#undef TRACE_SYSTEM
#define TRACE_SYSTEM asoc

#if !defined(_TRACE_ASOC_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_ASOC_H

#include <linux/ktime.h>
#include <linux/tracepoint.h>

#define DAPM_DIRECT "(direct)"
#define DAPM_ARROW(dir) (((dir) == SND_SOC_DAPM_DIR_OUT) ? "->" : "<-")

struct snd_soc_jack;
struct snd_soc_codec;
struct snd_soc_card;
struct snd_soc_dapm_widget;
struct snd_soc_dapm_path;

DECLARE_EVENT_CLASS(snd_soc_card,

	TP_PROTO(struct snd_soc_card *card, int val),

	TP_ARGS(card, val),

	TP_STRUCT__entry(
		__string(	name,		card->name	)
		__field(	int,		val		)
	),

	TP_fast_assign(
		__assign_str(name, card->name);
		__entry->val = val;
	),

	TP_printk("card=%s val=%d", __get_str(name), (int)__entry->val)
);

DEFINE_EVENT(snd_soc_card, snd_soc_bias_level_start,

	TP_PROTO(struct snd_soc_card *card, int val),

	TP_ARGS(card, val)

);

DEFINE_EVENT(snd_soc_card, snd_soc_bias_level_done,

	TP_PROTO(struct snd_soc_card *card, int val),

	TP_ARGS(card, val)

);

DECLARE_EVENT_CLASS(snd_soc_dapm_basic,

	TP_PROTO(struct snd_soc_card *card),

	TP_ARGS(card),

	TP_STRUCT__entry(
		__string(	name,	card->name	)
	),

	TP_fast_assign(
		__assign_str(name, card->name);
	),

	TP_printk("card=%s", __get_str(name))
);

DEFINE_EVENT(snd_soc_dapm_basic, snd_soc_dapm_start,

	TP_PROTO(struct snd_soc_card *card),

	TP_ARGS(card)

);

DEFINE_EVENT(snd_soc_dapm_basic, snd_soc_dapm_done,

	TP_PROTO(struct snd_soc_card *card),

	TP_ARGS(card)

);

DECLARE_EVENT_CLASS(snd_soc_dapm_widget,

	TP_PROTO(struct snd_soc_dapm_widget *w, int val),

	TP_ARGS(w, val),

	TP_STRUCT__entry(
		__string(	name,	w->name		)
		__field(	int,	val		)
	),

	TP_fast_assign(
		__assign_str(name, w->name);
		__entry->val = val;
	),

	TP_printk("widget=%s val=%d", __get_str(name),
		  (int)__entry->val)
);

DEFINE_EVENT(snd_soc_dapm_widget, snd_soc_dapm_widget_power,

	TP_PROTO(struct snd_soc_dapm_widget *w, int val),

	TP_ARGS(w, val)

);

DEFINE_EVENT(snd_soc_dapm_widget, snd_soc_dapm_widget_event_start,

	TP_PROTO(struct snd_soc_dapm_widget *w, int val),

	TP_ARGS(w, val)

);

DEFINE_EVENT(snd_soc_dapm_widget, snd_soc_dapm_widget_event_done,

	TP_PROTO(struct snd_soc_dapm_widget *w, int val),

	TP_ARGS(w, val)

);

TRACE_EVENT(snd_soc_dapm_walk_done,

	TP_PROTO(struct snd_soc_card *card),

	TP_ARGS(card),

	TP_STRUCT__entry(
		__string(	name,	card->name		)
		__field(	int,	power_checks		)
		__field(	int,	path_checks		)
		__field(	int,	neighbour_checks	)
	),

	TP_fast_assign(
		__assign_str(name, card->name);
		__entry->power_checks = card->dapm_stats.power_checks;
		__entry->path_checks = card->dapm_stats.path_checks;
		__entry->neighbour_checks = card->dapm_stats.neighbour_checks;
	),

