/*
 * RT-Mutexes: blocking mutual exclusion locks with PI support
 *
 * started by Ingo Molnar and Thomas Gleixner:
 *
 *  Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
 *  Copyright (C) 2006 Timesys Corp., Thomas Gleixner <tglx@timesys.com>
 *
 * This code is based on the rt.c implementation in the preempt-rt tree.
 * Portions of said code are
 *
 *  Copyright (C) 2004  LynuxWorks, Inc., Igor Manyilov, Bill Huey
 *  Copyright (C) 2006  Esben Nielsen
 *  Copyright (C) 2006  Kihon Technologies Inc.,
 *			Steven Rostedt <rostedt@goodmis.org>
 *
 * See rt.c in preempt-rt for proper credits and further information
 */
#include <linux/sched.h>
#include <linux/sched/rt.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/spinlock.h>
#include <linux/kallsyms.h>
#include <linux/syscalls.h>
#include <linux/interrupt.h>
#include <linux/rbtree.h>
#include <linux/fs.h>
#include <linux/debug_locks.h>

#include "rtmutex_common.h"

static void printk_task(struct task_struct *p)
{
	if (p)
		printk("%16s:%5d [%p, %3d]", p->comm, task_pid_nr(p), p, p->prio);
	else
		printk("<none>");
}

static void printk_lock(struct rt_mutex *lock, int print_owner)
{
	if (lock->name)
		printk(" [%p] {%s}\n",
			lock, lock->name);
	else
		printk(" [%p] {%s:%d}\n",
			lock, lock->file, lock->line);

	if (print_owner && rt_mutex_owner(lock)) {
		printk(".. ->owner: %p\n", lock->owner);
		printk(".. held by:  ");
		printk_task(rt_mutex_owner(lock));
		printk("\n");
	}
}

void rt_mutex_debug_task_free(struct task_struct *task)
{
	DEBUG_LOCKS_WARN_ON(!RB_EMPTY_ROOT(&task->pi_waiters));
	DEBUG_LOCKS_WARN_ON(task->pi_blocked_on);
}

/*
 * We fill out the fields in the waiter to store the information about
 * the deadlock. We print when we return. act_waiter can be NULL in
 * case of a remove waiter operation.
 */
void debug_rt_mutex_deadlock(enum rtmutex_chainwalk chwalk,
			     struct rt_mutex_waiter *act_waiter,
			     struct rt_mutex *lock)
{
	struct task_struct *task;

	if (!debug_locks || chwalk == RT_MUTEX_FULL_CHAINWALK || !act_waiter)
		return;

	task = rt_mutex_owner(act_waiter->lock);
	if (task && task != current) {
		act_waiter->deadlock_task_pid = get_pid(task_pid(task));
		act_waiter->deadlock_lock = lock;
	}
}

void debug_rt_mutex_print_deadlock(struct rt_mutex_waiter *waiter)
{
	struct task_struct *task;

	if (!waiter->deadlock_lock || !debug_locks)
		return;

	rcu_read_lock();
	task = pid_task(waiter->deadlock_task_pid, PIDTYPE_PID);
	if (!task) {
		rcu_read_unlock();
		return;
	}

	if (!debug_locks_off()) {
		rcu_read_unlock();
		return;
	}

	printk("\n============================================\n");
	printk(  "[ BUG: circular locking deadlock detected! ]\n");
	printk("%s\n", print_tainted());
	printk(  "--------------------------------------------\n");
	printk("%s/%d is deadlocking current task %s/%d\n\n",
	       task->comm, task_pid_nr(task),
	       current->comm, task_pid_nr(current));

	printk("\n1) %s/%d is trying to acquire this lock:\n",
	       current->comm, task_pid_nr(current));
	printk_lock(waiter->lock, 1);

	printk("\n2) %s/%d is blocked on this lock:\n",
		task->comm, task_pid_nr(task));
	printk_lock(waiter->deadlock_lock, 1);

	debug_show_held_locks(current);
	debug_show_held_locks(task);

