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vhost: correctly pass error to caller in vhost_dev_enable_notifiers() 

We override the error value r in fail_vq, this will cause the caller
can't detect the failure which may cause the caller may disable the
notifiers twice if vhost is failed to start. Fix this by using another
variable to keep track the return value of set_host_notifier().

Fixes b0b3db7955 ("vhost-net: cleanup
host notifiers at last step")

Cc: qemu-stable@nongnu.org
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit 16617e36b0)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Jason Wang 2015-05-29 14:13:14 +08:00 committed by Michael Roth
parent 6130c46232
commit 81cb0a5657
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
hw/virtio/vhost.c
View File

@ -921,7 +921,7 @@ int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev)
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
VirtioBusState *vbus = VIRTIO_BUS(qbus);
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
int i, r;
int i, r, e;
if (!k->set_host_notifier) {
fprintf(stderr, "binding does not support host notifiers\n");
r = -ENOSYS;
@ -939,12 +939,12 @@ int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev)
return 0;
fail_vq:
while (--i >= 0) {
r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, false);
if (r < 0) {
e = k->set_host_notifier(qbus->parent, hdev->vq_index + i, false);
if (e < 0) {
fprintf(stderr, "vhost VQ %d notifier cleanup error: %d\n", i, -r);
fflush(stderr);
}
assert (r >= 0);
assert (e >= 0);
}
fail:
return r;