/*
 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * 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.
 *
 * This program is distributed in the hope that it would 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 the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_SUPPORT_MRLOCK_H__
#define __XFS_SUPPORT_MRLOCK_H__

#include <linux/rwsem.h>

typedef struct {
	struct rw_semaphore	mr_lock;
#if defined(DEBUG) || defined(XFS_WARN)
	int			mr_writer;
#endif
} mrlock_t;

#if defined(DEBUG) || defined(XFS_WARN)
#define mrinit(mrp, name)	\
	do { (mrp)->mr_writer = 0; init_rwsem(&(mrp)->mr_lock); } while (0)
#else
#define mrinit(mrp, name)	\
	do { init_rwsem(&(mrp)->mr_lock); } while (0)
#endif

#define mrlock_init(mrp, t,n,s)	mrinit(mrp, n)
#define mrfree(mrp)		do { } while (0)

static inline void mraccess_nested(mrlock_t *mrp, int subclass)
{
	down_read_nested(&mrp->mr_lock, subclass);
}

static inline void mrupdate_nested(mrlock_t *mrp, int subclass)
{
	down_write_nested(&mrp->mr_lock, subclass);
#if defined(DEBUG) || defined(XFS_WARN)
	mrp->mr_writer = 1;
#endif
}

static inline int mrtryaccess(mrlock_t *mrp)
{
	return down_read_trylock(&mrp->mr_lock);
}

static inline int mrtryupdate(mrlock_t *mrp)
{
	if (!down_write_trylock(&mrp->mr_lock))
		return 0;
#if defined(DEBUG) || defined(XFS_WARN)
	mrp->mr_writer = 1;
#endif
	return 1;
}

static inline void mrunlock_excl(mrlock_t *mrp)
{
#if defined(DEBUG) || defined(XFS_WARN)
	mrp->mr_writer = 0;
#endif
	up_write(&mrp->mr_lock);
}

static inline void mrunlock_shared(mrlock_t *mrp)
{
	up_read(&mrp->mr_lock);
}

static inline void mrdemote(mrlock_t *mrp)
{
#if defined(DEBUG) || defined(XFS_WARN)
	mrp->mr_writer = 0;
#endif
	downgrade_write(&mrp->mr_lock);
}

#endif /* __XFS_SUPPORT_MRLOCK_H__ */
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=35609502ac5dea2b149ec0368791d9c0e246bd65'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers?id=35609502ac5dea2b149ec0368791d9c0e246bd65'>drivers</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?id=35609502ac5dea2b149ec0368791d9c0e246bd65'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/dwc3?id=35609502ac5dea2b149ec0368791d9c0e246bd65'>dwc3</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/dwc3/gadget.c?id=35609502ac5dea2b149ec0368791d9c0e246bd65'>gadget.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='35609502ac5dea2b149ec0368791d9c0e246bd65'/><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>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-02-01 09:22:08 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-02-01 09:22:08 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/dwc3/gadget.c?id=35609502ac5dea2b149ec0368791d9c0e246bd65'>35609502ac5dea2b149ec0368791d9c0e246bd65</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/dwc3/gadget.c?id=35609502ac5dea2b149ec0368791d9c0e246bd65'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=35609502ac5dea2b149ec0368791d9c0e246bd65'>6819f6bc5b8c3585b7a19cc0d8d25d703a1bc57c</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/dwc3/gadget.c?id=35609502ac5dea2b149ec0368791d9c0e246bd65'>drivers/usb/dwc3/gadget.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/dwc3/gadget.c?id=c325b3533730016ca5cdaf902d62550b4243fe43'>c325b3533730016ca5cdaf902d62550b4243fe43</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/dwc3/gadget.c?id=35609502ac5dea2b149ec0368791d9c0e246bd65&amp;id2=c325b3533730016ca5cdaf902d62550b4243fe43'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/dwc3/gadget.c?id=91539eb1fda2d530d3b268eef542c5414e54bf1a'>91539eb1fda2d530d3b268eef542c5414e54bf1a</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/dwc3/gadget.c?id=35609502ac5dea2b149ec0368791d9c0e246bd65&amp;id2=91539eb1fda2d530d3b268eef542c5414e54bf1a'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'dmaengine-fix-4.10-rc7' of git://git.infradead.org/users/vkoul/slave-dma</div><div class='commit-msg'>Pull dmaengine fixes from Vinod Koul:
 "A couple of fixes showed up late in the cycle so sending them up and
  sending early in the week and not on Friday :).

  They fix a double lock in pl330 driver and runtime pm fixes for cppi
  driver"

* tag 'dmaengine-fix-4.10-rc7' of git://git.infradead.org/users/vkoul/slave-dma:
  dmaengine: pl330: fix double lock
  dmaengine: cppi41: Clean up pointless warnings
  dmaengine: cppi41: Fix oops in cppi41_runtime_resume
  dmaengine: cppi41: Fix runtime PM timeouts with USB mass storage
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=35609502ac5dea2b149ec0368791d9c0e246bd65'>Diffstat</a> (limited to 'drivers/usb/dwc3/gadget.c')</div><table summary='diffstat' class='diffstat'>