	printk("\n%s/%d's [blocked] stackdump:\n\n",
		task->comm, task_pid_nr(task));
	show_stack(task, NULL);
	printk("\n%s/%d's [current] stackdump:\n\n",
		current->comm, task_pid_nr(current));
	dump_stack();
	debug_show_all_locks();
	rcu_read_unlock();

	printk("[ turning off deadlock detection."
	       "Please report this trace. ]\n\n");
}

void debug_rt_mutex_lock(struct rt_mutex *lock)
{
}

void debug_rt_mutex_unlock(struct rt_mutex *lock)
{
	DEBUG_LOCKS_WARN_ON(rt_mutex_owner(lock) != current);
}

void
debug_rt_mutex_proxy_lock(struct rt_mutex *lock, struct task_struct *powner)
{
}

void debug_rt_mutex_proxy_unlock(struct rt_mutex *lock)
{
	DEBUG_LOCKS_WARN_ON(!rt_mutex_owner(lock));
}

void debug_rt_mutex_init_waiter(struct rt_mutex_waiter *waiter)
{
	memset(waiter, 0x11, sizeof(*waiter));
	waiter->deadlock_task_pid = NULL;
}

void debug_rt_mutex_free_waiter(struct rt_mutex_waiter *waiter)
{
	put_pid(waiter->deadlock_task_pid);
	memset(waiter, 0x22, sizeof(*waiter));
}

void debug_rt_mutex_init(struct rt_mutex *lock, const char *name)
{
	/*
	 * Make sure we are not reinitializing a held lock:
	 */
	debug_check_no_locks_freed((void *)lock, sizeof(*lock));
	lock->name = name;
}

void
rt_mutex_deadlock_account_lock(struct rt_mutex *lock, struct task_struct *task)
{
}

void rt_mutex_deadlock_account_unlock(struct task_struct *task)
{
}

17:17 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings?id=4e5b54f127426c82dc2816340c26d951a5bb3429'>4e5b54f127426c82dc2816340c26d951a5bb3429</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/dt-bindings?id=4e5b54f127426c82dc2816340c26d951a5bb3429'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=4e5b54f127426c82dc2816340c26d951a5bb3429'>cc3a8f7e335cf12880bc8d1a1e2066f6cfe0a68e</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/dt-bindings?id=4e5b54f127426c82dc2816340c26d951a5bb3429'>include/dt-bindings</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings?id=566cf877a1fcb6d6dc0126b076aad062054c2637'>566cf877a1fcb6d6dc0126b076aad062054c2637</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/dt-bindings?id=4e5b54f127426c82dc2816340c26d951a5bb3429&amp;id2=566cf877a1fcb6d6dc0126b076aad062054c2637'>diff</a>)</td></tr></table>
<div class='commit-subject'>drm: prevent double-(un)registration for connectors</div><div class='commit-msg'>If we're unlucky then the registration from a hotplugged connector
might race with the final registration step on driver load. And since
MST topology discover is asynchronous that's even somewhat likely.

v2: Also update the kerneldoc for @registered!

v3: Review from Chris:
- Improve kerneldoc for late_register/early_unregister callbacks.
- Use mutex_destroy.

Reviewed-by: Chris Wilson &lt;chris@chris-wilson.co.uk&gt;
Cc: Chris Wilson &lt;chris@chris-wilson.co.uk&gt;
Reviewed-by: Sean Paul &lt;seanpaul@chromium.org&gt;
Reported-by: Chris Wilson &lt;chris@chris-wilson.co.uk&gt;
Signed-off-by: Daniel Vetter &lt;daniel.vetter@intel.com&gt;
Link: http://patchwork.freedesktop.org/patch/msgid/20161218133545.2106-1-daniel.vetter@ffwll.ch
(cherry picked from commit e73ab00e9a0f1731f34d0620a9c55f5c30c4ad4e)
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=4e5b54f127426c82dc2816340c26d951a5bb3429'>Diffstat</a> (limited to 'include/dt-bindings')</div><table summary='diffstat' class='diffstat'>