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authorDaniel Vetter <daniel.vetter@ffwll.ch>2019-05-28 11:02:32 +0200
committerDaniel Vetter <daniel.vetter@ffwll.ch>2019-06-12 20:26:55 +0200
commit214b0dd591abfde8cbc5536cd0a6b996a659c23e (patch)
tree3db99107fb45cbd609c8d77827e634fcec8255cb /drivers/video
parentd1fdb6d8f6a4109a4263176c84b899076a5f8008 (diff)
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
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/console/dummycon.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/video/console/dummycon.c b/drivers/video/console/dummycon.c
index ff886e99104b..2a0d0bda7faa 100644
--- a/drivers/video/console/dummycon.c
+++ b/drivers/video/console/dummycon.c
@@ -34,6 +34,8 @@ static bool dummycon_putc_called;
void dummycon_register_output_notifier(struct notifier_block *nb)
{
+ WARN_CONSOLE_UNLOCKED();
+
raw_notifier_chain_register(&dummycon_output_nh, nb);
if (dummycon_putc_called)
@@ -42,11 +44,15 @@ void dummycon_register_output_notifier(struct notifier_block *nb)
void dummycon_unregister_output_notifier(struct notifier_block *nb)
{
+ WARN_CONSOLE_UNLOCKED();
+
raw_notifier_chain_unregister(&dummycon_output_nh, nb);
}
static void dummycon_putc(struct vc_data *vc, int c, int ypos, int xpos)
{
+ WARN_CONSOLE_UNLOCKED();
+
dummycon_putc_called = true;
raw_notifier_call_chain(&dummycon_output_nh, 0, NULL);
}