/* * Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * lpass-ipq806x.c -- ALSA SoC CPU DAI driver for QTi LPASS * Splited out the IPQ8064 soc specific from lpass-cpu.c */ #include #include #include #include #include #include #include #include #include #include #include "lpass-lpaif-reg.h" #include "lpass.h" enum lpaif_i2s_ports { IPQ806X_LPAIF_I2S_PORT_CODEC_SPK, IPQ806X_LPAIF_I2S_PORT_CODEC_MIC, IPQ806X_LPAIF_I2S_PORT_SEC_SPK, IPQ806X_LPAIF_I2S_PORT_SEC_MIC, IPQ806X_LPAIF_I2S_PORT_MI2S, }; enum lpaif_dma_channels { IPQ806X_LPAIF_RDMA_CHAN_MI2S, IPQ806X_LPAIF_RDMA_CHAN_PCM0, IPQ806X_LPAIF_RDMA_CHAN_PCM1, }; static struct snd_soc_dai_driver ipq806x_lpass_cpu_dai_driver = { .id = IPQ806X_LPAIF_I2S_PORT_MI2S, .playback = { .stream_name = "lpass-cpu-playback", .formats = SNDRV_PCM_FMTBIT_S16 | SNDRV_PCM_FMTBIT_S24 | SNDRV_PCM_FMTBIT_S32, .rates = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000, .rate_min = 8000, .rate_max = 96000, .channels_min = 1, .channels_max = 8, }, .probe = &asoc_qcom_lpass_cpu_dai_probe, .ops = &asoc_qcom_lpass_cpu_dai_ops, }; static int ipq806x_lpass_alloc_dma_channel(struct lpass_data *drvdata, int dir) { if (dir == SNDRV_PCM_STREAM_PLAYBACK) return IPQ806X_LPAIF_RDMA_CHAN_MI2S; else /* Capture currently not implemented */ return -EINVAL; } static int ipq806x_lpass_free_dma_channel(struct lpass_data *drvdata, int chan) { return 0; } static struct lpass_variant ipq806x_data = { .i2sctrl_reg_base = 0x0010, .i2sctrl_reg_stride = 0x04, .i2s_ports = 5, .irq_reg_base = 0x3000, .irq_reg_stride = 0x1000, .irq_ports = 3, .rdma_reg_base = 0x6000, .rdma_reg_stride = 0x1000, .rdma_channels = 4, .wrdma_reg_base = 0xB000, .wrdma_reg_stride = 0x1000, .wrdma_channel_start = 5, .wrdma_channels = 4, .dai_driver = &ipq806x_lpass_cpu_dai_driver, .num_dai = 1, .alloc_dma_channel = ipq806x_lpass_alloc_dma_channel, .free_dma_channel = ipq806x_lpass_free_dma_channel, }; static const struct of_device_id ipq806x_lpass_cpu_device_id[] = { { .compatible = "qcom,lpass-cpu", .data = &ipq806x_data }, {} }; MODULE_DEVICE_TABLE(of, ipq806x_lpass_cpu_device_id); static struct platform_driver ipq806x_lpass_cpu_platform_driver = { .driver = { .name = "lpass-cpu", .of_match_table = of_match_ptr(ipq806x_lpass_cpu_device_id), }, .probe = asoc_qcom_lpass_cpu_platform_probe, .remove = asoc_qcom_lpass_cpu_platform_remove, }; module_platform_driver(ipq806x_lpass_cpu_platform_driver); MODULE_DESCRIPTION("QTi LPASS CPU Driver"); MODULE_LICENSE("GPL v2"); .git/commit/tools/build/feature/test-libpython-version.c?id=966d2b04e070bc040319aaebfec09e0144dc3341'>test-libpython-version.c
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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 /tools/build/feature/test-libpython-version.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 'tools/build/feature/test-libpython-version.c')