/* * linux/sound/soc/pxa/z2.c * * SoC Audio driver for Aeronix Zipit Z2 * * Copyright (C) 2009 Ken McGuire * Copyright (C) 2010 Marek Vasut * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "../codecs/wm8750.h" #include "pxa2xx-i2s.h" static struct snd_soc_card snd_soc_z2; static int z2_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct snd_soc_dai *codec_dai = rtd->codec_dai; struct snd_soc_dai *cpu_dai = rtd->cpu_dai; unsigned int clk = 0; int ret = 0; switch (params_rate(params)) { case 8000: case 16000: case 48000: case 96000: clk = 12288000; break; case 11025: case 22050: case 44100: clk = 11289600; break; } /* set the codec system clock for DAC and ADC */ ret = snd_soc_dai_set_sysclk(codec_dai, WM8750_SYSCLK, clk, SND_SOC_CLOCK_IN); if (ret < 0) return ret; /* set the I2S system clock as input (unused) */ ret = snd_soc_dai_set_sysclk(cpu_dai, PXA2XX_I2S_SYSCLK, 0, SND_SOC_CLOCK_IN); if (ret < 0) return ret; return 0; } static struct snd_soc_jack hs_jack; /* Headset jack detection DAPM pins */ static struct snd_soc_jack_pin hs_jack_pins[] = { { .pin = "Mic Jack", .mask = SND_JACK_MICROPHONE, }, { .pin = "Headphone Jack", .mask = SND_JACK_HEADPHONE, }, { .pin = "Ext Spk", .mask = SND_JACK_HEADPHONE, .invert = 1 }, }; /* Headset jack detection gpios */ static struct snd_soc_jack_gpio hs_jack_gpios[] = { { .gpio = GPIO37_ZIPITZ2_HEADSET_DETECT, .name = "hsdet-gpio", .report = SND_JACK_HEADSET, .debounce_time = 200, .invert = 1, }, }; /* z2 machine dapm widgets */ static const struct snd_soc_dapm_widget wm8750_dapm_widgets[] = { SND_SOC_DAPM_HP("Headphone Jack", NULL), SND_SOC_DAPM_MIC("Mic Jack", NULL), SND_SOC_DAPM_SPK("Ext Spk", NULL), /* headset is a mic and mono headphone */ SND_SOC_DAPM_HP("Headset Jack", NULL), }; /* Z2 machine audio_map */ static const struct snd_soc_dapm_route z2_audio_map[] = { /* headphone connected to LOUT1, ROUT1 */ {"Headphone Jack", NULL, "LOUT1"}, {"Headphone Jack", NULL, "ROUT1"}, /* ext speaker connected to LOUT2, ROUT2 */ {"Ext Spk", NULL , "ROUT2"}, {"Ext Spk", NULL , "LOUT2"}, /* mic is connected to R input 2 - with bias */ {"RINPUT2", NULL, "Mic Bias"}, {"Mic Bias", NULL, "Mic Jack"}, }; /* * Logic for a wm8750 as connected on a Z2 Device */ static int z2_wm8750_init(struct snd_soc_pcm_runtime *rtd) { int ret; /* Jack detection API stuff */ ret = snd_soc_card_jack_new(rtd->card, "Headset Jack", SND_JACK_HEADSET, &hs_jack, hs_jack_pins, ARRAY_SIZE(hs_jack_pins)); if (ret) goto err; ret = snd_soc_jack_add_gpios(&hs_jack, ARRAY_SIZE(hs_jack_gpios), hs_jack_gpios); if (ret) goto err; return 0; err: return ret; } static struct snd_soc_ops z2_ops = { .hw_params = z2_hw_params, }; /* z2 digital audio interface glue - connects codec <--> CPU */ static struct snd_soc_dai_link z2_dai = { .name = "wm8750", .stream_name = "WM8750", .cpu_dai_name = "pxa2xx-i2s", .codec_dai_name = "wm8750-hifi", .platform_name = "pxa-pcm-audio", .codec_name = "wm8750.0-001b", .init = z2_wm8750_init, .