/* * SiRF audio card driver * * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company. * * Licensed under GPLv2 or later. */ #include #include #include #include #include #include #include #include struct sirf_audio_card { unsigned int gpio_hp_pa; unsigned int gpio_spk_pa; }; static int sirf_audio_hp_event(struct snd_soc_dapm_widget *w, struct snd_kcontrol *ctrl, int event) { struct snd_soc_dapm_context *dapm = w->dapm; struct snd_soc_card *card = dapm->card; struct sirf_audio_card *sirf_audio_card = snd_soc_card_get_drvdata(card); int on = !SND_SOC_DAPM_EVENT_OFF(event); if (gpio_is_valid(sirf_audio_card->gpio_hp_pa)) gpio_set_value(sirf_audio_card->gpio_hp_pa, on); return 0; } static int sirf_audio_spk_event(struct snd_soc_dapm_widget *w, struct snd_kcontrol *ctrl, int event) { struct snd_soc_dapm_context *dapm = w->dapm; struct snd_soc_card *card = dapm->card; struct sirf_audio_card *sirf_audio_card = snd_soc_card_get_drvdata(card); int on = !SND_SOC_DAPM_EVENT_OFF(event); if (gpio_is_valid(sirf_audio_card->gpio_spk_pa)) gpio_set_value(sirf_audio_card->gpio_spk_pa, on); return 0; } static const struct snd_soc_dapm_widget sirf_audio_dapm_widgets[] = { SND_SOC_DAPM_HP("Hp", sirf_audio_hp_event), SND_SOC_DAPM_SPK("Ext Spk", sirf_audio_spk_event), SND_SOC_DAPM_MIC("Ext Mic", NULL), }; static const struct snd_soc_dapm_route intercon[] = { {"Hp", NULL, "HPOUTL"}, {"Hp", NULL, "HPOUTR"}, {"Ext Spk", NULL, "SPKOUT"}, {"MICIN1", NULL, "Mic Bias"}, {"Mic Bias", NULL, "Ext Mic"}, }; /* Digital audio interface glue - connects codec <--> CPU */ static struct snd_soc_dai_link sirf_audio_dai_link[] = { { .name = "SiRF audio card", .stream_name = "SiRF audio HiFi", .codec_dai_name = "sirf-audio-codec", }, }; /* Audio machine driver */ static struct snd_soc_card snd_soc_sirf_audio_card = { .name = "SiRF audio card", .owner = THIS_MODULE, .dai_link = sirf_audio_dai_link, .num_links = ARRAY_SIZE(sirf_audio_dai_link), .dapm_widgets = sirf_audio_dapm_widgets, .num_dapm_widgets = ARRAY_SIZE(sirf_audio_dapm_widgets), .dapm_routes = intercon, .num_dapm_routes = ARRAY_SIZE(intercon), }; static int sirf_audio_probe(struct platform_device *pdev) { struct snd_soc_card *card = &snd_soc_sirf_audio_card; struct sirf_audio_card *sirf_audio_card; int ret; sirf_audio_card = devm_kzalloc(&pdev->dev, sizeof(struct sirf_audio_card), GFP_KERNEL); if (sirf_audio_card == NULL) return -ENOMEM; sirf_audio_dai_link[0].cpu_of_node = of_parse_phandle(pdev->dev.of_node, "sirf,audio-platform", 0); sirf_audio_dai_link[0].platform_of_node = of_parse_phandle(pdev->dev.of_node, "sirf,audio-platform", 0); sirf_audio_dai_link[0].codec_of_node = of_parse_phandle(pdev->dev.of_node, "sirf,audio-codec", 0); sirf_audio_card->gpio_spk_pa = of_get_named_gpio(pdev->dev.of_node, "spk-pa-gpios", 0); sirf_audio_card->gpio_hp_pa = of_get_named_gpio(pdev->dev.of_node, "hp-pa-gpios", 0); if (gpio_is_valid(sirf_audio_card->gpio_spk_pa)) { ret = devm_gpio_request_one(&pdev->dev, sirf_audio_card->gpio_spk_pa, GPIOF_OUT_INIT_LOW, "SPA_PA_SD"); if (ret) { dev_err(&pdev->dev, "Failed to request GPIO_%d for reset: %d\n", sirf_audio_card->gpio_spk_pa, ret); return ret; } } if (gpio_is_valid(sirf_audio_card->gpio_hp_pa)) { ret = devm_gpio_request_one(&pdev->dev, sirf_audio_card->gpio_hp_pa, GPIOF_OUT_INIT_LOW, "HP_PA_SD"); if (ret) { dev_err(&pdev->dev, "Failed to request GPIO_%d for reset: %d\n", sirf_audio_card->gpio_hp_pa, ret); return ret; } } card->dev = &pdev->dev; snd_soc_card_set_drvdata(card, sirf_audio_card); ret = devm_snd_soc_register_card(&pdev->dev, card); if (ret) dev_err(&pdev->dev, "snd_soc_register_card() failed:%d\n", ret); return ret; } static const struct of_device_id sirf_audio_of_match[] = { {.compatible = "sirf,sirf-audio-card", }, { }, }; MODULE_DEVICE_TABLE(of, sirf_audio_of_match); static struct platform_driver sirf_audio_driver = { .driver = { .name = "sirf-audio-card", .pm = &snd_soc_pm_ops, .of_match_table = sirf_audio_of_match, }, .probe = sirf_audio_probe, }; module_platform_driver(sirf_audio_driver); MODULE_AUTHOR("RongJun Ying "); MODULE_DESCRIPTION("ALSA SoC SIRF audio card driver"); MODULE_LICENSE("GPL v2"); emode:
authorTejun Heo <tj@kernel.org>2017-01-26 16:47:28 -0500
committerTejun Heo <tj@kernel.org>2017-01-26 16:47:28 -0500
commit07cd12945551b63ecb1a349d50a6d69d1d6feb4a (patch)
tree75f65eba7eac9277971082a2d5a4cf1370562c0c /sound/oss/README.FIRST
parent7ce7d89f48834cefece7804d38fc5d85382edf77 (diff)
cgroup: don't online subsystems before cgroup_name/path() are operational
While refactoring cgroup creation, a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") incorrectly onlined subsystems before the new cgroup is associated with it kernfs_node. This is fine for cgroup proper but cgroup_name/path() depend on the associated kernfs_node and if a subsystem makes the new cgroup_subsys_state visible, which they're allowed to after onlining, it can lead to NULL dereference. The current code performs cgroup creation and subsystem onlining in cgroup_create() and cgroup_mkdir() makes the cgroup and subsystems visible afterwards. There's no reason to online the subsystems early and we can simply drop cgroup_apply_control_enable() call from cgroup_create() so that the subsystems are onlined and made visible at the same time. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Fixes: a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") Cc: stable@vger.kernel.org # v4.6+
Diffstat (limited to 'sound/oss/README.FIRST')