#ifndef __SOUND_AK4531_CODEC_H #define __SOUND_AK4531_CODEC_H /* * Copyright (c) by Jaroslav Kysela * Universal interface for Audio Codec '97 * * For more details look to AC '97 component specification revision 2.1 * by Intel Corporation (http://developer.intel.com). * * * 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. * * 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. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include #include /* * ASAHI KASEI - AK4531 codec * - not really AC'97 codec, but it uses very similar interface as AC'97 */ /* * AK4531 codec registers */ #define AK4531_LMASTER 0x00 /* master volume left */ #define AK4531_RMASTER 0x01 /* master volume right */ #define AK4531_LVOICE 0x02 /* channel volume left */ #define AK4531_RVOICE 0x03 /* channel volume right */ #define AK4531_LFM 0x04 /* FM volume left */ #define AK4531_RFM 0x05 /* FM volume right */ #define AK4531_LCD 0x06 /* CD volume left */ #define AK4531_RCD 0x07 /* CD volume right */ #define AK4531_LLINE 0x08 /* LINE volume left */ #define AK4531_RLINE 0x09 /* LINE volume right */ #define AK4531_LAUXA 0x0a /* AUXA volume left */ #define AK4531_RAUXA 0x0b /* AUXA volume right */ #define AK4531_MONO1 0x0c /* MONO1 volume left */ #define AK4531_MONO2 0x0d /* MONO1 volume right */ #define AK4531_MIC 0x0e /* MIC volume */ #define AK4531_MONO_OUT 0x0f /* Mono-out volume */ #define AK4531_OUT_SW1 0x10 /* Output mixer switch 1 */ #define AK4531_OUT_SW2 0x11 /* Output mixer switch 2 */ #define AK4531_LIN_SW1 0x12 /* Input left mixer switch 1 */ #define AK4531_RIN_SW1 0x13 /* Input right mixer switch 1 */ #define AK4531_LIN_SW2 0x14 /* Input left mixer switch 2 */ #define AK4531_RIN_SW2 0x15 /* Input right mixer switch 2 */ #define AK4531_RESET 0x16 /* Reset & power down */ #define AK4531_CLOCK 0x17 /* Clock select */ #define AK4531_AD_IN 0x18 /* AD input select */ #define AK4531_MIC_GAIN 0x19 /* MIC amplified gain */ struct snd_ak4531 { void (*write) (struct snd_ak4531 *ak4531, unsigned short reg, unsigned short val); void *private_data; void (*private_free) (struct snd_ak4531 *ak4531); /* --- */ unsigned char regs[0x20]; struct mutex reg_mutex; }; int snd_ak4531_mixer(struct snd_card *card, struct snd_ak4531 *_ak4531, struct snd_ak4531 **rak4531); #ifdef CONFIG_PM void snd_ak4531_suspend(struct snd_ak4531 *ak4531); void snd_ak4531_resume(struct snd_ak4531 *ak4531); #endif #endif /* __SOUND_AK4531_CODEC_H */ /a>/dt-bindings/gpio
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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 /include/dt-bindings/gpio
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 'include/dt-bindings/gpio')