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fbcon: Only defer console takeover if the current console driver is the dummycon

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We rely on dummycon's output notifier mechanism to defer the takeover.

If say vgacon is the current console driver then dummycon will never get
used so its output notifier will also never get called and fbcon never
takes over. This commit fixes this by only deferring the console takeover
if the current console driver is the dummycon driver.

This commit also moves the entirety of fbcon_start under the console_lock,
since the conswitchp which fbcon_start now checks is protected by it.

This commit also inlines fbcon_register_output_notifier, since we now
need a #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER in fbcon_start
anyways because of the write access to the deferred_takeover variable,
this has the added advantage that it puts the
dummycon_register_output_notifier() call directly after the "conswitchp !=
&dummy_con" comparison making it clear why that check is there.

Note the arch setup code will set conswitchp to either dummy_con or
vga_con, in the cases where it gets set to vga_con even though their is
no vga_con present we rely on vga_con_startup() to set conswitchp to
dummy_con. vga_con_startup() is guaranteed to happen before
fb_console_init() as it gets called as a console_initcall where as
fb_console_init() gets called as a subsys_initcall.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
This commit is contained in:
Hans de Goede 2018-08-10 17:23:01 +02:00 committed by Bartlomiej Zolnierkiewicz
parent 15f4c357f9
commit bedb38fc91
1 changed files with 10 additions and 14 deletions
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24
drivers/video/fbdev/core/fbcon.c
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@ -3612,36 +3612,32 @@ static int fbcon_output_notifier(struct notifier_block *nb,
return NOTIFY_OK;
}
static void fbcon_register_output_notifier(void)
{
fbcon_output_nb.notifier_call = fbcon_output_notifier;
dummycon_register_output_notifier(&fbcon_output_nb);
}
#else
static inline void fbcon_register_output_notifier(void) {}
#endif
static void fbcon_start(void)
{
WARN_CONSOLE_UNLOCKED();
#ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
if (conswitchp != &dummy_con)
deferred_takeover = false;
if (deferred_takeover) {
fbcon_register_output_notifier();
fbcon_output_nb.notifier_call = fbcon_output_notifier;
dummycon_register_output_notifier(&fbcon_output_nb);
return;
}
#endif
if (num_registered_fb) {
int i;
console_lock();
for_each_registered_fb(i) {
info_idx = i;
break;
}
do_fbcon_takeover(0);
console_unlock();
}
}
@ -3724,8 +3720,8 @@ void __init fb_console_init(void)
for (i = 0; i < MAX_NR_CONSOLES; i++)
con2fb_map[i] = -1;
console_unlock();
fbcon_start();
console_unlock();
}
#ifdef MODULE