/*
 * max9867.h -- MAX9867 ALSA SoC Audio driver
 *
 * Copyright 2013-2015 Maxim Integrated Products
 *
 * 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.
 */

#ifndef _MAX9867_H
#define _MAX9867_H

/* MAX9867 register space */

#define MAX9867_STATUS        0x00
#define MAX9867_JACKSTATUS   0x01
#define MAX9867_AUXHIGH      0x02
#define MAX9867_AUXLOW       0x03
#define MAX9867_INTEN        0x04
#define MAX9867_SYSCLK       0x05
#define MAX9867_FREQ_MASK    0xF
#define MAX9867_PSCLK_SHIFT  0x4
#define MAX9867_PSCLK_WIDTH  0x2
#define MAX9867_PSCLK_MASK   (0x03<<MAX9867_PSCLK_SHIFT)
#define MAX9867_PSCLK_10_20  0x1
#define MAX9867_PSCLK_20_40  0x2
#define MAX9867_PSCLK_40_60  0x3
#define MAX9867_AUDIOCLKHIGH 0x06
#define MAX9867_NI_HIGH_WIDTH 0x7
#define MAX9867_NI_HIGH_MASK 0x7F
#define MAX9867_NI_LOW_MASK 0x7F
#define MAX9867_NI_LOW_SHIFT 0x1
#define MAX9867_PLL     (1<<7)
#define MAX9867_AUDIOCLKLOW  0x07
#define MAX9867_RAPID_LOCK   0x01
#define MAX9867_IFC1A        0x08
#define MAX9867_MASTER       (1<<7)
#define MAX9867_I2S_DLY      (1<<4)
#define MAX9867_SDOUT_HIZ    (1<<3)
#define MAX9867_TDM_MODE     (1<<2)
#define MAX9867_WCI_MODE     (1<<6)
#define MAX9867_BCI_MODE     (1<<5)
#define MAX9867_IFC1B        0x09
#define MAX9867_IFC1B_BCLK_MASK 7
#define MAX9867_IFC1B_32BIT  0x01
#define MAX9867_IFC1B_24BIT  0x02
#define MAX9867_IFC1B_PCLK_2 4
#define MAX9867_IFC1B_PCLK_4 5
#define MAX9867_IFC1B_PCLK_8 6
#define MAX9867_IFC1B_PCLK_16 7
#define MAX9867_CODECFLTR    0x0a
#define MAX9867_DACGAIN      0x0b
#define MAX9867_DACLEVEL     0x0c
#define MAX9867_DAC_MUTE_SHIFT 0x6
#define MAX9867_DAC_MUTE_WIDTH 0x1
#define MAX9867_DAC_MUTE_MASK (0x1<<MAX9867_DAC_MUTE_SHIFT)
#define MAX9867_ADCLEVEL     0x0d
#define MAX9867_LEFTLINELVL  0x0e
#define MAX9867_RIGTHLINELVL 0x0f
#define MAX9867_LEFTVOL      0x10
#define MAX9867_RIGHTVOL     0x11
#define MAX9867_LEFTMICGAIN  0x12
#define MAX9867_RIGHTMICGAIN 0x13
#define MAX9867_INPUTCONFIG  0x14
#define MAX9867_INPUT_SHIFT  0x6
#define MAX9867_MICCONFIG    0x15
#define MAX9867_MODECONFIG   0x16
#define MAX9867_PWRMAN       0x17
#define MAX9867_SHTDOWN_MASK (1<<7)
#define MAX9867_REVISION     0xff

#define MAX9867_CACHEREGNUM 10

/* codec private data */
struct max9867_priv {
	struct regmap *regmap;
	struct snd_soc_codec *codec;
	unsigned int sysclk;
	unsigned int pclk;
	unsigned int master;
};
#endif
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?id=044950cc48ced25ccb2f4ea7c31228399e19d5d6'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/net?id=044950cc48ced25ccb2f4ea7c31228399e19d5d6'>net</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/ipv6?id=044950cc48ced25ccb2f4ea7c31228399e19d5d6'>ipv6</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/ipv6/ip6_flowlabel.c?id=044950cc48ced25ccb2f4ea7c31228399e19d5d6'>ip6_flowlabel.c</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/net/ipv6/ip6_flowlabel.c?id=044950cc48ced25ccb2f4ea7c31228399e19d5d6&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Douglas Miller &lt;dougmill@linux.vnet.ibm.com&gt;</td><td class='right'>2017-01-28 06:42:20 -0600</td></tr>
<tr><th>committer</th><td>Tejun Heo &lt;tj@kernel.org&gt;</td><td class='right'>2017-01-28 07:49:42 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound?id=966d2b04e070bc040319aaebfec09e0144dc3341'>966d2b04e070bc040319aaebfec09e0144dc3341</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound?id=966d2b04e070bc040319aaebfec09e0144dc3341'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=966d2b04e070bc040319aaebfec09e0144dc3341'>4b96156e3d1dd4dfd6039b7c219c9dc4616da52d</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound?id=966d2b04e070bc040319aaebfec09e0144dc3341'>sound</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound?id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>1b1bc42c1692e9b62756323c675a44cb1a1f9dbd</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound?id=966d2b04e070bc040319aaebfec09e0144dc3341&amp;id2=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>diff</a>)</td></tr></table>
<div class='commit-subject'>percpu-refcount: fix reference leak during percpu-atomic transition</div><div class='commit-msg'>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 &lt;dougmill@linux.vnet.ibm.com&gt;
Reviewed-by: Jens Axboe &lt;axboe@fb.com&gt;
Signed-off-by: Tejun Heo &lt;tj@kernel.org&gt;
Fixes: e625305b3907 ("percpu-refcount: make percpu_ref based on longs instead of ints")
Cc: stable@vger.kernel.org # v3.18+
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=966d2b04e070bc040319aaebfec09e0144dc3341'>Diffstat</a> (limited to 'sound')</div><table summary='diffstat' class='diffstat'>