#ifndef __SOUND_TEA575X_TUNER_H #define __SOUND_TEA575X_TUNER_H /* * ALSA driver for TEA5757/5759 Philips AM/FM tuner chips * * Copyright (c) 2004 Jaroslav Kysela * * 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 #include #include #define TEA575X_FMIF 10700 #define TEA575X_AMIF 450 #define TEA575X_DATA (1 << 0) #define TEA575X_CLK (1 << 1) #define TEA575X_WREN (1 << 2) #define TEA575X_MOST (1 << 3) struct snd_tea575x; struct snd_tea575x_ops { /* Drivers using snd_tea575x must either define read_ and write_val */ void (*write_val)(struct snd_tea575x *tea, u32 val); u32 (*read_val)(struct snd_tea575x *tea); /* Or define the 3 pin functions */ void (*set_pins)(struct snd_tea575x *tea, u8 pins); u8 (*get_pins)(struct snd_tea575x *tea); void (*set_direction)(struct snd_tea575x *tea, bool output); }; struct snd_tea575x { struct v4l2_device *v4l2_dev; struct v4l2_file_operations fops; struct video_device vd; /* video device */ int radio_nr; /* radio_nr */ bool tea5759; /* 5759 chip is present */ bool has_am; /* Device can tune to AM freqs */ bool cannot_read_data; /* Device cannot read the data pin */ bool cannot_mute; /* Device cannot mute */ bool mute; /* Device is muted? */ bool stereo; /* receiving stereo */ bool tuned; /* tuned to a station */ unsigned int val; /* hw value */ u32 band; /* 0: FM, 1: FM-Japan, 2: AM */ u32 freq; /* frequency */ struct mutex mutex; const struct snd_tea575x_ops *ops; void *private_data; u8 card[32]; u8 bus_info[32]; struct v4l2_ctrl_handler ctrl_handler; int (*ext_init)(struct snd_tea575x *tea); }; int snd_tea575x_enum_freq_bands(struct snd_tea575x *tea, struct v4l2_frequency_band *band); int snd_tea575x_g_tuner(struct snd_tea575x *tea, struct v4l2_tuner *v); int snd_tea575x_s_hw_freq_seek(struct file *file, struct snd_tea575x *tea, const struct v4l2_hw_freq_seek *a); int snd_tea575x_hw_init(struct snd_tea575x *tea); int snd_tea575x_init(struct snd_tea575x *tea, struct module *owner); void snd_tea575x_exit(struct snd_tea575x *tea); void snd_tea575x_set_freq(struct snd_tea575x *tea); #endif /* __SOUND_TEA575X_TUNER_H */ -next.git/commit/include?id=966d2b04e070bc040319aaebfec09e0144dc3341'>include/dt-bindings/regulator/maxim,max77802.h
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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/regulator/maxim,max77802.h
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/regulator/maxim,max77802.h')