From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.0 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EC4D5C433DB for ; Tue, 23 Feb 2021 12:13:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B1B9964E00 for ; Tue, 23 Feb 2021 12:13:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232467AbhBWMNa (ORCPT ); Tue, 23 Feb 2021 07:13:30 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56262 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232417AbhBWMNa (ORCPT ); Tue, 23 Feb 2021 07:13:30 -0500 Received: from gofer.mess.org (gofer.mess.org [IPv6:2a02:8011:d000:212::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C7F19C06174A for ; Tue, 23 Feb 2021 04:12:49 -0800 (PST) Received: by gofer.mess.org (Postfix, from userid 1000) id 091B0C63BD; Tue, 23 Feb 2021 12:12:46 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=mess.org; s=2020; t=1614082367; bh=szYDrfd/Twv3JzfO0cEnnMKzARXRrNGP+S07ioLfsfM=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=GUmFi2cF8GgrEDycqoOB8kABVCtogPhFp/tqwEfbm7X8453i7FeVFYdGqBZhJQbZ1 ZX3XNNk97UzTzcSC4Yt2pBUnx6UAT6ICAWArq8On5jpFws9F7BfShdZnBIZUNpL5zF upEGKXkR4a3Bnk8P9hWImEIXBiiESoYnMAdtmSMXwd60E665cdwYBMCXQQ05wKOE57 BhQcuBfaxj19JRKwWgXBM0D58rEPjVwVJvGDmWMyhE6AjgBz3yKczwx70eHlljsSx4 SxE3t4fJ08AhBPHfQVYyXhEul84rdqyJ6gm6ioPzhwEHKxi2yL5E9CgkYd7Pf3g/hH Zbs4W7klyLmbg== Date: Tue, 23 Feb 2021 12:12:46 +0000 From: Sean Young To: Hans Verkuil Cc: Linux Media Mailing List , Hans de Goede Subject: Re: [PATCHv2] media/rc: compile rc-cec.c into rc-core Message-ID: <20210223121246.GA8647@gofer.mess.org> References: <649aae66-ad57-5200-b707-4085b43eddc5@xs4all.nl> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <649aae66-ad57-5200-b707-4085b43eddc5@xs4all.nl> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org On Tue, Feb 23, 2021 at 12:26:28PM +0100, Hans Verkuil wrote: > 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 > Fixes: 2c6d1fffa1d9 (drm: add support for DisplayPort CEC-Tunneling-over-AUX) > Reported-by: Hans de Goede This is correct. The patch isn't not going to win any beauty prizes, but I haven't had any bright ideas of how to do this in a nicer way. Thanks for writing the patch. Acked-by: Sean Young > --- > Change since v1: > Fix copy-and-paste error: rc_core_exit() called rc_map_register() instead > of rc_map_unregister(). > --- > diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile > index 5bb2932ab119..ff6a8fc4c38e 100644 > --- a/drivers/media/rc/Makefile > +++ b/drivers/media/rc/Makefile > @@ -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 > diff --git a/drivers/media/rc/keymaps/Makefile b/drivers/media/rc/keymaps/Makefile > index b252a1d2ebd6..cc6662e1903f 100644 > --- a/drivers/media/rc/keymaps/Makefile > +++ b/drivers/media/rc/keymaps/Makefile > @@ -21,7 +21,6 @@ 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 \ > diff --git a/drivers/media/rc/keymaps/rc-cec.c b/drivers/media/rc/keymaps/rc-cec.c > index 3e3bd11092b4..068e22aeac8c 100644 > --- a/drivers/media/rc/keymaps/rc-cec.c > +++ b/drivers/media/rc/keymaps/rc-cec.c > @@ -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"); > diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c > index 1fd62c1dac76..4768b1e9ffd1 100644 > --- a/drivers/media/rc/rc-main.c > +++ b/drivers/media/rc/rc-main.c > @@ -163,6 +163,10 @@ static struct rc_map_list empty_map = { > } > }; > > +#ifdef CONFIG_MEDIA_CEC_RC > +extern struct rc_map_list cec_map; > +#endif > + > /** > * scancode_to_u64() - converts scancode in &struct input_keymap_entry > * @ke: keymap entry containing scancode to be converted. > @@ -2069,6 +2073,9 @@ 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; > } > @@ -2078,6 +2085,9 @@ 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); > }