[S390] cio: disallow online setting of device in transient state

Return -EAGAIN on writes to sysfs online attribute if the corresponding
ccw device is in transient state.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 868f8c6b053a..e47aa3f04769 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -515,7 +515,11 @@ static ssize_t online_store (struct device *dev, struct device_attribute *attr,
         int force, ret;
         unsigned long i;
 
-        if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
+        if ((cdev->private->state != DEV_STATE_OFFLINE &&
+             cdev->private->state != DEV_STATE_ONLINE &&
+             cdev->private->state != DEV_STATE_BOXED &&
+             cdev->private->state != DEV_STATE_DISCONNECTED) ||
+            atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
                 return -EAGAIN;
 
         if (cdev->drv && !try_module_get(cdev->drv->owner)) {