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path: root/drivers/s390/cio/vfio_ccw_drv.c
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Diffstat (limited to 'drivers/s390/cio/vfio_ccw_drv.c')
-rw-r--r--drivers/s390/cio/vfio_ccw_drv.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/s390/cio/vfio_ccw_drv.c b/drivers/s390/cio/vfio_ccw_drv.c
index 0b3b9de45c60..5ea0da1dd954 100644
--- a/drivers/s390/cio/vfio_ccw_drv.c
+++ b/drivers/s390/cio/vfio_ccw_drv.c
@@ -84,7 +84,9 @@ static void vfio_ccw_sch_io_todo(struct work_struct *work)
if (is_final)
cp_free(&private->cp);
}
+ mutex_lock(&private->io_mutex);
memcpy(private->io_region->irb_area, irb, sizeof(*irb));
+ mutex_unlock(&private->io_mutex);
if (private->io_trigger)
eventfd_signal(private->io_trigger, 1);
@@ -129,6 +131,7 @@ static int vfio_ccw_sch_probe(struct subchannel *sch)
private->sch = sch;
dev_set_drvdata(&sch->dev, private);
+ mutex_init(&private->io_mutex);
spin_lock_irq(sch->lock);
private->state = VFIO_CCW_STATE_NOT_OPER;