/*
 *  GOVR registers list for WM8505 chips
 *
 *  Copyright (C) 2010 Ed Spiridonov <edo.rus@gmail.com>
 *   Based on VIA/WonderMedia wm8510-govrh-reg.h
 *   http://github.com/projectgus/kernel_wm8505/blob/wm8505_2.6.29/
 *         drivers/video/wmt/register/wm8510/wm8510-govrh-reg.h
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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.
 */

#ifndef _WM8505FB_REGS_H
#define _WM8505FB_REGS_H

/*
 * Color space select register, default value 0x1c
 *   BIT0 GOVRH_DVO_YUV2RGB_ENABLE
 *   BIT1 GOVRH_VGA_YUV2RGB_ENABLE
 *   BIT2 GOVRH_RGB_MODE
 *   BIT3 GOVRH_DAC_CLKINV
 *   BIT4 GOVRH_BLANK_ZERO
 */
#define WMT_GOVR_COLORSPACE	0x1e4
/*
 * Another colorspace select register, default value 1
 *   BIT0 GOVRH_DVO_RGB
 *   BIT1 GOVRH_DVO_YUV422
 */
#define WMT_GOVR_COLORSPACE1	 0x30

#define WMT_GOVR_CONTRAST	0x1b8
#define WMT_GOVR_BRGHTNESS	0x1bc /* incompatible with RGB? */

/* Framubeffer address */
#define WMT_GOVR_FBADDR		 0x90
#define WMT_GOVR_FBADDR1	 0x94 /* UV offset in YUV mode */

/* Offset of visible window */
#define WMT_GOVR_XPAN		 0xa4
#define WMT_GOVR_YPAN		 0xa0

#define WMT_GOVR_XRES		 0x98
#define WMT_GOVR_XRES_VIRTUAL	 0x9c

#define WMT_GOVR_MIF_ENABLE	 0x80
#define WMT_GOVR_FHI		 0xa8
#define WMT_GOVR_REG_UPDATE	 0xe4

/*
 *   BIT0 GOVRH_DVO_OUTWIDTH
 *   BIT1 GOVRH_DVO_SYNC_POLAR
 *   BIT2 GOVRH_DVO_ENABLE
 */
#define WMT_GOVR_DVO_SET	0x148

/* Timing generator? */
#define WMT_GOVR_TG		0x100

/* Timings */
#define WMT_GOVR_TIMING_H_ALL	0x108
#define WMT_GOVR_TIMING_V_ALL	0x10c
#define WMT_GOVR_TIMING_V_START	0x110
#define WMT_GOVR_TIMING_V_END	0x114
#define WMT_GOVR_TIMING_H_START	0x118
#define WMT_GOVR_TIMING_H_END	0x11c
#define WMT_GOVR_TIMING_V_SYNC	0x128
#define WMT_GOVR_TIMING_H_SYNC	0x12c

#endif /* _WM8505FB_REGS_H */
idden' name='id' value='966d2b04e070bc040319aaebfec09e0144dc3341'/><select name='qt'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=966d2b04e070bc040319aaebfec09e0144dc3341'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?id=966d2b04e070bc040319aaebfec09e0144dc3341'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/dsa?id=966d2b04e070bc040319aaebfec09e0144dc3341'>dsa</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/dsa?id=966d2b04e070bc040319aaebfec09e0144dc3341'>966d2b04e070bc040319aaebfec09e0144dc3341</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/dsa?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/dsa?id=966d2b04e070bc040319aaebfec09e0144dc3341'>net/dsa</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/dsa?id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>1b1bc42c1692e9b62756323c675a44cb1a1f9dbd</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/dsa?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/dsa')</div><table summary='diffstat' class='diffstat'>