/*
 * This file implement the Wireless Extensions proc API.
 *
 * Authors :	Jean Tourrilhes - HPL - <jt@hpl.hp.com>
 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
 *
 * (As all part of the Linux kernel, this file is GPL)
 */

/*
 * The /proc/net/wireless file is a human readable user-space interface
 * exporting various wireless specific statistics from the wireless devices.
 * This is the most popular part of the Wireless Extensions ;-)
 *
 * This interface is a pure clone of /proc/net/dev (in net/core/dev.c).
 * The content of the file is basically the content of "struct iw_statistics".
 */

#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/wireless.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <net/iw_handler.h>
#include <net/wext.h>


static void wireless_seq_printf_stats(struct seq_file *seq,
				      struct net_device *dev)
{
	/* Get stats from the driver */
	struct iw_statistics *stats = get_wireless_stats(dev);
	static struct iw_statistics nullstats = {};

	/* show device if it's wireless regardless of current stats */
	if (!stats) {
#ifdef CONFIG_WIRELESS_EXT
		if (dev->wireless_handlers)
			stats = &nullstats;
#endif
#ifdef CONFIG_CFG80211
		if (dev->ieee80211_ptr)
			stats = &nullstats;
#endif
	}

	if (stats) {
		seq_printf(seq, "%6s: %04x  %3d%c  %3d%c  %3d%c  %6d %6d %6d "
				"%6d %6d   %6d\n",
			   dev->name, stats->status, stats->qual.qual,
			   stats->qual.updated & IW_QUAL_QUAL_UPDATED
			   ? '.' : ' ',
			   ((__s32) stats->qual.level) -
			   ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
			   stats->qual.updated & IW_QUAL_LEVEL_UPDATED
			   ? '.' : ' ',
			   ((__s32) stats->qual.noise) -
			   ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
			   stats->qual.updated & IW_QUAL_NOISE_UPDATED
			   ? '.' : ' ',
			   stats->discard.nwid, stats->discard.code,
			   stats->discard.fragment, stats->discard.retries,
			   stats->discard.misc, stats->miss.beacon);

		if (stats != &nullstats)
			stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
	}
}

/* ---------------------------------------------------------------- */
/*
 * Print info for /proc/net/wireless (print all entries)
 */
static int wireless_dev_seq_show(struct seq_file *seq, void *v)
{
	might_sleep();

	if (v == SEQ_START_TOKEN)
		seq_printf(seq, "Inter-| sta-|   Quality        |   Discarded "
				"packets               | Missed | WE\n"
				" face | tus | link level noise |  nwid  "
				"crypt   frag  retry   misc | beacon | %d\n",
			   WIRELESS_EXT);
	else
		wireless_seq_printf_stats(seq, v);
	return 0;
}

static void *wireless_dev_seq_start(struct seq_file *seq, loff_t *pos)
{
	struct net *net = seq_file_net(seq);
	loff_t off;
	struct net_device *dev;

	rtnl_lock();
	if (!*pos)
		return SEQ_START_TOKEN;

	off = 1;
	for_each_netdev(net, dev)
		if (off++ == *pos)
			return dev;
	return NULL;
}

static void *wireless_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	struct net *net = seq_file_net(seq);

	++*pos;

	return v == SEQ_START_TOKEN ?
		first_net_device(net) : next_net_device(v);
}

static void wireless_dev_seq_stop(struct seq_file *seq, void *v)
{
	rtnl_unlock();
}

static const struct seq_operations wireless_seq_ops = {
	.start = wireless_dev_seq_start,
	.next  = wireless_dev_seq_next,
	.stop  = wireless_dev_seq_stop,
	.show  = wireless_dev_seq_show,
};

static int seq_open_wireless(struct inode *inode, struct file *file)
{
	return seq_open_net(inode, file, &wireless_seq_ops,
			    sizeof(struct seq_net_private));
}

static const struct file_operations wireless_seq_fops = {
	.owner	 = THIS_MODULE,
	.open    = seq_open_wireless,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release_net,
};

int __net_init wext_proc_init(struct net *net)
{
	/* Create /proc/net/wireless entry */
	if (!proc_create("wireless", S_IRUGO, net->proc_net,
			 &wireless_seq_fops))
		return -ENOMEM;

	return 0;
}

void __net_exit wext_proc_exit(struct net *net)
{
	remove_proc_entry("wireless", net->proc_net);
}
e='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>Marc Zyngier &lt;marc.zyngier@arm.com&gt;</td><td class='right'>2017-01-17 16:00:48 +0000</td></tr>
<tr><th>committer</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2017-01-30 15:18:56 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/mac80211/ibss.c?h=nds-private-remove&amp;id=08d85f3ea99f1eeafc4e8507936190e86a16ee8c'>08d85f3ea99f1eeafc4e8507936190e86a16ee8c</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/mac80211/ibss.c?id=08d85f3ea99f1eeafc4e8507936190e86a16ee8c'>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=08d85f3ea99f1eeafc4e8507936190e86a16ee8c'>410bb1acd0cd7dcfaad37ae7b63ff243b7fa4bee</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/mac80211/ibss.c?h=nds-private-remove&amp;id=08d85f3ea99f1eeafc4e8507936190e86a16ee8c'>net/mac80211/ibss.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/mac80211/ibss.c?h=nds-private-remove&amp;id=566cf877a1fcb6d6dc0126b076aad062054c2637'>566cf877a1fcb6d6dc0126b076aad062054c2637</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/mac80211/ibss.c?h=nds-private-remove&amp;id=08d85f3ea99f1eeafc4e8507936190e86a16ee8c&amp;id2=566cf877a1fcb6d6dc0126b076aad062054c2637'>diff</a>)</td></tr></table>
<div class='commit-subject'>irqdomain: Avoid activating interrupts more than once</div><div class='commit-msg'>Since commit f3b0946d629c ("genirq/msi: Make sure PCI MSIs are
activated early"), we can end-up activating a PCI/MSI twice (once
at allocation time, and once at startup time).

This is normally of no consequences, except that there is some
HW out there that may misbehave if activate is used more than once
(the GICv3 ITS, for example, uses the activate callback
to issue the MAPVI command, and the architecture spec says that
"If there is an existing mapping for the EventID-DeviceID
combination, behavior is UNPREDICTABLE").

While this could be worked around in each individual driver, it may
make more sense to tackle the issue at the core level. In order to
avoid getting in that situation, let's have a per-interrupt flag
to remember if we have already activated that interrupt or not.

Fixes: f3b0946d629c ("genirq/msi: Make sure PCI MSIs are activated early")
Reported-and-tested-by: Andre Przywara &lt;andre.przywara@arm.com&gt;
Signed-off-by: Marc Zyngier &lt;marc.zyngier@arm.com&gt;
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1484668848-24361-1-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;

</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=08d85f3ea99f1eeafc4e8507936190e86a16ee8c'>Diffstat</a> (limited to 'net/mac80211/ibss.c')</div><table summary='diffstat' class='diffstat'>