SUNRPC: Move svcxdr_init_decode() into ->accept methods

Refactor: So that the overhaul of each ->accept method can be done
in separate smaller patches, temporarily move the
svcxdr_init_decode() call into those methods.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

net/sunrpc/auth_gss/svcauth_gss.c

@@ -1280,6 +1280,7 @@ static int svcauth_gss_legacy_init(struct svc_rqst *rqstp,
 			   rsip->major_status, rsip->minor_status))
 		goto out;
 
+	svcxdr_init_decode(rqstp);
 	ret = SVC_COMPLETE;
 out:
 	cache_put(&rsip->h, sn->rsi_cache);
@@ -1408,6 +1409,7 @@ static int svcauth_gss_proxy_init(struct svc_rqst *rqstp,
 			   ud.major_status, ud.minor_status))
 		goto out;
 
+	svcxdr_init_decode(rqstp);
 	ret = SVC_COMPLETE;
 out:
 	gss_free_in_token_pages(&ud.in_token);
@@ -1644,6 +1646,7 @@ svcauth_gss_accept(struct svc_rqst *rqstp)
 		rqstp->rq_auth_stat = rpc_autherr_badcred;
 		switch (gc->gc_svc) {
 		case RPC_GSS_SVC_NONE:
+			svcxdr_init_decode(rqstp);
 			break;
 		case RPC_GSS_SVC_INTEGRITY:
 			/* placeholders for length and seq. number: */
@@ -1653,6 +1656,7 @@ svcauth_gss_accept(struct svc_rqst *rqstp)
 					gc->gc_seq, rsci->mechctx))
 				goto garbage_args;
 			rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE;
+			svcxdr_init_decode(rqstp);
 			break;
 		case RPC_GSS_SVC_PRIVACY:
 			/* placeholders for length and seq. number: */
@@ -1662,6 +1666,7 @@ svcauth_gss_accept(struct svc_rqst *rqstp)
 					gc->gc_seq, rsci->mechctx))
 				goto garbage_args;
 			rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2;
+			svcxdr_init_decode(rqstp);
 			break;
 		default:
 			goto auth_err;

net/sunrpc/svc.c

@@ -1302,7 +1302,6 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv)
 	if (progp == NULL)
 		goto err_bad_prog;
 
-	svcxdr_init_decode(rqstp);
 	rpc_stat = progp->pg_init_request(rqstp, progp, &process);
 	switch (rpc_stat) {
 	case rpc_success:

net/sunrpc/svcauth_unix.c

@@ -762,6 +762,7 @@ svcauth_null_accept(struct svc_rqst *rqstp)
 	svc_putnl(resv, 0);
 
 	rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
+	svcxdr_init_decode(rqstp);
 	return SVC_OK;
 }
 
@@ -835,6 +836,7 @@ svcauth_tls_accept(struct svc_rqst *rqstp)
 		svc_putnl(resv, 0);
 
 	rqstp->rq_cred.cr_flavor = RPC_AUTH_TLS;
+	svcxdr_init_decode(rqstp);
 	return SVC_OK;
 }
 
@@ -900,6 +902,7 @@ svcauth_unix_accept(struct svc_rqst *rqstp)
 	svc_putnl(resv, 0);
 
 	rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
+	svcxdr_init_decode(rqstp);
 	return SVC_OK;
 
 badcred: