vdpa_sim: add work_fn in vdpasim_dev_attr

Rename vdpasim_work() in vdpasim_net_work() and add it to
the vdpasim_dev_attr structure.
Co-developed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20201215144256.155342-10-sgarzare@redhat.comSigned-off-by: Michael S. Tsirkin <mst@redhat.com>

drivers/vdpa/vdpa_sim/vdpa_sim.c

@@ -70,6 +70,8 @@ struct vdpasim_dev_attr {
 	u64 supported_features;
 	int nvqs;
 	u32 id;
+
+	work_func_t work_fn;
 };
 
 /* State of each vdpasim device */
@@ -163,7 +165,7 @@ static void vdpasim_reset(struct vdpasim *vdpasim)
 	++vdpasim->generation;
 }
 
-static void vdpasim_work(struct work_struct *work)
+static void vdpasim_net_work(struct work_struct *work)
 {
 	struct vdpasim *vdpasim = container_of(work, struct
 						 vdpasim, work);
@@ -370,7 +372,7 @@ static struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr)
 		goto err_alloc;
 
 	vdpasim->dev_attr = *dev_attr;
-	INIT_WORK(&vdpasim->work, vdpasim_work);
+	INIT_WORK(&vdpasim->work, dev_attr->work_fn);
 	spin_lock_init(&vdpasim->lock);
 	spin_lock_init(&vdpasim->iommu_lock);
 
@@ -740,6 +742,7 @@ static int __init vdpasim_dev_init(void)
 	dev_attr.id = VIRTIO_ID_NET;
 	dev_attr.supported_features = VDPASIM_NET_FEATURES;
 	dev_attr.nvqs = VDPASIM_VQ_NUM;
+	dev_attr.work_fn = vdpasim_net_work;
 
 	vdpasim_dev = vdpasim_create(&dev_attr);