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fbcon: Consistently protect deferred_takeover with console_lock()

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[ Upstream commit 4355355912 ]

This shouldn't be a problem in practice since until we've actually
taken over the console there's nothing we've registered with the
console/vt subsystem, so the exit/unbind path that check this can't
do the wrong thing. But it's confusing, so fix it by moving it a tad
later.

Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Du Cheng <ducheng2@gmail.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Claudio Suarez <cssk@net-c.es>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220405210335.3434130-14-daniel.vetter@ffwll.ch
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Daniel Vetter 2022-04-05 23:03:31 +02:00 committed by Greg Kroah-Hartman
parent 3d972015dd
commit a52f4ba821
1 changed files with 3 additions and 2 deletions
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5
drivers/video/fbdev/core/fbcon.c
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@ -3265,6 +3265,9 @@ static void fbcon_register_existing_fbs(struct work_struct *work)
console_lock();
deferred_takeover = false;
logo_shown = FBCON_LOGO_DONTSHOW;
for_each_registered_fb(i)
fbcon_fb_registered(registered_fb[i]);
@ -3282,8 +3285,6 @@ static int fbcon_output_notifier(struct notifier_block *nb,
pr_info("fbcon: Taking over console\n");
dummycon_unregister_output_notifier(&fbcon_output_nb);
deferred_takeover = false;
logo_shown = FBCON_LOGO_DONTSHOW;
/* We may get called in atomic context */
schedule_work(&fbcon_deferred_takeover_work);