IB/{core,hw}: Have ib_umem_get extract the ib_ucontext from ib_udata

ib_umem_get() can only be called in a method callback, which always has a
udata parameter. This allows ib_umem_get() to derive the ucontext pointer
directly from the udata without requiring the drivers to find it in some
way or another.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Shamir Rabinovitch <shamir.rabinovitch@oracle.com>

drivers/infiniband/hw/ocrdma/ocrdma_verbs.c

@@ -916,7 +916,7 @@ struct ib_mr *ocrdma_reg_user_mr(struct ib_pd *ibpd, u64 start, u64 len,
 	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
 	if (!mr)
 		return ERR_PTR(status);
-	mr->umem = ib_umem_get(ibpd->uobject->context, start, len, acc, 0);
+	mr->umem = ib_umem_get(udata, start, len, acc, 0);
 	if (IS_ERR(mr->umem)) {
 		status = -EFAULT;
 		goto umem_err;