From mboxrd@z Thu Jan 1 00:00:00 1970 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 0F388EE49A3 for ; Tue, 22 Aug 2023 13:05:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235941AbjHVNFu (ORCPT ); Tue, 22 Aug 2023 09:05:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47142 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232195AbjHVNFu (ORCPT ); Tue, 22 Aug 2023 09:05:50 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 44A69D7; Tue, 22 Aug 2023 06:05:48 -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 CF19860C63; Tue, 22 Aug 2023 13:05:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 98514C433C8; Tue, 22 Aug 2023 13:05:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1692709547; bh=pvHZnfwRZa1Zh/yZFcFxSAFf+i6k+ATkzimoxm/IRYU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=JFQpr0Hk8C5t5H3opAu/rKK5NN+OqB2gfyHncPTnSiUXhWnpDulEpKlSttKjDe+rf 10JLxdKtdD1n4KO2D5wl37DkRJiHxBbNPd1kiastI1dZuFViUm0kv8vcTvSzaMFZty O2l7DXJZJ9iBVSJvE+FyZhBIoqH+ZCfnjVNTf7Rw= Date: Tue, 22 Aug 2023 15:05:44 +0200 From: Greg KH To: "D. Starke" Cc: linux-serial@vger.kernel.org, jirislaby@kernel.org, ilpo.jarvinen@linux.intel.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH v6 1/9] tty: n_gsm: add restart flag to DLC specific ioctl config Message-ID: <2023082227-morse-dreaded-4cd5@gregkh> References: <20230817093231.2317-1-daniel.starke@siemens.com> <2023082241-stagnant-parched-215d@gregkh> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2023082241-stagnant-parched-215d@gregkh> Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org On Tue, Aug 22, 2023 at 03:05:10PM +0200, Greg KH wrote: > On Thu, Aug 17, 2023 at 11:32:23AM +0200, D. Starke wrote: > > From: Daniel Starke > > > > Currently, changing the parameters of a DLCI gives no direct control to the > > user whether this should trigger a channel reset or not. The decision is > > solely made by the driver based on the assumption which parameter changes > > are compatible or not. Therefore, the user has no means to perform an > > automatic channel reset after parameter configuration for non-conflicting > > changes. > > > > Add the parameter 'flags' to 'gsm_dlci_config' to force a channel reset > > after ioctl setting regardless of whether the changes made require this or > > not by setting this to 'GSM_FL_RESTART'. > > > > Note that 'GSM_FL_RESTART' is currently the only allow flag to allow > > additions here. > > > > Signed-off-by: Daniel Starke > > --- > > drivers/tty/n_gsm.c | 4 ++++ > > include/uapi/linux/gsmmux.h | 15 ++++++++++++++- > > 2 files changed, 18 insertions(+), 1 deletion(-) > > > > v5 -> v6: > > No changes. > > > > Link: https://lore.kernel.org/all/20230517155704.5701-1-daniel.starke@siemens.com/ > > > > diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c > > index 42759500b79e..a4268515920e 100644 > > --- a/drivers/tty/n_gsm.c > > +++ b/drivers/tty/n_gsm.c > > @@ -2532,6 +2532,8 @@ static int gsm_dlci_config(struct gsm_dlci *dlci, struct gsm_dlci_config *dc, in > > return -EINVAL; > > if (dc->k > 7) > > return -EINVAL; > > + if (dc->flags & ~GSM_FL_RESTART) /* allow future extensions */ > > + return -EINVAL; > > > > /* > > * See what is needed for reconfiguration > > @@ -2546,6 +2548,8 @@ static int gsm_dlci_config(struct gsm_dlci *dlci, struct gsm_dlci_config *dc, in > > /* Requires care */ > > if (dc->priority != dlci->prio) > > need_restart = true; > > + if (dc->flags & GSM_FL_RESTART) > > + need_restart = true; > > > > if ((open && gsm->wait_config) || need_restart) > > need_open = true; > > diff --git a/include/uapi/linux/gsmmux.h b/include/uapi/linux/gsmmux.h > > index eb67884e5f38..e56e2d7ea6eb 100644 > > --- a/include/uapi/linux/gsmmux.h > > +++ b/include/uapi/linux/gsmmux.h > > @@ -2,10 +2,22 @@ > > #ifndef _LINUX_GSMMUX_H > > #define _LINUX_GSMMUX_H > > > > +#include > > #include > > #include > > #include > > > > +/* > > + * flags definition for n_gsm > > + * > > + * Used by: > > + * struct gsm_dlci_config.flags > > + */ > > +/* Forces a DLCI reset if set. Otherwise, a DLCI reset is only done if > > + * incompatible settings were provided. Always cleared on retrieval. > > + */ > > +#define GSM_FL_RESTART _BITUL(0) > > + > > struct gsm_config > > { > > unsigned int adaption; > > @@ -58,7 +70,8 @@ struct gsm_dlci_config { > > __u32 priority; /* Priority (0 for default value) */ > > __u32 i; /* Frame type (1 = UIH, 2 = UI) */ > > __u32 k; /* Window size (0 for default value) */ > > - __u32 reserved[8]; /* For future use, must be initialized to zero */ > > + __u32 flags; /* DLCI specific flags. */ > > This should be called "dlci_flags" right? Otherwise when you add more > flags in the reserved area, what will you call them? Oh nevermind, the name of the structure has it there, this is fine, I'll take this... thanks, greg k-h