Merge "workqueue: fix possible livelock with concurrent mod_delayed_work()"

#include <linux/uaccess.h>

#include <linux/sched/isolation.h>

#include <linux/nmi.h>

#include <linux/bug.h>

#include <linux/delay.h>

#include "workqueue_internal.h"

	if (work_is_canceling(work))

		return -ENOENT;

	cpu_relax();

	/*

	 * The queueing is in progress in another context. If we keep

	 * taking the pool->lock in a busy loop, the other context may

	 * never get the lock. Give 1 usec delay to avoid this contention.

	 */

	udelay(1);

	return -EAGAIN;

}