Patch "s390/cio: unregister device when the only path is gone" has been added to the 6.3-stable tree

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This is a note to let you know that I've just added the patch titled

    s390/cio: unregister device when the only path is gone

to the 6.3-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     s390-cio-unregister-device-when-the-only-path-is-gon.patch
and it can be found in the queue-6.3 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 970d88e55088a168f0af5bf7378d38056d5d84b9
Author: Vineeth Vijayan <vneethv@xxxxxxxxxxxxx>
Date:   Thu May 4 20:53:20 2023 +0200

    s390/cio: unregister device when the only path is gone
    
    [ Upstream commit 89c0c62e947a01e7a36b54582fd9c9e346170255 ]
    
    Currently, if the device is offline and all the channel paths are
    either configured or varied offline, the associated subchannel gets
    unregistered. Don't unregister the subchannel, instead unregister
    offline device.
    
    Signed-off-by: Vineeth Vijayan <vneethv@xxxxxxxxxxxxx>
    Reviewed-by: Peter Oberparleiter <oberpar@xxxxxxxxxxxxx>
    Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index d5c43e9b51289..c0d620ffea618 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -1376,6 +1376,7 @@ void ccw_device_set_notoper(struct ccw_device *cdev)
 enum io_sch_action {
 	IO_SCH_UNREG,
 	IO_SCH_ORPH_UNREG,
+	IO_SCH_UNREG_CDEV,
 	IO_SCH_ATTACH,
 	IO_SCH_UNREG_ATTACH,
 	IO_SCH_ORPH_ATTACH,
@@ -1408,7 +1409,7 @@ static enum io_sch_action sch_get_action(struct subchannel *sch)
 	}
 	if ((sch->schib.pmcw.pam & sch->opm) == 0) {
 		if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK)
-			return IO_SCH_UNREG;
+			return IO_SCH_UNREG_CDEV;
 		return IO_SCH_DISC;
 	}
 	if (device_is_disconnected(cdev))
@@ -1470,6 +1471,7 @@ static int io_subchannel_sch_event(struct subchannel *sch, int process)
 	case IO_SCH_ORPH_ATTACH:
 		ccw_device_set_disconnected(cdev);
 		break;
+	case IO_SCH_UNREG_CDEV:
 	case IO_SCH_UNREG_ATTACH:
 	case IO_SCH_UNREG:
 		if (!cdev)
@@ -1503,6 +1505,7 @@ static int io_subchannel_sch_event(struct subchannel *sch, int process)
 		if (rc)
 			goto out;
 		break;
+	case IO_SCH_UNREG_CDEV:
 	case IO_SCH_UNREG_ATTACH:
 		spin_lock_irqsave(sch->lock, flags);
 		sch_set_cdev(sch, NULL);



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