[S390] dasd: fix refcounting in dasd_change_state

To set a dasd online dasd_change_state is called twice. The first
cycle will schedule initial analysis of the device, set the rc to
-EAGAIN and will not touch the device state any more.
The initial analysis will in turn call dasd_change_state to increase
the state to the final DASD_STATE_ONLINE.

If the dasd_change_state on the second thread outruns the other one
both finish with the state set to DASD_STATE_ONLINE and the device
refcount will be decreased by 2.

Fix this by leaving dasd_change_state on rc == -EAGAIN so that the
refcount will always be decreased by 1.

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

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 99e71536213a..749836668655 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -470,7 +470,7 @@ static int dasd_decrease_state(struct dasd_device *device)
  */
 static void dasd_change_state(struct dasd_device *device)
 {
-        int rc;
+        int rc;
 
         if (device->state == device->target)
                 /* Already where we want to go today... */
@@ -479,8 +479,10 @@ static void dasd_change_state(struct dasd_device *device)
                 rc = dasd_increase_state(device);
         else
                 rc = dasd_decrease_state(device);
-        if (rc && rc != -EAGAIN)
-                device->target = device->state;
+        if (rc == -EAGAIN)
+                return;
+        if (rc)
+                device->target = device->state;
 
         if (device->state == device->target) {
                 wake_up(&dasd_init_waitq);