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authorZhu Lingshan <lingshan.zhu@intel.com>2020-06-05 13:27:12 +0300
committerMichael S. Tsirkin <mst@redhat.com>2020-06-06 23:25:22 +0300
commitbb02e6e63d0e71188bc5fe5f4732e66bc8b5dceb (patch)
tree2756d7ad22cb91e2b47ade6dd8d9603eea5d05cc /drivers
parentfce8afd76e3a4d8c59c92f84f8027569fd7031d0 (diff)
downloadlinux-bb02e6e63d0e71188bc5fe5f4732e66bc8b5dceb.tar.xz
ifcvf: ignore continuous setting same status value
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/vdpa/ifcvf/ifcvf_main.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
index d529ed681fe6..63a6366b4355 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);