add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/drivers/pps/clients/pps-ldisc.c
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@@ -1,22 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * pps-ldisc.c -- PPS line discipline
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  *
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- *
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  * Copyright (C) 2008	Rodolfo Giometti <giometti@linux.it>
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- *
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- *   This program is free software; you can redistribute it and/or modify
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- *   it under the terms of the GNU General Public License as published by
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- *   the Free Software Foundation; either version 2 of the License, or
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- *   (at your option) any later version.
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- *
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- *   This program is distributed in the hope that it will be useful,
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- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
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- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- *   GNU General Public License for more details.
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- *
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- *   You should have received a copy of the GNU General Public License
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- *   along with this program; if not, write to the Free Software
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- *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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  */
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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@@ -72,9 +58,9 @@
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 	pps = pps_register_source(&info, PPS_CAPTUREBOTH | \
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 				PPS_OFFSETASSERT | PPS_OFFSETCLEAR);
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-	if (pps == NULL) {
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+	if (IS_ERR(pps)) {
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 		pr_err("cannot register PPS source \"%s\"\n", info.path);
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-		return -ENOMEM;
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+		return PTR_ERR(pps);
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 	}
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 	pps->lookup_cookie = tty;
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