[PATCH 4.17 002/324] vfio: ccw: fix error return in vfio_ccw_sch_event

Greg Kroah-Hartman
2018-08-23T08:39:09Z

From: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>

[ Upstream commit 2c861d89ccda2fbcea9358eff9cc5f8fae548be5 ]

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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/s390/cio/vfio_ccw_drv.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- 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 sub
{
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 sub

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 sub
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[] = {