[PULL 7/7] vfio-ccw: Attempt to clean up all IRQs on error

From: Cornelia Huck <cohuck@redhat.com>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: Eric Farman <farman@linux.ibm.com>,
	qemu-s390x@nongnu.org, Cornelia Huck <cohuck@redhat.com>,
	qemu-devel@nongnu.org, Matthew Rosato <mjrosato@linux.ibm.com>
Subject: [PULL 7/7] vfio-ccw: Attempt to clean up all IRQs on error
Date: Thu,  6 May 2021 17:44:23 +0200	[thread overview]
Message-ID: <20210506154423.459930-8-cohuck@redhat.com> (raw)
In-Reply-To: <20210506154423.459930-1-cohuck@redhat.com>

From: Eric Farman <farman@linux.ibm.com>

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>
Acked-by: Matthew Rosato <mjrosato@linux.ibm.com>
Message-Id: <20210428143652.1571487-1-farman@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
---
 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 7c058d13e8ce..139a3d9d1b95 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -469,7 +469,7 @@ static void vfio_ccw_unregister_irq_notifier(VFIOCCWDevice *vcdev,
 
     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);
     }
 
     qemu_set_fd_handler(event_notifier_get_fd(notifier),
@@ -689,7 +689,7 @@ 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;
         }
     }
 
@@ -704,7 +704,9 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
 
     return;
 
-out_crw_notifier_err:
+out_irq_notifier_err:
+    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);
 out_io_notifier_err:
     vfio_ccw_put_region(vcdev);
-- 
2.30.2


