[PATCH RESEND 2/5] ifcvf: ignore continuous setting same staus value

[Zhu Lingshan]

User space may try to set status of same value for multiple times,
this patch can handle this case more efficiently by ignoring the
same value of status settings.

Signed-off-by: Zhu Lingshan <lingshan.zhu@xxxxxxxxx>
---
 drivers/vdpa/ifcvf/ifcvf_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
index d529ed6..63a6366 100644
--- a/drivers/vdpa/ifcvf/ifcvf_main.c
+++ b/drivers/vdpa/ifcvf/ifcvf_main.c
@@ -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);
-- 
1.8.3.1