RDMA/core: Fix ib_qp_usecnt_dec() called when error

[ Upstream commit 7c4a539ec3 ]

ib_destroy_qp() would called by ib_create_qp_user() if error, the former
contains ib_qp_usecnt_dec(), but ib_qp_usecnt_inc() was not called before.

So move ib_qp_usecnt_inc() into create_qp().

Fixes: d2b10794fc ("RDMA/core: Create clean QP creations interface for uverbs")
Link: https://lore.kernel.org/r/20220303024232.2847388-1-yajun.deng@linux.dev
Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/infiniband/core/uverbs_cmd.c

@@ -1438,7 +1438,6 @@ static int create_qp(struct uverbs_attr_bundle *attrs,
 		ret = PTR_ERR(qp);
 		goto err_put;
 	}
-	ib_qp_usecnt_inc(qp);
 
 	obj->uevent.uobject.object = qp;
 	obj->uevent.event_file = READ_ONCE(attrs->ufile->default_async_file);

drivers/infiniband/core/uverbs_std_types_qp.c

@@ -254,7 +254,6 @@ static int UVERBS_HANDLER(UVERBS_METHOD_QP_CREATE)(
 		ret = PTR_ERR(qp);
 		goto err_put;
 	}
-	ib_qp_usecnt_inc(qp);
 
 	if (attr.qp_type == IB_QPT_XRC_TGT) {
 		obj->uxrcd = container_of(xrcd_uobj, struct ib_uxrcd_object,

drivers/infiniband/core/verbs.c

@@ -1253,6 +1253,7 @@ static struct ib_qp *create_qp(struct ib_device *dev, struct ib_pd *pd,
 	if (ret)
 		goto err_security;
 
+	ib_qp_usecnt_inc(qp);
 	rdma_restrack_add(&qp->res);
 	return qp;
 
@@ -1353,8 +1354,6 @@ struct ib_qp *ib_create_qp_kernel(struct ib_pd *pd,
 	if (IS_ERR(qp))
 		return qp;
 
-	ib_qp_usecnt_inc(qp);
-
 	if (qp_init_attr->cap.max_rdma_ctxs) {
 		ret = rdma_rw_init_mrs(qp, qp_init_attr);
 		if (ret)