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s390/cio: fix unlocked access of online member 

Make sure that access to the online member of a ccw device is
guarded by the ccwlock.

Reported-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2013-12-16 10:51:54 +01:00 committed by Martin Schwidefsky
parent d7528862cf
commit 74bd0d859d
1 changed files with 9 additions and 4 deletions
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13
drivers/s390/cio/device.c
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@ -333,9 +333,9 @@ int ccw_device_set_offline(struct ccw_device *cdev)
if (ret != 0)
return ret;
}
cdev->online = 0;
spin_lock_irq(cdev->ccwlock);
sch = to_subchannel(cdev->dev.parent);
cdev->online = 0;
/* Wait until a final state or DISCONNECTED is reached */
while (!dev_fsm_final_state(cdev) &&
cdev->private->state != DEV_STATE_DISCONNECTED) {
@ -446,7 +446,10 @@ int ccw_device_set_online(struct ccw_device *cdev)
ret = cdev->drv->set_online(cdev);
if (ret)
goto rollback;
spin_lock_irq(cdev->ccwlock);
cdev->online = 1;
spin_unlock_irq(cdev->ccwlock);
return 0;
rollback:
@ -1745,8 +1748,7 @@ ccw_device_probe (struct device *dev)
return 0;
}
static int
ccw_device_remove (struct device *dev)
static int ccw_device_remove(struct device *dev)
{
struct ccw_device *cdev = to_ccwdev(dev);
struct ccw_driver *cdrv = cdev->drv;
@ -1754,9 +1756,10 @@ ccw_device_remove (struct device *dev)
if (cdrv->remove)
cdrv->remove(cdev);
spin_lock_irq(cdev->ccwlock);
if (cdev->online) {
cdev->online = 0;
spin_lock_irq(cdev->ccwlock);
ret = ccw_device_offline(cdev);
spin_unlock_irq(cdev->ccwlock);
if (ret == 0)
@ -1769,10 +1772,12 @@ ccw_device_remove (struct device *dev)
cdev->private->dev_id.devno);
/* Give up reference obtained in ccw_device_set_online(). */
put_device(&cdev->dev);
spin_lock_irq(cdev->ccwlock);
}
ccw_device_set_timeout(cdev, 0);
cdev->drv = NULL;
cdev->private->int_class = IRQIO_CIO;
spin_unlock_irq(cdev->ccwlock);
return 0;
}