genirq: Clear action->thread_mask if IRQ_ONESHOT is not set

		/* add new interrupt at end of irq queue */

		do {

			/*

			 * Or all existing action->thread_mask bits,

			 * so we can find the next zero bit for this

			 * new action.

			 */

			thread_mask |= old->thread_mask;

			old_ptr = &old->next;

			old = *old_ptr;

	}

	/*

	 * Setup the thread mask for this irqaction. Unlikely to have

	 * 32 resp 64 irqs sharing one line, but who knows.

	 * Setup the thread mask for this irqaction for ONESHOT. For

	 * !ONESHOT irqs the thread mask is 0 so we can avoid a

	 * conditional in irq_wake_thread().

	 */

	if (new->flags & IRQF_ONESHOT && thread_mask == ~0UL) {

	if (new->flags & IRQF_ONESHOT) {

		/*

		 * Unlikely to have 32 resp 64 irqs sharing one line,

		 * but who knows.

		 */

		if (thread_mask == ~0UL) {

			ret = -EBUSY;

			goto out_mask;

		}

		/*

		 * The thread_mask for the action is or'ed to

		 * desc->thread_active to indicate that the

		 * IRQF_ONESHOT thread handler has been woken, but not

		 * yet finished. The bit is cleared when a thread

		 * completes. When all threads of a shared interrupt

		 * line have completed desc->threads_active becomes

		 * zero and the interrupt line is unmasked. See

		 * handle.c:irq_wake_thread() for further information.

		 *

		 * If no thread is woken by primary (hard irq context)

		 * interrupt handlers, then desc->threads_active is

		 * also checked for zero to unmask the irq line in the

		 * affected hard irq flow handlers

		 * (handle_[fasteoi|level]_irq).

		 *

		 * The new action gets the first zero bit of

		 * thread_mask assigned. See the loop above which or's

		 * all existing action->thread_mask bits.

		 */

		new->thread_mask = 1 << ffz(thread_mask);

	}

	if (!shared) {

		init_waitqueue_head(&desc->wait_for_threads);