[S390] cio: fix repeat setting of cdev parent association

sch_create_and_recog_new_device() associates a parent subchannel
with its ccw device child even though this is already done by
the subsequently called io_subchannel_recog(). Also make sure
io_subchannel_recog() sets the association under lock.

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

1 files changed, 1 insertions, 4 deletions

diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 55f997308e42..0efecefdb83a 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -888,9 +888,6 @@ static void sch_create_and_recog_new_device(struct subchannel *sch)
                 css_sch_device_unregister(sch);
                 return;
         }
-        spin_lock_irq(sch->lock);
-        sch_set_cdev(sch, cdev);
-        spin_unlock_irq(sch->lock);
         /* Start recognition for the new ccw device. */
         if (io_subchannel_recog(cdev, sch)) {
                 spin_lock_irq(sch->lock);
@@ -1107,7 +1104,6 @@ io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
         int rc;
         struct ccw_device_private *priv;
 
-        sch_set_cdev(sch, cdev);
         cdev->ccwlock = sch->lock;
 
         /* Init private data. */
@@ -1125,6 +1121,7 @@ io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
 
         /* Start async. device sensing. */
         spin_lock_irq(sch->lock);
+        sch_set_cdev(sch, cdev);
         rc = ccw_device_recognition(cdev);
         spin_unlock_irq(sch->lock);
         if (rc) {