered_locked(console)) { console_unlock(); return -ENODEV; } |