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vfio: ccw: fix error return in vfio_ccw_sch_event 

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

Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Message-Id: <20180502072559.50691-1-bjsdjshi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
zero-colors
Dong Jia Shi 2018-05-02 09:25:59 +02:00 committed by Cornelia Huck
parent 3376d98021
commit 2c861d89cc
1 changed files with 4 additions and 1 deletions
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5
drivers/s390/cio/vfio_ccw_drv.c
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@ -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[] = {