/*
 * Definitions for AUO-K190X framebuffer drivers
 *
 * Copyright (C) 2012 Heiko Stuebner <heiko@sntech.de>
 *
 * 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 _LINUX_VIDEO_AUO_K190XFB_H_
#define _LINUX_VIDEO_AUO_K190XFB_H_

/* Controller standby command needs a param */
#define AUOK190X_QUIRK_STANDBYPARAM	(1 << 0)

/* Controller standby is completely broken */
#define AUOK190X_QUIRK_STANDBYBROKEN	(1 << 1)

/*
 * Resolutions for the displays
 */
#define AUOK190X_RESOLUTION_800_600		0
#define AUOK190X_RESOLUTION_1024_768		1
#define AUOK190X_RESOLUTION_600_800		4
#define AUOK190X_RESOLUTION_768_1024		5

/*
 * struct used by auok190x. board specific stuff comes from *board
 */
struct auok190xfb_par {
	struct fb_info *info;
	struct auok190x_board *board;

	struct regulator *regulator;

	struct mutex io_lock;
	struct delayed_work work;
	wait_queue_head_t waitq;
	int resolution;
	int rotation;
	int consecutive_threshold;
	int update_cnt;

	/* panel and controller informations */
	int epd_type;
	int panel_size_int;
	int panel_size_float;
	int panel_model;
	int tcon_version;
	int lut_version;

	/* individual controller callbacks */
	void (*update_partial)(struct auok190xfb_par *par, u16 y1, u16 y2);
	void (*update_all)(struct auok190xfb_par *par);
	bool (*need_refresh)(struct auok190xfb_par *par);
	void (*init)(struct auok190xfb_par *par);
	void (*recover)(struct auok190xfb_par *par);

	int update_mode; /* mode to use for updates */
	int last_mode; /* update mode last used */
	int flash;

	/* power management */
	int autosuspend_delay;
	bool standby;
	bool manual_standby;
};

/**
 * Board specific platform-data
 * @init:		initialize the controller interface
 * @cleanup:		cleanup the controller interface
 * @wait_for_rdy:	wait until the controller is not busy anymore
 * @set_ctl:		change an interface control
 * @set_hdb:		write a value to the data register
 * @get_hdb:		read a value from the data register
 * @setup_irq:		method to setup the irq handling on the busy gpio
 * @gpio_nsleep:	sleep gpio
 * @gpio_nrst:		reset gpio
 * @gpio_nbusy:		busy gpio
 * @resolution:		one of the AUOK190X_RESOLUTION constants
 * @rotation:		rotation of the framebuffer
 * @quirks:		controller quirks to honor
 * @fps:		frames per second for defio
 */
struct auok190x_board {
	int (*init)(struct auok190xfb_par *);
	void (*cleanup)(struct auok190xfb_par *);
	int (*wait_for_rdy)(struct auok190xfb_par *);

	void (*set_ctl)(struct auok190xfb_par *, unsigned char, u8);
	void (*set_hdb)(struct auok190xfb_par *, u16);
	u16 (*get_hdb)(struct auok190xfb_par *);

	int (*setup_irq)(struct fb_info *);

	int gpio_nsleep;
	int gpio_nrst;
	int gpio_nbusy;

	int resolution;
	int quirks;
	int fps;
};

#endif
gi/linux/net-next.git/commit/net/ipv6?id=966d2b04e070bc040319aaebfec09e0144dc3341'>ipv6</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/ipv6/icmp.c?id=966d2b04e070bc040319aaebfec09e0144dc3341'>icmp.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='966d2b04e070bc040319aaebfec09e0144dc3341'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option 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/net/ipv6/icmp.c?id=966d2b04e070bc040319aaebfec09e0144dc3341'>966d2b04e070bc040319aaebfec09e0144dc3341</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/ipv6/icmp.c?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/net/ipv6/icmp.c?id=966d2b04e070bc040319aaebfec09e0144dc3341'>net/ipv6/icmp.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/ipv6/icmp.c?id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>1b1bc42c1692e9b62756323c675a44cb1a1f9dbd</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/ipv6/icmp.c?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 'net/ipv6/icmp.c')</div><table summary='diffstat' class='diffstat'>