console: introduce console_is_registered()

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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

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John Ogness 2022-11-16 17:27:33 +01:06 • committed by Petr Mladek

parent 8cb15f7f49

commit 1fd4224a6b

2 changed files with 29 additions and 1 deletions

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28

include/linux/console.h

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2

kernel/printk/printk.c

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