/*
 *  net/9p/util.c
 *
 *  This file contains some helper functions
 *
 *  Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
 *
 *  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.
 *
 *  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:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/parser.h>
#include <linux/idr.h>
#include <linux/slab.h>
#include <net/9p/9p.h>

/**
 * struct p9_idpool - per-connection accounting for tag idpool
 * @lock: protects the pool
 * @pool: idr to allocate tag id from
 *
 */

struct p9_idpool {
	spinlock_t lock;
	struct idr pool;
};

/**
 * p9_idpool_create - create a new per-connection id pool
 *
 */

struct p9_idpool *p9_idpool_create(void)
{
	struct p9_idpool *p;

	p = kmalloc(sizeof(struct p9_idpool), GFP_KERNEL);
	if (!p)
		return ERR_PTR(-ENOMEM);

	spin_lock_init(&p->lock);
	idr_init(&p->pool);

	return p;
}
EXPORT_SYMBOL(p9_idpool_create);

/**
 * p9_idpool_destroy - create a new per-connection id pool
 * @p: idpool to destroy
 */

void p9_idpool_destroy(struct p9_idpool *p)
{
	idr_destroy(&p->pool);
	kfree(p);
}
EXPORT_SYMBOL(p9_idpool_destroy);

/**
 * p9_idpool_get - allocate numeric id from pool
 * @p: pool to allocate from
 *
 * Bugs: This seems to be an awful generic function, should it be in idr.c with
 *            the lock included in struct idr?
 */

int p9_idpool_get(struct p9_idpool *p)
{
	int i;
	unsigned long flags;

	idr_preload(GFP_NOFS);
	spin_lock_irqsave(&p->lock, flags);

	/* no need to store exactly p, we just need something non-null */
	i = idr_alloc(&p->pool, p, 0, 0, GFP_NOWAIT);

	spin_unlock_irqrestore(&p->lock, flags);
	idr_preload_end();
	if (i < 0)
		return -1;

	p9_debug(P9_DEBUG_MUX, " id %d pool %p\n", i, p);
	return i;
}
EXPORT_SYMBOL(p9_idpool_get);

/**
 * p9_idpool_put - release numeric id from pool
 * @id: numeric id which is being released
 * @p: pool to release id into
 *
 * Bugs: This seems to be an awful generic function, should it be in idr.c with
 *            the lock included in struct idr?
 */

void p9_idpool_put(int id, struct p9_idpool *p)
{
	unsigned long flags;

	p9_debug(P9_DEBUG_MUX, " id %d pool %p\n", id, p);

	spin_lock_irqsave(&p->lock, flags);
	idr_remove(&p->pool, id);
	spin_unlock_irqrestore(&p->lock, flags);
}
EXPORT_SYMBOL(p9_idpool_put);

/**
 * p9_idpool_check - check if the specified id is available
 * @id: id to check
 * @p: pool to check
 */

int p9_idpool_check(int id, struct p9_idpool *p)
{
	return idr_find(&p->pool, id) != NULL;
}
EXPORT_SYMBOL(p9_idpool_check);

it/log/net/sched/sch_drr.c?h=nds-private-remove&amp;id=d5e582523aead22cd1fd62aee232b6f9e4ce82c1'>sch_drr.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/sched/sch_drr.c?h=nds-private-remove&amp;id=d5e582523aead22cd1fd62aee232b6f9e4ce82c1&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
text' 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>Jurij Smakov &lt;jurij@wooyd.org&gt;</td><td class='right'>2017-01-30 15:41:36 -0600</td></tr>
<tr><th>committer</th><td>Kalle Valo &lt;kvalo@codeaurora.org&gt;</td><td class='right'>2017-01-31 09:05:25 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/caif/cfdbgl.c?h=nds-private-remove&amp;id=52f5631a4c056ad01682393be56d2be237e81610'>52f5631a4c056ad01682393be56d2be237e81610</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/caif/cfdbgl.c?id=52f5631a4c056ad01682393be56d2be237e81610'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=52f5631a4c056ad01682393be56d2be237e81610'>53d1ddd2c1b179c808df10b6ce731ad26aa9f31b</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/caif/cfdbgl.c?h=nds-private-remove&amp;id=52f5631a4c056ad01682393be56d2be237e81610'>net/caif/cfdbgl.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/caif/cfdbgl.c?h=nds-private-remove&amp;id=2b1d530cb3157f828fcaadd259613f59db3c6d1c'>2b1d530cb3157f828fcaadd259613f59db3c6d1c</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/caif/cfdbgl.c?h=nds-private-remove&amp;id=52f5631a4c056ad01682393be56d2be237e81610&amp;id2=2b1d530cb3157f828fcaadd259613f59db3c6d1c'>diff</a>)</td></tr></table>
<div class='commit-subject'>rtlwifi: rtl8192ce: Fix loading of incorrect firmware</div><div class='commit-msg'>In commit cf4747d7535a ("rtlwifi: Fix regression caused by commit
d86e64768859, an error in the edit results in the wrong firmware
being loaded for some models of the RTL8188/8192CE. In this condition,
the connection suffered from high ping latency, slow transfer rates,
 and required higher signal strengths to work at all

See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=853073,
https://bugzilla.opensuse.org/show_bug.cgi?id=1017471, and
https://github.com/lwfinger/rtlwifi_new/issues/203 for descriptions
of the problems. This patch fixes all of those problems.

Fixes: cf4747d7535a ("rtlwifi: Fix regression caused by commit d86e64768859")
Signed-off-by: Jurij Smakov &lt;jurij@wooyd.org&gt;
Signed-off-by: Larry Finger &lt;Larry.Finger@lwfinger.net&gt;
Cc: Stable &lt;stable@vger.kernel.org&gt; # 4.9+
Signed-off-by: Kalle Valo &lt;kvalo@codeaurora.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=52f5631a4c056ad01682393be56d2be237e81610'>Diffstat</a> (limited to 'net/caif/cfdbgl.c')</div><table summary='diffstat' class='diffstat'>