dummycon: Sprinkle locking checks
As part of trying to understand the locking (or lack thereof) in the fbcon/vt/fbdev maze, annotate everything. Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Reviewed-by: Sam Ravnborg <sam@ravnborg.org> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Cc: Hans de Goede <hdegoede@redhat.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Kees Cook <keescook@chromium.org> Cc: Nicolas Pitre <nicolas.pitre@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20190528090304.9388-2-daniel.vetter@ffwll.ch
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@ -34,6 +34,8 @@ static bool dummycon_putc_called;
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void dummycon_register_output_notifier(struct notifier_block *nb)
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{
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WARN_CONSOLE_UNLOCKED();
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raw_notifier_chain_register(&dummycon_output_nh, nb);
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if (dummycon_putc_called)
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@ -42,11 +44,15 @@ void dummycon_register_output_notifier(struct notifier_block *nb)
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void dummycon_unregister_output_notifier(struct notifier_block *nb)
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{
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WARN_CONSOLE_UNLOCKED();
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raw_notifier_chain_unregister(&dummycon_output_nh, nb);
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}
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static void dummycon_putc(struct vc_data *vc, int c, int ypos, int xpos)
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{
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WARN_CONSOLE_UNLOCKED();
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dummycon_putc_called = true;
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raw_notifier_call_chain(&dummycon_output_nh, 0, NULL);
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}
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