From patchwork Thu Mar 4 15:24:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tetsuo Handa X-Patchwork-Id: 12116481 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 10088C4332B for ; Thu, 4 Mar 2021 15:27:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E676964FD8 for ; Thu, 4 Mar 2021 15:27:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234781AbhCDP0q (ORCPT ); Thu, 4 Mar 2021 10:26:46 -0500 Received: from www262.sakura.ne.jp ([202.181.97.72]:61975 "EHLO www262.sakura.ne.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234315AbhCDP0W (ORCPT ); Thu, 4 Mar 2021 10:26:22 -0500 Received: from fsav303.sakura.ne.jp (fsav303.sakura.ne.jp [153.120.85.134]) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTP id 124FP3oh030936; Fri, 5 Mar 2021 00:25:03 +0900 (JST) (envelope-from penguin-kernel@I-love.SAKURA.ne.jp) Received: from www262.sakura.ne.jp (202.181.97.72) by fsav303.sakura.ne.jp (F-Secure/fsigk_smtp/550/fsav303.sakura.ne.jp); Fri, 05 Mar 2021 00:25:03 +0900 (JST) X-Virus-Status: clean(F-Secure/fsigk_smtp/550/fsav303.sakura.ne.jp) Received: from localhost.localdomain (M106072142033.v4.enabler.ne.jp [106.72.142.33]) (authenticated bits=0) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTPSA id 124FOtn9030882 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Fri, 5 Mar 2021 00:25:02 +0900 (JST) (envelope-from penguin-kernel@I-love.SAKURA.ne.jp) From: Tetsuo Handa To: Valentina Manea , Shuah Khan , Greg Kroah-Hartman Cc: Arnd Bergmann , linux-usb@vger.kernel.org, Tetsuo Handa Subject: [PATCH v4 09/12] usb: usbip: vhci: add automatic recovery to attach_store() Date: Fri, 5 Mar 2021 00:24:52 +0900 Message-Id: <20210304152455.3685-10-penguin-kernel@I-love.SAKURA.ne.jp> X-Mailer: git-send-email 2.18.4 In-Reply-To: <20210304152455.3685-1-penguin-kernel@I-love.SAKURA.ne.jp> References: <20210304152455.3685-1-penguin-kernel@I-love.SAKURA.ne.jp> Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Handle kthread_create() failure by replacing kthread_get_run() with usbip_prepare_threads()/usbip_unprepare_threads(). Tested-by: syzbot Signed-off-by: Tetsuo Handa --- drivers/usb/usbip/vhci_sysfs.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) diff --git a/drivers/usb/usbip/vhci_sysfs.c b/drivers/usb/usbip/vhci_sysfs.c index 031e21aad96a..234a133f7333 100644 --- a/drivers/usb/usbip/vhci_sysfs.c +++ b/drivers/usb/usbip/vhci_sysfs.c @@ -314,7 +314,7 @@ static int valid_args(__u32 *pdev_nr, __u32 *rhport, static ssize_t __attach_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { - struct socket *socket; + struct usbip_thread_info uti; int sockfd = 0; __u32 port = 0, pdev_nr = 0, rhport = 0, devid = 0, speed = 0; struct usb_hcd *hcd; @@ -358,10 +358,10 @@ static ssize_t __attach_store(struct device *dev, struct device_attribute *attr, else vdev = &vhci->vhci_hcd_hs->vdev[rhport]; - /* Extract socket from fd. */ - socket = sockfd_lookup(sockfd, &err); - if (!socket) - return -EINVAL; + err = usbip_prepare_threads(&uti, &vdev->ud, sockfd, + vhci_tx_loop, "vhci_tx", vhci_rx_loop, "vhci_rx"); + if (err) + return err; /* now need lock until setting vdev status as used */ @@ -374,7 +374,7 @@ static ssize_t __attach_store(struct device *dev, struct device_attribute *attr, spin_unlock(&vdev->ud.lock); spin_unlock_irqrestore(&vhci->lock, flags); - sockfd_put(socket); + usbip_unprepare_threads(&uti); dev_err(dev, "port %d already used\n", rhport); /* @@ -392,7 +392,9 @@ static ssize_t __attach_store(struct device *dev, struct device_attribute *attr, vdev->devid = devid; vdev->speed = speed; vdev->ud.sockfd = sockfd; - vdev->ud.tcp_socket = socket; + vdev->ud.tcp_socket = uti.tcp_socket; + vdev->ud.tcp_rx = uti.tcp_rx; + vdev->ud.tcp_tx = uti.tcp_tx; vdev->ud.status = VDEV_ST_NOTASSIGNED; usbip_kcov_handle_init(&vdev->ud); @@ -400,8 +402,8 @@ static ssize_t __attach_store(struct device *dev, struct device_attribute *attr, spin_unlock_irqrestore(&vhci->lock, flags); /* end the lock */ - vdev->ud.tcp_rx = kthread_get_run(vhci_rx_loop, &vdev->ud, "vhci_rx"); - vdev->ud.tcp_tx = kthread_get_run(vhci_tx_loop, &vdev->ud, "vhci_tx"); + wake_up_process(vdev->ud.tcp_rx); + wake_up_process(vdev->ud.tcp_tx); rh_port_connect(vdev, speed);