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ifcvf: ignore continuous setting same status value

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User space may try to set status of same value multiple times,
this patch handles this case more efficiently by ignoring the
setting of the same status value.

Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
Link: https://lore.kernel.org/r/1591352835-22441-3-git-send-email-lingshan.zhu@intel.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhu Lingshan 2020-06-05 18:27:12 +08:00 committed by Michael S. Tsirkin
parent fce8afd76e
commit bb02e6e63d
1 changed files with 3 additions and 0 deletions
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3
drivers/vdpa/ifcvf/ifcvf_main.c
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@ -179,6 +179,9 @@ static void ifcvf_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status)
adapter = dev_get_drvdata(vdpa_dev->dev.parent);
status_old = ifcvf_get_status(vf);
if (status_old == status)
return;
if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) &&
!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
ifcvf_stop_datapath(adapter);