From patchwork Wed Aug 16 10:55:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Jiri Slaby \(SUSE\)" X-Patchwork-Id: 714570 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D9741C04A94 for ; Wed, 16 Aug 2023 10:56:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244159AbjHPK4I (ORCPT ); Wed, 16 Aug 2023 06:56:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59532 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244007AbjHPKzn (ORCPT ); Wed, 16 Aug 2023 06:55:43 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1477F1984; Wed, 16 Aug 2023 03:55:42 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id A64B064FFF; Wed, 16 Aug 2023 10:55:41 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 08249C433C7; Wed, 16 Aug 2023 10:55:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1692183341; bh=bQUbntuVjuhv84eUfQ4u1fCZj9wEJvWe7HvkbIm42oc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UbbghvJxgjg9AwRxAtkDuW2q2OsKG4Lt4NHz3/3X0C+UX4aSUTaD3hHyV6Jbi0uYs P2fzsf/jZuWL94dJ6yAcdV32YHPXmkSrpr9rlQbpEUsKOnaX48p68s2aCxiRLs8Ztg IXDM9qZ6uw1z6VIWYvdsFs6Ewd0JKwupS79yZkoFtoSvE9gXaTl0DxS6RFxoE9W8Wh 5RvxbKfnfQvd2VFT+rbGecTZe1aDIZAY0o52rfrqrcVjTgDb7S50QeTG7dP8UwkiLB JfnfrjeFeQ13j4PArnwiN5loY6FGB4WQbnh7b4BgqdJmeXSD2fY4qe0/c3fR0dlsb8 3WH1OwVcGynTQ== From: "Jiri Slaby (SUSE)" To: gregkh@linuxfoundation.org Cc: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, "Jiri Slaby (SUSE)" Subject: [PATCH 05/10] tty: tty_buffer: switch insert functions to size_t Date: Wed, 16 Aug 2023 12:55:25 +0200 Message-ID: <20230816105530.3335-6-jirislaby@kernel.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230816105530.3335-1-jirislaby@kernel.org> References: <20230816105530.3335-1-jirislaby@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org All the functions accept size_t as a size argument. They finally return the same size (or less). It is quite unexpected that they return a signed value and can confuse users to check for negative values. Instead, return the same size_t as accepted to make clear we return values >= 0, where zero in fact means failure. Signed-off-by: Jiri Slaby (SUSE) --- drivers/tty/tty_buffer.c | 12 ++++++------ include/linux/tty_flip.h | 24 ++++++++++++------------ 2 files changed, 18 insertions(+), 18 deletions(-) diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c index c101b4ab737e..598891e53031 100644 --- a/drivers/tty/tty_buffer.c +++ b/drivers/tty/tty_buffer.c @@ -303,16 +303,16 @@ int tty_buffer_request_room(struct tty_port *port, size_t size) } EXPORT_SYMBOL_GPL(tty_buffer_request_room); -int __tty_insert_flip_string_flags(struct tty_port *port, const u8 *chars, - const u8 *flags, bool mutable_flags, - size_t size) +size_t __tty_insert_flip_string_flags(struct tty_port *port, const u8 *chars, + const u8 *flags, bool mutable_flags, + size_t size) { bool need_flags = mutable_flags || flags[0] != TTY_NORMAL; - int copied = 0; + size_t copied = 0; do { - int goal = min_t(size_t, size - copied, TTY_BUFFER_PAGE); - int space = __tty_buffer_request_room(port, goal, need_flags); + size_t goal = min_t(size_t, size - copied, TTY_BUFFER_PAGE); + size_t space = __tty_buffer_request_room(port, goal, need_flags); struct tty_buffer *tb = port->buf.tail; if (unlikely(space == 0)) diff --git a/include/linux/tty_flip.h b/include/linux/tty_flip.h index 8b781f709605..569747364ae5 100644 --- a/include/linux/tty_flip.h +++ b/include/linux/tty_flip.h @@ -10,9 +10,9 @@ struct tty_ldisc; int tty_buffer_set_limit(struct tty_port *port, int limit); unsigned int tty_buffer_space_avail(struct tty_port *port); int tty_buffer_request_room(struct tty_port *port, size_t size); -int __tty_insert_flip_string_flags(struct tty_port *port, const u8 *chars, - const u8 *flags, bool mutable_flags, - size_t size); +size_t __tty_insert_flip_string_flags(struct tty_port *port, const u8 *chars, + const u8 *flags, bool mutable_flags, + size_t size); int tty_prepare_flip_string(struct tty_port *port, u8 **chars, size_t size); void tty_flip_buffer_push(struct tty_port *port); int __tty_insert_flip_char(struct tty_port *port, u8 ch, u8 flag); @@ -29,9 +29,9 @@ int __tty_insert_flip_char(struct tty_port *port, u8 ch, u8 flag); * * Returns: the number added. */ -static inline int tty_insert_flip_string_fixed_flag(struct tty_port *port, - const u8 *chars, u8 flag, - size_t size) +static inline size_t tty_insert_flip_string_fixed_flag(struct tty_port *port, + const u8 *chars, u8 flag, + size_t size) { return __tty_insert_flip_string_flags(port, chars, &flag, false, size); } @@ -48,15 +48,15 @@ static inline int tty_insert_flip_string_fixed_flag(struct tty_port *port, * * Returns: the number added. */ -static inline int tty_insert_flip_string_flags(struct tty_port *port, - const u8 *chars, const u8 *flags, - size_t size) +static inline size_t tty_insert_flip_string_flags(struct tty_port *port, + const u8 *chars, + const u8 *flags, size_t size) { return __tty_insert_flip_string_flags(port, chars, flags, true, size); } -static inline int tty_insert_flip_char(struct tty_port *port, u8 ch, u8 flag) +static inline size_t tty_insert_flip_char(struct tty_port *port, u8 ch, u8 flag) { struct tty_buffer *tb = port->buf.tail; int change; @@ -71,8 +71,8 @@ static inline int tty_insert_flip_char(struct tty_port *port, u8 ch, u8 flag) return __tty_insert_flip_char(port, ch, flag); } -static inline int tty_insert_flip_string(struct tty_port *port, - const u8 *chars, size_t size) +static inline size_t tty_insert_flip_string(struct tty_port *port, + const u8 *chars, size_t size) { return tty_insert_flip_string_fixed_flag(port, chars, TTY_NORMAL, size); }