From patchwork Fri Nov 11 01:14:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?0L3QsNCx?= X-Patchwork-Id: 13039469 X-Patchwork-Delegate: kuba@kernel.org 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 9CDD1C4332F for ; Fri, 11 Nov 2022 01:16:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232529AbiKKBQH (ORCPT ); Thu, 10 Nov 2022 20:16:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39418 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232225AbiKKBPP (ORCPT ); Thu, 10 Nov 2022 20:15:15 -0500 Received: from tarta.nabijaczleweli.xyz (unknown [139.28.40.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 75B002124C; Thu, 10 Nov 2022 17:14:40 -0800 (PST) Received: from tarta.nabijaczleweli.xyz (unknown [192.168.1.250]) by tarta.nabijaczleweli.xyz (Postfix) with ESMTPSA id C64A8452; Fri, 11 Nov 2022 02:14:39 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=nabijaczleweli.xyz; s=202211; t=1668129279; bh=XRnEX2VezQMkuazgxD7F8iFgqKQr9+bZpaNouakmEn4=; h=Date:From:Cc:Subject:References:In-Reply-To:From; b=LoOr1h5IxF2I5nvfVnHWo1iw273I5Po3fHa1P7xCk5EA0g2b48QrUQJzChJVVQjvj 75guOspF4pBnL3khWq7Na/Vye65srHFSgNs+4VrQYbjJMvwCrZFF7VxliDNjvE6a+I 5rGAfWL5BH8T7RX0TKtRGOKVrcJYxkqD+1gYwHTZirHOG/HSlc/EE96esqbruDZrpn Ft6+M61tZ+P1Ps1tyNdQfYEbDo4i3Bl/owITyxyDYdr7m6CqNj7usMwkOhGgJ1h9au tWxo57/wAGXRdNXJ+aFm/GENBSYsCK5LfsK09ULo1AkEuzwWqkkMUvPIjtyWNL3xb2 84hhtoBc1mr+Q== Date: Fri, 11 Nov 2022 02:14:38 +0100 From: Ahelenia =?utf-8?q?Ziemia=C5=84ska?= Cc: Jonathan Corbet , Federico Vaga , Alex Shi , Yanteng Si , Hu Haowen , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Greg Kroah-Hartman , Jiri Slaby , Oliver Hartkopp , Sebastian Andrzej Siewior , Marc Kleine-Budde , Duoming Zhou , Huang Pei , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc-tw-discuss@lists.sourceforge.net, netdev@vger.kernel.org Subject: [PATCH v3 12/15] drivers: net: slip: remove SLIP_MAGIC Message-ID: <570435f7a54ff9fbb55a7e970ae8f082b88a6454.1668128257.git.nabijaczleweli@nabijaczleweli.xyz> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: NeoMutt/20220429 To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org According to Greg, in the context of magic numbers as defined in magic-number.rst, "the tty layer should not need this and I'll gladly take patches". We have largely moved away from this approach, and we have better debugging instrumentation nowadays: kill it. Additionally, all SLIP_MAGIC checks just early-exit instead of noting the bug, so they're detrimental, if anything. Link: https://lore.kernel.org/linux-doc/YyMlovoskUcHLEb7@kroah.com/ Reviewed-by: Oliver Hartkopp Acked-by: Jakub Kicinski Signed-off-by: Ahelenia Ziemiańska --- Documentation/process/magic-number.rst | 1 - .../translations/it_IT/process/magic-number.rst | 1 - .../translations/zh_CN/process/magic-number.rst | 1 - .../translations/zh_TW/process/magic-number.rst | 1 - drivers/net/slip/slip.c | 11 +++++------ drivers/net/slip/slip.h | 4 ---- 6 files changed, 5 insertions(+), 14 deletions(-) diff --git a/Documentation/process/magic-number.rst b/Documentation/process/magic-number.rst index 3b3e607e1cbc..e59c707ec785 100644 --- a/Documentation/process/magic-number.rst +++ b/Documentation/process/magic-number.rst @@ -69,6 +69,5 @@ Changelog:: Magic Name Number Structure File ===================== ================ ======================== ========================================== FASYNC_MAGIC 0x4601 fasync_struct ``include/linux/fs.h`` -SLIP_MAGIC 0x5302 slip ``drivers/net/slip.h`` CCB_MAGIC 0xf2691ad2 ccb ``drivers/scsi/ncr53c8xx.c`` ===================== ================ ======================== ========================================== diff --git a/Documentation/translations/it_IT/process/magic-number.rst b/Documentation/translations/it_IT/process/magic-number.rst index e8c659b6a743..37a539867b6f 100644 --- a/Documentation/translations/it_IT/process/magic-number.rst +++ b/Documentation/translations/it_IT/process/magic-number.rst @@ -75,6 +75,5 @@ Registro dei cambiamenti:: Nome magico Numero Struttura File ===================== ================ ======================== ========================================== FASYNC_MAGIC 0x4601 fasync_struct ``include/linux/fs.h`` -SLIP_MAGIC 0x5302 slip ``drivers/net/slip.h`` CCB_MAGIC 0xf2691ad2 ccb ``drivers/scsi/ncr53c8xx.c`` ===================== ================ ======================== ========================================== diff --git a/Documentation/translations/zh_CN/process/magic-number.rst b/Documentation/translations/zh_CN/process/magic-number.rst index 2105af32187c..8a3a3e872c52 100644 --- a/Documentation/translations/zh_CN/process/magic-number.rst +++ b/Documentation/translations/zh_CN/process/magic-number.rst @@ -58,6 +58,5 @@ Linux 魔术数 魔术数名 数字 结构 文件 ===================== ================ ======================== ========================================== FASYNC_MAGIC 0x4601 fasync_struct ``include/linux/fs.h`` -SLIP_MAGIC 0x5302 slip ``drivers/net/slip.h`` CCB_MAGIC 0xf2691ad2 ccb ``drivers/scsi/ncr53c8xx.c`` ===================== ================ ======================== ========================================== diff --git a/Documentation/translations/zh_TW/process/magic-number.rst b/Documentation/translations/zh_TW/process/magic-number.rst index 793a0ae9fb7c..7ace7834f7f9 100644 --- a/Documentation/translations/zh_TW/process/magic-number.rst +++ b/Documentation/translations/zh_TW/process/magic-number.rst @@ -61,6 +61,5 @@ Linux 魔術數 魔術數名 數字 結構 文件 ===================== ================ ======================== ========================================== FASYNC_MAGIC 0x4601 fasync_struct ``include/linux/fs.h`` -SLIP_MAGIC 0x5302 slip ``drivers/net/slip.h`` CCB_MAGIC 0xf2691ad2 ccb ``drivers/scsi/ncr53c8xx.c`` ===================== ================ ======================== ========================================== diff --git a/drivers/net/slip/slip.c b/drivers/net/slip/slip.c index 6865d32270e5..95f5c79772e7 100644 --- a/drivers/net/slip/slip.c +++ b/drivers/net/slip/slip.c @@ -426,7 +426,7 @@ static void slip_transmit(struct work_struct *work) spin_lock_bh(&sl->lock); /* First make sure we're connected. */ - if (!sl->tty || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) { + if (!sl->tty || !netif_running(sl->dev)) { spin_unlock_bh(&sl->lock); return; } @@ -690,7 +690,7 @@ static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp, { struct slip *sl = tty->disc_data; - if (!sl || sl->magic != SLIP_MAGIC || !netif_running(sl->dev)) + if (!sl || !netif_running(sl->dev)) return; /* Read the characters out of the buffer */ @@ -761,7 +761,6 @@ static struct slip *sl_alloc(void) sl = netdev_priv(dev); /* Initialize channel control data */ - sl->magic = SLIP_MAGIC; sl->dev = dev; spin_lock_init(&sl->lock); INIT_WORK(&sl->tx_work, slip_transmit); @@ -809,7 +808,7 @@ static int slip_open(struct tty_struct *tty) err = -EEXIST; /* First make sure we're not already connected. */ - if (sl && sl->magic == SLIP_MAGIC) + if (sl) goto err_exit; /* OK. Find a free SLIP channel to use. */ @@ -886,7 +885,7 @@ static void slip_close(struct tty_struct *tty) struct slip *sl = tty->disc_data; /* First make sure we're connected. */ - if (!sl || sl->magic != SLIP_MAGIC || sl->tty != tty) + if (!sl || sl->tty != tty) return; spin_lock_bh(&sl->lock); @@ -1080,7 +1079,7 @@ static int slip_ioctl(struct tty_struct *tty, unsigned int cmd, int __user *p = (int __user *)arg; /* First make sure we're connected. */ - if (!sl || sl->magic != SLIP_MAGIC) + if (!sl) return -EINVAL; switch (cmd) { diff --git a/drivers/net/slip/slip.h b/drivers/net/slip/slip.h index 3d7f88b330c1..d7dbedd27669 100644 --- a/drivers/net/slip/slip.h +++ b/drivers/net/slip/slip.h @@ -50,8 +50,6 @@ struct slip { - int magic; - /* Various fields. */ struct tty_struct *tty; /* ptr to TTY structure */ struct net_device *dev; /* easy for intr handling */ @@ -100,6 +98,4 @@ struct slip { #endif }; -#define SLIP_MAGIC 0x5302 - #endif /* _LINUX_SLIP.H */