[PATCH 1/1] vfio: ccw: fix error return in vfio_ccw_sch_event

[Dong Jia Shi]

If device has not been registered, or there is a pending work,
we should reschedule a sch_event call again.

Signed-off-by: Dong Jia Shi <bjsdj...@linux.vnet.ibm.com>
---
 drivers/s390/cio/vfio_ccw_drv.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/s390/cio/vfio_ccw_drv.c b/drivers/s390/cio/vfio_ccw_drv.c
index ea6a2d0b2894..770fa9cfc310 100644
--- a/drivers/s390/cio/vfio_ccw_drv.c
+++ b/drivers/s390/cio/vfio_ccw_drv.c
@@ -177,6 +177,7 @@ static int vfio_ccw_sch_event(struct subchannel *sch, int 
process)
 {
        struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev);
        unsigned long flags;
+       int rc = -EAGAIN;
 
        spin_lock_irqsave(sch->lock, flags);
        if (!device_is_registered(&sch->dev))
@@ -187,6 +188,7 @@ static int vfio_ccw_sch_event(struct subchannel *sch, int 
process)
 
        if (cio_update_schib(sch)) {
                vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_NOT_OPER);
+               rc = 0;
                goto out_unlock;
        }
 
@@ -195,11 +197,12 @@ static int vfio_ccw_sch_event(struct subchannel *sch, int 
process)
                private->state = private->mdev ? VFIO_CCW_STATE_IDLE :
                                 VFIO_CCW_STATE_STANDBY;
        }
+       rc = 0;
 
 out_unlock:
        spin_unlock_irqrestore(sch->lock, flags);
 
-       return 0;
+       return rc;
 }
 
 static struct css_device_id vfio_ccw_sch_ids[] = {
-- 
2.13.5