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[S390] cio: ensure proper locking during device recognition

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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>
This commit is contained in:
Peter Oberparleiter 2009-12-07 12:51:23 +01:00 committed by Martin Schwidefsky
parent 7c4d964fa4
commit 1f5bd3848b
1 changed files with 2 additions and 0 deletions
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2
drivers/s390/cio/device.c
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@ -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)