linux-kernel - [PATCH v3 4/6] vfio: ccw: Rework subchannel state on sch

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Message-Id: <1543408867-16465-5-git-send-email-pmorel@linux.ibm.com>
Date:   Wed, 28 Nov 2018 13:41:05 +0100
From:   Pierre Morel <pmorel@...ux.ibm.com>
To:     pasic@...ux.vnet.ibm.com
Cc:     cohuck@...hat.com, farman@...ux.ibm.com, alifm@...ux.ibm.com,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: [PATCH v3 4/6] vfio: ccw: Rework subchannel state on sch_event

We do not need to change the state when handling events.

If we can not update the SCHIB it is an unrecoverable error
independent of the real sub channel.

Signed-off-by: Pierre Morel <pmorel@...ux.ibm.com>
---
 drivers/s390/cio/vfio_ccw_drv.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/drivers/s390/cio/vfio_ccw_drv.c b/drivers/s390/cio/vfio_ccw_drv.c
index 1779b46..687ca42 100644
--- a/drivers/s390/cio/vfio_ccw_drv.c
+++ b/drivers/s390/cio/vfio_ccw_drv.c
@@ -198,18 +198,9 @@ static int vfio_ccw_sch_event(struct subchannel *sch, int process)
 	if (work_pending(&sch->todo_work))
 		goto out_unlock;
 
-	if (cio_update_schib(sch)) {
-		vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_NOT_OPER);
-		rc = 0;
-		goto out_unlock;
-	}
-
-	private = dev_get_drvdata(&sch->dev);
-	if (private->state == VFIO_CCW_STATE_NOT_OPER) {
-		private->state = private->mdev ? VFIO_CCW_STATE_IDLE :
-				 VFIO_CCW_STATE_STANDBY;
-	}
 	rc = 0;
+	if (cio_update_schib(sch) && private)
+		vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_NOT_OPER);
 
 out_unlock:
 	spin_unlock_irqrestore(sch->lock, flags);
-- 
2.7.4