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media: rc: compile rc-cec.c into rc-core

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commit f09f9f93af upstream.

The rc-cec keymap is unusual in that it can't be built as a module,
instead it is registered directly in rc-main.c if CONFIG_MEDIA_CEC_RC
is set. This is because it can be called from drm_dp_cec_set_edid() via
cec_register_adapter() in an asynchronous context, and it is not
allowed to use request_module() to load rc-cec.ko in that case. Trying to
do so results in a 'WARN_ON_ONCE(wait && current_is_async())'.

Since this keymap is only used if CONFIG_MEDIA_CEC_RC is set, we
just compile this keymap into the rc-core module and never as a
separate module.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Fixes: 2c6d1fffa1 (drm: add support for DisplayPort CEC-Tunneling-over-AUX)
Reported-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans Verkuil 2021-02-26 11:37:47 +01:00 committed by Greg Kroah-Hartman
parent 4c0c31572b
commit cb36bf447a
5 changed files with 25 additions and 18 deletions
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1
drivers/media/rc/Makefile
View File

@ -5,6 +5,7 @@ obj-y += keymaps/
obj-$(CONFIG_RC_CORE) += rc-core.o
rc-core-y := rc-main.o rc-ir-raw.o
rc-core-$(CONFIG_LIRC) += lirc_dev.o
rc-core-$(CONFIG_MEDIA_CEC_RC) += keymaps/rc-cec.o
rc-core-$(CONFIG_BPF_LIRC_MODE2) += bpf-lirc.o
obj-$(CONFIG_IR_NEC_DECODER) += ir-nec-decoder.o
obj-$(CONFIG_IR_RC5_DECODER) += ir-rc5-decoder.o

1
drivers/media/rc/keymaps/Makefile
View File

@ -20,7 +20,6 @@ obj-$(CONFIG_RC_MAP) += rc-adstech-dvb-t-pci.o \
rc-behold.o \
rc-behold-columbus.o \
rc-budget-ci-old.o \
rc-cec.o \
rc-cinergy-1400.o \
rc-cinergy.o \
rc-d680-dmb.o \

28
drivers/media/rc/keymaps/rc-cec.c
View File

@ -1,5 +1,15 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/* Keytable for the CEC remote control
*
* This keymap is unusual in that it can't be built as a module,
* instead it is registered directly in rc-main.c if CONFIG_MEDIA_CEC_RC
* is set. This is because it can be called from drm_dp_cec_set_edid() via
* cec_register_adapter() in an asynchronous context, and it is not
* allowed to use request_module() to load rc-cec.ko in that case.
*
* Since this keymap is only used if CONFIG_MEDIA_CEC_RC is set, we
* just compile this keymap into the rc-core module and never as a
* separate module.
*
* Copyright (c) 2015 by Kamil Debski
*/
@ -152,7 +162,7 @@ static struct rc_map_table cec[] = {
/* 0x77-0xff: Reserved */
};
static struct rc_map_list cec_map = {
struct rc_map_list cec_map = {
.map = {
.scan = cec,
.size = ARRAY_SIZE(cec),
@ -160,19 +170,3 @@ static struct rc_map_list cec_map = {
.name = RC_MAP_CEC,
}
};
static int __init init_rc_map_cec(void)
{
return rc_map_register(&cec_map);
}
static void __exit exit_rc_map_cec(void)
{
rc_map_unregister(&cec_map);
}
module_init(init_rc_map_cec);
module_exit(exit_rc_map_cec);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Kamil Debski");

6
drivers/media/rc/rc-main.c
View File

@ -2033,6 +2033,9 @@ static int __init rc_core_init(void)
led_trigger_register_simple("rc-feedback", &led_feedback);
rc_map_register(&empty_map);
#ifdef CONFIG_MEDIA_CEC_RC
rc_map_register(&cec_map);
#endif
return 0;
}
@ -2042,6 +2045,9 @@ static void __exit rc_core_exit(void)
lirc_dev_exit();
class_unregister(&rc_class);
led_trigger_unregister_simple(led_feedback);
#ifdef CONFIG_MEDIA_CEC_RC
rc_map_unregister(&cec_map);
#endif
rc_map_unregister(&empty_map);
}

7
include/media/rc-map.h
View File

@ -126,6 +126,13 @@ struct rc_map_list {
struct rc_map map;
};
#ifdef CONFIG_MEDIA_CEC_RC
/*
* rc_map_list from rc-cec.c
*/
extern struct rc_map_list cec_map;
#endif
/* Routines from rc-map.c */
/**