From patchwork Wed Sep 12 08:50:56 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guido Kiener X-Patchwork-Id: 10596977 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DFFA6921 for ; Wed, 12 Sep 2018 08:00:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D332A297DF for ; Wed, 12 Sep 2018 08:00:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C75D2297EC; Wed, 12 Sep 2018 08:00:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6F5CD297DF for ; Wed, 12 Sep 2018 08:00:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727662AbeILND6 (ORCPT ); Wed, 12 Sep 2018 09:03:58 -0400 Received: from mr01.mx01.tldhost.de ([62.108.36.247]:38036 "EHLO mr01.mx01.tldhost.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726818AbeILND6 (ORCPT ); Wed, 12 Sep 2018 09:03:58 -0400 X-Greylist: delayed 363 seconds by postgrey-1.27 at vger.kernel.org; Wed, 12 Sep 2018 09:03:57 EDT Received: from mx01.tldhost.de (localhost [127.0.0.1]) by mx01.tldhost.de (Postfix) with ESMTP id EC0C8120F74 for ; Wed, 12 Sep 2018 09:54:37 +0200 (CEST) Received: by mx01.tldhost.de (Postfix, from userid 1001) id D7DFD120F6E; Wed, 12 Sep 2018 09:54:37 +0200 (CEST) Received: from server12.tldhost.de (server12.tldhost.de [84.19.26.112]) by mx01.tldhost.de (Postfix) with ESMTPS id D01D3120F5B; Wed, 12 Sep 2018 09:54:35 +0200 (CEST) From: Guido Kiener To: gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, guido.kiener@rohde-schwarz.com, pankaj.adhikari@ni.com, steve_bayless@keysight.com, dpenkler@gmail.com Cc: Guido Kiener Subject: [PATCH v6 06/22] usb: usbtmc: Add ioctl USBTMC_IOCTL_CLEANUP_IO Date: Wed, 12 Sep 2018 10:50:56 +0200 Message-Id: <20180912085112.4891-7-guido@kiener-muenchen.de> In-Reply-To: <20180912085112.4891-1-guido@kiener-muenchen.de> References: <20180912085112.4891-1-guido@kiener-muenchen.de> X-PPP-Message-ID: <20180912075436.4684.69556@server12.tldhost.de> X-PPP-Vhost: kiener-muenchen.de X-POWERED-BY: TLDHost.de - AV:CLEAN SPAM:OK Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The ioctl USBTMC_IOCTL_CLEANUP_IO kills all submitted urbs to OUT and IN bulk, and clears all received data from IN bulk. Internal transfer counters and error states are reset. An application should use this ioctl after an asnychronous transfer was canceled and/or error handling has finished. Signed-off-by: Guido Kiener Reviewed-by: Steve Bayless --- drivers/usb/class/usbtmc.c | 19 +++++++++++++++++++ include/uapi/linux/usb/tmc.h | 1 + 2 files changed, 20 insertions(+) diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c index 0d8aa4bc3fa7..dc6c04fdfdff 100644 --- a/drivers/usb/class/usbtmc.c +++ b/drivers/usb/class/usbtmc.c @@ -1706,6 +1706,21 @@ static int usbtmc_ioctl_cancel_io(struct usbtmc_file_data *file_data) return 0; } +static int usbtmc_ioctl_cleanup_io(struct usbtmc_file_data *file_data) +{ + usb_kill_anchored_urbs(&file_data->submitted); + usb_scuttle_anchored_urbs(&file_data->in_anchor); + spin_lock_irq(&file_data->err_lock); + file_data->in_status = 0; + file_data->in_transfer_size = 0; + file_data->out_status = 0; + file_data->out_transfer_size = 0; + spin_unlock_irq(&file_data->err_lock); + + file_data->in_urbs_used = 0; + return 0; +} + static int get_capabilities(struct usbtmc_device_data *data) { struct device *dev = &data->usb_dev->dev; @@ -2130,6 +2145,10 @@ static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) case USBTMC_IOCTL_CANCEL_IO: retval = usbtmc_ioctl_cancel_io(file_data); break; + + case USBTMC_IOCTL_CLEANUP_IO: + retval = usbtmc_ioctl_cleanup_io(file_data); + break; } skip_io_on_zombie: diff --git a/include/uapi/linux/usb/tmc.h b/include/uapi/linux/usb/tmc.h index 42e275d1d385..5a69d9dc967d 100644 --- a/include/uapi/linux/usb/tmc.h +++ b/include/uapi/linux/usb/tmc.h @@ -99,6 +99,7 @@ struct usbtmc_message { /* Cancel and cleanup asynchronous calls */ #define USBTMC_IOCTL_CANCEL_IO _IO(USBTMC_IOC_NR, 35) +#define USBTMC_IOCTL_CLEANUP_IO _IO(USBTMC_IOC_NR, 36) /* Driver encoded usb488 capabilities */ #define USBTMC488_CAPABILITY_TRIGGER 1