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[PATCH v2] vfio-ccw: Attempt to clean up all IRQs on error

From: Eric Farman
Subject: [PATCH v2] vfio-ccw: Attempt to clean up all IRQs on error
Date: Wed, 28 Apr 2021 16:36:52 +0200

The vfio_ccw_unrealize() routine makes an unconditional attempt to
unregister every IRQ notifier, though they may not have been registered
in the first place (when running on an older kernel, for example).

Let's mirror this behavior in the error cleanups in vfio_ccw_realize()
so that if/when new IRQs are added, it is less confusing to recognize
the necessary procedures. The worst case scenario would be some extra
messages about an undefined IRQ, but since this is an error exit that
won't be the only thing to worry about.

And regarding those messages, let's change it to a warning instead of
an error, to better reflect their severity. The existing code in both
paths handles everything anyway.

Signed-off-by: Eric Farman <farman@linux.ibm.com>

     - Downgrade unregister IRQ message from error to warning [CH]

 hw/vfio/ccw.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index 400bc07fe2..f64dd850db 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -470,7 +470,7 @@ static void vfio_ccw_unregister_irq_notifier(VFIOCCWDevice 
     if (vfio_set_irq_signaling(&vcdev->vdev, irq, 0,
                                VFIO_IRQ_SET_ACTION_TRIGGER, -1, &err)) {
-        error_reportf_err(err, VFIO_MSG_PREFIX, vcdev->vdev.name);
+        warn_reportf_err(err, VFIO_MSG_PREFIX, vcdev->vdev.name);
@@ -690,7 +690,7 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
     if (vcdev->crw_region) {
         vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX, &err);
         if (err) {
-            goto out_crw_notifier_err;
+            goto out_irq_notifier_err;
@@ -705,7 +705,9 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
+    vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX);
+    vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX);
     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);

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