/*
 *	NET3:	802.3 data link hooks used for IPX 802.3
 *
 *	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; either version
 *	2 of the License, or (at your option) any later version.
 *
 *	802.3 isn't really a protocol data link layer. Some old IPX stuff
 *	uses it however. Note that there is only one 802.3 protocol layer
 *	in the system. We don't currently support different protocols
 *	running raw 802.3 on different devices. Thankfully nobody else
 *	has done anything like the old IPX.
 */

#include <linux/in.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/slab.h>

#include <net/datalink.h>
#include <net/p8022.h>

/*
 *	Place an 802.3 header on a packet. The driver will do the mac
 *	addresses, we just need to give it the buffer length.
 */
static int p8023_request(struct datalink_proto *dl,
			 struct sk_buff *skb, unsigned char *dest_node)
{
	struct net_device *dev = skb->dev;

	dev_hard_header(skb, dev, ETH_P_802_3, dest_node, NULL, skb->len);
	return dev_queue_xmit(skb);
}

/*
 *	Create an 802.3 client. Note there can be only one 802.3 client
 */
struct datalink_proto *make_8023_client(void)
{
	struct datalink_proto *proto = kmalloc(sizeof(*proto), GFP_ATOMIC);

	if (proto) {
		proto->header_length = 0;
		proto->request	     = p8023_request;
	}
	return proto;
}

/*
 *	Destroy the 802.3 client.
 */
void destroy_8023_client(struct datalink_proto *dl)
{
	kfree(dl);
}

EXPORT_SYMBOL(destroy_8023_client);
EXPORT_SYMBOL(make_8023_client);

MODULE_LICENSE("GPL");
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=0933840acf7b65d6d30a5b6089d882afea57aca3'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/Documentation?id=0933840acf7b65d6d30a5b6089d882afea57aca3'>Documentation</a>/<a href='/cgit.cgi/linux/net-next.git/commit/Documentation/sysrq.txt?id=0933840acf7b65d6d30a5b6089d882afea57aca3'>sysrq.txt</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='0933840acf7b65d6d30a5b6089d882afea57aca3'/><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>Jiri Olsa &lt;jolsa@redhat.com&gt;</td><td class='right'>2016-10-20 13:10:11 +0200</td></tr>
<tr><th>committer</th><td>Ingo Molnar &lt;mingo@kernel.org&gt;</td><td class='right'>2016-10-28 11:06:25 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation/sysrq.txt?id=0933840acf7b65d6d30a5b6089d882afea57aca3'>0933840acf7b65d6d30a5b6089d882afea57aca3</a> (<a href='/cgit.cgi/linux/net-next.git/patch/Documentation/sysrq.txt?id=0933840acf7b65d6d30a5b6089d882afea57aca3'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=0933840acf7b65d6d30a5b6089d882afea57aca3'>d70660c9cc59695decc9860a0446d4dd476feeac</a> /<a href='/cgit.cgi/linux/net-next.git/tree/Documentation/sysrq.txt?id=0933840acf7b65d6d30a5b6089d882afea57aca3'>Documentation/sysrq.txt</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation/sysrq.txt?id=889882bce2a5f69242c1f3acd840983f467499b9'>889882bce2a5f69242c1f3acd840983f467499b9</a> (<a href='/cgit.cgi/linux/net-next.git/diff/Documentation/sysrq.txt?id=0933840acf7b65d6d30a5b6089d882afea57aca3&amp;id2=889882bce2a5f69242c1f3acd840983f467499b9'>diff</a>)</td></tr></table>
<div class='commit-subject'>perf/core: Protect PMU device removal with a 'pmu_bus_running' check, to fix CONFIG_DEBUG_TEST_DRIVER_REMOVE=y kernel panic</div><div class='commit-msg'>CAI Qian reported a crash in the PMU uncore device removal code,
enabled by the CONFIG_DEBUG_TEST_DRIVER_REMOVE=y option:

  https://marc.info/?l=linux-kernel&amp;m=147688837328451

The reason for the crash is that perf_pmu_unregister() tries to remove
a PMU device which is not added at this point. We add PMU devices
only after pmu_bus is registered, which happens in the
perf_event_sysfs_init() call and sets the 'pmu_bus_running' flag.

The fix is to get the 'pmu_bus_running' flag state at the point
the PMU is taken out of the PMU list and remove the device
later only if it's set.

Reported-by: CAI Qian &lt;caiqian@redhat.com&gt;
Tested-by: CAI Qian &lt;caiqian@redhat.com&gt;
Signed-off-by: Jiri Olsa &lt;jolsa@kernel.org&gt;
Signed-off-by: Peter Zijlstra (Intel) &lt;peterz@infradead.org&gt;
Cc: Alexander Shishkin &lt;alexander.shishkin@linux.intel.com&gt;
Cc: Arnaldo Carvalho de Melo &lt;acme@redhat.com&gt;
Cc: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;
Cc: Jiri Olsa &lt;jolsa@redhat.com&gt;
Cc: Kan Liang &lt;kan.liang@intel.com&gt;
Cc: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
Cc: Peter Zijlstra &lt;peterz@infradead.org&gt;
Cc: Rob Herring &lt;robh@kernel.org&gt;
Cc: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Link: http://lkml.kernel.org/r/20161020111011.GA13361@krava
Signed-off-by: Ingo Molnar &lt;mingo@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=0933840acf7b65d6d30a5b6089d882afea57aca3'>Diffstat</a> (limited to 'Documentation/sysrq.txt')</div><table summary='diffstat' class='diffstat'>