	TP_printk("%s: checks %d power, %d path, %d neighbour",
		  __get_str(name), (int)__entry->power_checks,
		  (int)__entry->path_checks, (int)__entry->neighbour_checks)
);

TRACE_EVENT(snd_soc_dapm_path,

	TP_PROTO(struct snd_soc_dapm_widget *widget,
		enum snd_soc_dapm_direction dir,
		struct snd_soc_dapm_path *path),

	TP_ARGS(widget, dir, path),

	TP_STRUCT__entry(
		__string(	wname,	widget->name		)
		__string(	pname,	path->name ? path->name : DAPM_DIRECT)
		__string(	pnname,	path->node[dir]->name	)
		__field(	int,	path_node		)
		__field(	int,	path_connect		)
		__field(	int,	path_dir		)
	),

	TP_fast_assign(
		__assign_str(wname, widget->name);
		__assign_str(pname, path->name ? path->name : DAPM_DIRECT);
		__assign_str(pnname, path->node[dir]->name);
		__entry->path_connect = path->connect;
		__entry->path_node = (long)path->node[dir];
		__entry->path_dir = dir;
	),

	TP_printk("%c%s %s %s %s %s",
		(int) __entry->path_node &&
		(int) __entry->path_connect ? '*' : ' ',
		__get_str(wname), DAPM_ARROW(__entry->path_dir),
		__get_str(pname), DAPM_ARROW(__entry->path_dir),
		__get_str(pnname))
);

TRACE_EVENT(snd_soc_dapm_connected,

	TP_PROTO(int paths, int stream),

	TP_ARGS(paths, stream),

	TP_STRUCT__entry(
		__field(	int,	paths		)
		__field(	int,	stream		)
	),

	TP_fast_assign(
		__entry->paths = paths;
		__entry->stream = stream;
	),

	TP_printk("%s: found %d paths",
		__entry->stream ? "capture" : "playback", __entry->paths)
);

TRACE_EVENT(snd_soc_jack_irq,

	TP_PROTO(const char *name),

	TP_ARGS(name),

	TP_STRUCT__entry(
		__string(	name,	name		)
	),

	TP_fast_assign(
		__assign_str(name, name);
	),

	TP_printk("%s", __get_str(name))
);

TRACE_EVENT(snd_soc_jack_report,

	TP_PROTO(struct snd_soc_jack *jack, int mask, int val),

	TP_ARGS(jack, mask, val),

	TP_STRUCT__entry(
		__string(	name,		jack->jack->id		)
		__field(	int,		mask			)
		__field(	int,		val			)
	),

	TP_fast_assign(
		__assign_str(name, jack->jack->id);
		__entry->mask = mask;
		__entry->val = val;
	),

	TP_printk("jack=%s %x/%x", __get_str(name), (int)__entry->val,
		  (int)__entry->mask)
);

TRACE_EVENT(snd_soc_jack_notify,

	TP_PROTO(struct snd_soc_jack *jack, int val),

	TP_ARGS(jack, val),

	TP_STRUCT__entry(
		__string(	name,		jack->jack->id		)
		__field(	int,		val			)
	),

	TP_fast_assign(
		__assign_str(name, jack->jack->id);
		__entry->val = val;
	),

	TP_printk("jack=%s %x", __get_str(name), (int)__entry->val)
);

#endif /* _TRACE_ASOC_H */

/* This part must be outside protection */
#include <trace/define_trace.h>
56e3d1dd4dfd6039b7c219c9dc4616da52d</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/lapb/lapb_out.c?id=966d2b04e070bc040319aaebfec09e0144dc3341'>net/lapb/lapb_out.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/lapb/lapb_out.c?id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>1b1bc42c1692e9b62756323c675a44cb1a1f9dbd</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/lapb/lapb_out.c?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/lapb/lapb_out.c')</div><table summary='diffstat' class='diffstat'>