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS, .ops = &z2_ops, }; /* z2 audio machine driver */ static struct snd_soc_card snd_soc_z2 = { .name = "Z2", .owner = THIS_MODULE, .dai_link = &z2_dai, .num_links = 1, .dapm_widgets = wm8750_dapm_widgets, .num_dapm_widgets = ARRAY_SIZE(wm8750_dapm_widgets), .dapm_routes = z2_audio_map, .num_dapm_routes = ARRAY_SIZE(z2_audio_map), .fully_routed = true, }; static struct platform_device *z2_snd_device; static int __init z2_init(void) { int ret; if (!machine_is_zipit2()) return -ENODEV; z2_snd_device = platform_device_alloc("soc-audio", -1); if (!z2_snd_device) return -ENOMEM; platform_set_drvdata(z2_snd_device, &snd_soc_z2); ret = platform_device_add(z2_snd_device); if (ret) platform_device_put(z2_snd_device); return ret; } static void __exit z2_exit(void) { platform_device_unregister(z2_snd_device); } module_init(z2_init); module_exit(z2_exit); MODULE_AUTHOR("Ken McGuire , " "Marek Vasut "); MODULE_DESCRIPTION("ALSA SoC ZipitZ2"); MODULE_LICENSE("GPL"); d='selected'>unified
authorDouglas Miller <dougmill@linux.vnet.ibm.com>2017-01-28 06:42:20 -0600
committerTejun Heo <tj@kernel.org>2017-01-28 07:49:42 -0500
commit966d2b04e070bc040319aaebfec09e0144dc3341 (patch)
tree4b96156e3d1dd4dfd6039b7c219c9dc4616da52d /sound/soc/kirkwood/kirkwood-i2s.c
parent1b1bc42c1692e9b62756323c675a44cb1a1f9dbd (diff)
percpu-refcount: fix reference leak during percpu-atomic transition
percpu_ref_tryget() and percpu_ref_tryget_live() should return "true" IFF they acquire a reference. But the return value from atomic_long_inc_not_zero() is a long and may have high bits set, e.g. PERCPU_COUNT_BIAS, and the return value of the tryget routines is bool so the reference may actually be acquired but the routines return "false" which results in a reference leak since the caller assumes it does not need to do a corresponding percpu_ref_put(). This was seen when performing CPU hotplug during I/O, as hangs in blk_mq_freeze_queue_wait where percpu_ref_kill (blk_mq_freeze_queue_start) raced with percpu_ref_tryget (blk_mq_timeout_work). Sample stack trace: __switch_to+0x2c0/0x450 __schedule+0x2f8/0x970 schedule+0x48/0xc0 blk_mq_freeze_queue_wait+0x94/0x120 blk_mq_queue_reinit_work+0xb8/0x180 blk_mq_queue_reinit_prepare+0x84/0xa0 cpuhp_invoke_callback+0x17c/0x600 cpuhp_up_callbacks+0x58/0x150 _cpu_up+0xf0/0x1c0 do_cpu_up+0x120/0x150 cpu_subsys_online+0x64/0xe0 device_online+0xb4/0x120 online_store+0xb4/0xc0 dev_attr_store+0x68/0xa0 sysfs_kf_write+0x80/0xb0 kernfs_fop_write+0x17c/0x250 __vfs_write+0x6c/0x1e0 vfs_write+0xd0/0x270 SyS_write+0x6c/0x110 system_call+0x38/0xe0 Examination of the queue showed a single reference (no PERCPU_COUNT_BIAS, and __PERCPU_REF_DEAD, __PERCPU_REF_ATOMIC set) and no requests. However, conditions at the time of the race are count of PERCPU_COUNT_BIAS + 0 and __PERCPU_REF_DEAD and __PERCPU_REF_ATOMIC set. The fix is to make the tryget routines use an actual boolean internally instead of the atomic long result truncated to a int. Fixes: e625305b3907 percpu-refcount: make percpu_ref based on longs instead of ints Link: https://bugzilla.kernel.org/show_bug.cgi?id=190751 Signed-off-by: Douglas Miller <dougmill@linux.vnet.ibm.com> Reviewed-by: Jens Axboe <axboe@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org> Fixes: e625305b3907 ("percpu-refcount: make percpu_ref based on longs instead of ints") Cc: stable@vger.kernel.org # v3.18+
Diffstat (limited to 'sound/soc/kirkwood/kirkwood-i2s.c')