[PATCH 5.15 145/276] s390/cio: unregister the subchannel while purging

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vineeth Vijayan <vneethv@linux.ibm.com>

[ Upstream commit fa172f043f5bc21c357c54a6ca2e9c8acd18c3db ]

The cio_ignore list is used to create and maintain the list of devices
which is to be ignored by Linux. During boot-time, this list is adjusted
and accommodate all the devices which are configured on the HMC
interface. Once these devices are accessible, they are then available to
Linux and set online.

cio_ignore purge function should align with this functionality. But
currently, the subchannel associated with the offline-devices are not
unregistered during purge. Add an explicit subchannel-unregister function
in the purge_fn callback.

Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Stable-dep-of: 9daa5a879586 ("s390/cio: Update purge function to unregister the unused subchannels")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/s390/cio/device.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index c2ed91b69f079..70c5b85d2dfc9 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -1327,6 +1327,7 @@ static int purge_fn(struct device *dev, void *data)
 {
 	struct ccw_device *cdev = to_ccwdev(dev);
 	struct ccw_dev_id *id = &cdev->private->dev_id;
+	struct subchannel *sch = to_subchannel(cdev->dev.parent);
 
 	spin_lock_irq(cdev->ccwlock);
 	if (is_blacklisted(id->ssid, id->devno) &&
@@ -1335,6 +1336,7 @@ static int purge_fn(struct device *dev, void *data)
 		CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid,
 			      id->devno);
 		ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
+		css_sched_sch_todo(sch, SCH_TODO_UNREG);
 		atomic_set(&cdev->private->onoff, 0);
 	}
 	spin_unlock_irq(cdev->ccwlock);
-- 
2.51.0