diff mbox series

[v3,02/11] vfio/ccw: Fix FSM state if mdev probe fails

Message ID 20220630203647.2529815-3-farman@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series s390/vfio-ccw rework | expand

Commit Message

Eric Farman June 30, 2022, 8:36 p.m. UTC
The FSM is in STANDBY state when arriving in vfio_ccw_mdev_probe(),
and this routine converts it to IDLE as part of its processing.
The error exit sets it to IDLE (again) but clears the private->mdev

The FSM should of course be managing the state itself, but the
correct thing for vfio_ccw_mdev_probe() to do would be to put
the state back the way it found it.

The corresponding check of private->mdev in vfio_ccw_sch_io_todo()
can be removed, since the distinction is unnecessary at this point.

Fixes: 3bf1311f351ef ("vfio/ccw: Convert to use vfio_register_emulated_iommu_dev()")
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
 drivers/s390/cio/vfio_ccw_drv.c | 5 +++--
 drivers/s390/cio/vfio_ccw_ops.c | 2 +-
 2 files changed, 4 insertions(+), 3 deletions(-)
diff mbox series


diff --git a/drivers/s390/cio/vfio_ccw_drv.c b/drivers/s390/cio/vfio_ccw_drv.c
index 35055eb94115..179eb614fa5b 100644
--- a/drivers/s390/cio/vfio_ccw_drv.c
+++ b/drivers/s390/cio/vfio_ccw_drv.c
@@ -106,9 +106,10 @@  static void vfio_ccw_sch_io_todo(struct work_struct *work)
 	 * Reset to IDLE only if processing of a channel program
 	 * has finished. Do not overwrite a possible processing
-	 * state if the final interrupt was for HSCH or CSCH.
+	 * state if the interrupt was unsolicited, or if the final
+	 * interrupt was for HSCH or CSCH.
-	if (private->mdev && cp_is_finished)
+	if (cp_is_finished)
 		private->state = VFIO_CCW_STATE_IDLE;
 	if (private->io_trigger)
diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index 0e05bff78b8e..9a05dadcbb75 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -146,7 +146,7 @@  static int vfio_ccw_mdev_probe(struct mdev_device *mdev)
 	private->mdev = NULL;
-	private->state = VFIO_CCW_STATE_IDLE;
+	private->state = VFIO_CCW_STATE_STANDBY;
 	return ret;