Commit 1f5bd384 authored Dec 07, 2009 by Peter Oberparleiter Committed by Martin Schwidefsky Dec 07, 2009

[S390] cio: ensure proper locking during device recognition



Device recognition needs to be started with the ccw device lock
held to prevent race conditions between I/O starting and interrupt
reception.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

parent 7c4d964f

drivers/s390/cio/device.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -488,7 +488,9 @@ static int online_store_recog_and_online(struct ccw_device *cdev)
		{
		/* Do device recognition, if needed. */
		if (cdev->private->state == DEV_STATE_BOXED) {
		spin_lock_irq(cdev->ccwlock);
		ccw_device_recognition(cdev);
		spin_unlock_irq(cdev->ccwlock);
		wait_event(cdev->private->wait_q,
		cdev->private->flags.recog_done);
		if (cdev->private->state != DEV_STATE_OFFLINE)