vdpa_sim: add work_fn in vdpasim_dev_attr

stable inclusion
from stable-v5.11
commit a13b5918
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5WXCZ
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a13b5918fdd0dd7987aa5f3c202f68ed6ad468bb

----------------------------------------------------------------------

Rename vdpasim_work() in vdpasim_net_work() and add it to
the vdpasim_dev_attr structure.
Co-developed-by: NMax Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: NMax Gurtovoy <mgurtovoy@nvidia.com>
Acked-by: NJason Wang <jasowang@redhat.com>
Signed-off-by: NStefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20201215144256.155342-10-sgarzare@redhat.comSigned-off-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NPengyuan Zhao <zhaopengyuan@hisilicon.com>

drivers/vdpa/vdpa_sim/vdpa_sim.c

@@ -75,6 +75,8 @@ struct vdpasim_dev_attr {
 	size_t config_size;
 	int nvqs;
 	u32 id;
+
+	work_func_t work_fn;
 	void (*get_config)(struct vdpasim *vdpasim, void *config);
 };
 
@@ -169,7 +171,7 @@ 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);
@@ -376,7 +378,7 @@ 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);
 
@@ -766,6 +768,7 @@ static int __init vdpasim_dev_init(void)
 
 	dev_attr.id = VIRTIO_ID_NET;
 	dev_attr.nvqs = VDPASIM_VQ_NUM;
+	dev_attr.work_fn = vdpasim_net_work;
 	dev_attr.config_size = sizeof(struct virtio_net_config);
 	dev_attr.get_config = vdpasim_net_get_config;