/* * linux/sound/soc/pxa/brownstone.c * * Copyright (C) 2011 Marvell International Ltd. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * */ #include #include #include #include #include #include "../codecs/wm8994.h" #include "mmp-sspa.h" static const struct snd_kcontrol_new brownstone_dapm_control[] = { SOC_DAPM_PIN_SWITCH("Ext Spk"), }; static const struct snd_soc_dapm_widget brownstone_dapm_widgets[] = { SND_SOC_DAPM_SPK("Ext Spk", NULL), SND_SOC_DAPM_HP("Headset Stereophone", NULL), SND_SOC_DAPM_MIC("Headset Mic", NULL), SND_SOC_DAPM_MIC("Main Mic", NULL), }; static const struct snd_soc_dapm_route brownstone_audio_map[] = { {"Ext Spk", NULL, "SPKOUTLP"}, {"Ext Spk", NULL, "SPKOUTLN"}, {"Ext Spk", NULL, "SPKOUTRP"}, {"Ext Spk", NULL, "SPKOUTRN"}, {"Headset Stereophone", NULL, "HPOUT1L"}, {"Headset Stereophone", NULL, "HPOUT1R"}, {"IN1RN", NULL, "Headset Mic"}, {"DMIC1DAT", NULL, "MICBIAS1"}, {"MICBIAS1", NULL, "Main Mic"}, }; static int brownstone_wm8994_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; int freq_out, sspa_mclk, sysclk; if (params_rate(params) > 11025) { freq_out = params_rate(params) * 512; sysclk = params_rate(params) * 256; sspa_mclk = params_rate(params) * 64; } else { freq_out = params_rate(params) * 1024; sysclk = params_rate(params) * 512; sspa_mclk = params_rate(params) * 64; } snd_soc_dai_set_sysclk(cpu_dai, MMP_SSPA_CLK_AUDIO, freq_out, 0); snd_soc_dai_set_pll(cpu_dai, MMP_SYSCLK, 0, freq_out, sysclk); snd_soc_dai_set_pll(cpu_dai, MMP_SSPA_CLK, 0, freq_out, sspa_mclk); /* set wm8994 sysclk */ snd_soc_dai_set_sysclk(codec_dai, WM8994_SYSCLK_MCLK1, sysclk, 0); return 0; } /* machine stream operations */ static struct snd_soc_ops brownstone_ops = { .hw_params = brownstone_wm8994_hw_params, }; static struct snd_soc_dai_link brownstone_wm8994_dai[] = { { .name = "WM8994", .stream_name = "WM8994 HiFi", .cpu_dai_name = "mmp-sspa-dai.0", .codec_dai_name = "wm8994-aif1", .platform_name = "mmp-pcm-audio", .codec_name = "wm8994-codec", .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS, .ops = &brownstone_ops, }, }; /* audio machine driver */ static struct snd_soc_card brownstone = { .name = "brownstone", .owner = THIS_MODULE, .dai_link = brownstone_wm8994_dai, .num_links = ARRAY_SIZE(brownstone_wm8994_dai), .controls = brownstone_dapm_control, .num_controls = ARRAY_SIZE(brownstone_dapm_control), .dapm_widgets = brownstone_dapm_widgets, .num_dapm_widgets = ARRAY_SIZE(brownstone_dapm_widgets), .dapm_routes = brownstone_audio_map, .num_dapm_routes = ARRAY_SIZE(brownstone_audio_map), .fully_routed = true, }; static int brownstone_probe(struct platform_device *pdev) { int ret; brownstone.dev = &pdev->dev; ret = devm_snd_soc_register_card(&pdev->dev, &brownstone); if (ret) dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", ret); return ret; } static struct platform_driver mmp_driver = { .driver = { .name = "brownstone-audio", .pm = &snd_soc_pm_ops, }, .probe = brownstone_probe, }; module_platform_driver(mmp_driver); MODULE_AUTHOR("Leo Yan "); MODULE_DESCRIPTION("ALSA SoC Brownstone"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:brownstone-audio"); 1'>1space:mode:
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 /drivers/usb/gadget/udc/omap_udc.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 'drivers/usb/gadget/udc/omap_udc.c')