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hw/virtio: handle un-configured shutdown in virtio-pci

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The assert() protecting against leakage is a little aggressive and
causes needless crashes if a device is shutdown without having been
configured. In this case no descriptors are lost because none have
been assigned.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20220728135503.1060062-4-alex.bennee@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Alex Bennée 2022-07-28 14:55:02 +01:00 committed by Michael S. Tsirkin
parent f20400ed0d
commit 5a9d5f09b1
1 changed files with 7 additions and 2 deletions
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9
hw/virtio/virtio-pci.c
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@ -996,9 +996,14 @@ static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
nvqs = MIN(nvqs, VIRTIO_QUEUE_MAX);
/* When deassigning, pass a consistent nvqs value
* to avoid leaking notifiers.
/*
* When deassigning, pass a consistent nvqs value to avoid leaking
* notifiers. But first check we've actually been configured, exit
* early if we haven't.
*/
if (!assign && !proxy->nvqs_with_notifiers) {
return 0;
}
assert(assign || nvqs == proxy->nvqs_with_notifiers);
proxy->nvqs_with_notifiers = nvqs;