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s390/cio: Set vfio-ccw FSM state before ioeventfd

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Otherwise, the guest can believe it's okay to start another I/O
and bump into the non-idle state.  This results in a cc=2 (with
the asynchronous CSCH/HSCH code) returned to the guest, which is
unfortunate since everything is otherwise working normally.

Signed-off-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Message-Id: <20190514234248.36203-3-farman@linux.ibm.com>
Reviewed-by: Farhan Ali <alifm@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Eric Farman 2019-05-15 01:42:43 +02:00 committed by Cornelia Huck
parent 15f0eb3d6a
commit 4e31d6aecf
1 changed files with 3 additions and 3 deletions
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6
drivers/s390/cio/vfio_ccw_drv.c
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@ -95,11 +95,11 @@ static void vfio_ccw_sch_io_todo(struct work_struct *work)
memcpy(private->io_region->irb_area, irb, sizeof(*irb));
mutex_unlock(&private->io_mutex);
if (private->io_trigger)
eventfd_signal(private->io_trigger, 1);
if (private->mdev && is_final)
private->state = VFIO_CCW_STATE_IDLE;
if (private->io_trigger)
eventfd_signal(private->io_trigger, 1);
}
/*