From patchwork Tue Sep 22 11:21:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oliver Neukum X-Patchwork-Id: 258453 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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 4B307C4727F for ; Tue, 22 Sep 2020 11:21:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E4A07239D2 for ; Tue, 22 Sep 2020 11:21:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b="vEs3uoE4" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726577AbgIVLVz (ORCPT ); Tue, 22 Sep 2020 07:21:55 -0400 Received: from mx2.suse.de ([195.135.220.15]:37426 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726571AbgIVLVx (ORCPT ); Tue, 22 Sep 2020 07:21:53 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1600773711; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:in-reply-to:in-reply-to:references:references; bh=QHxctgCuNqwgEnaUO19yG0Cl1EVwRzPGYwo+m2GJyFc=; b=vEs3uoE45JluZQ9XBcgv8ZB8cpZqGePbvL1fBibNE9Eqjp4G+0Clr5H+zzhXfTgh02uFI2 bekIBcBSfNJJZ3P58fAVOCYFLkb9m3xTdmfVfDlWjDSWP0v0VZYB0dA4RwseeJNrSYknCH AnY3FuPo3Mq5oEYSEbRjVIgIaOVTvGc= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 454C4AE56; Tue, 22 Sep 2020 11:22:28 +0000 (UTC) From: Oliver Neukum To: penguin-kernel@i-love.sakura.ne.jp, bjorn@mork.no, linux-usb@vger.kernel.org Cc: Oliver Neukum Subject: [RFC 7/7] CDC-WDM: making flush() interruptible Date: Tue, 22 Sep 2020 13:21:26 +0200 Message-Id: <20200922112126.16919-8-oneukum@suse.com> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20200922112126.16919-1-oneukum@suse.com> References: <20200922112126.16919-1-oneukum@suse.com> Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org There is no need for flush() to be uninterruptible. close(2) is allowed to return -EINTR. 30 seconds is quite long a time to sleep in an uninterruptible state. Change it to an interruptible sleep. Reported-by: Tetsuo Handa Signed-off-by: Oliver Neukum --- drivers/usb/class/cdc-wdm.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c index 6ea03c12380c..b9cca1cb5058 100644 --- a/drivers/usb/class/cdc-wdm.c +++ b/drivers/usb/class/cdc-wdm.c @@ -622,7 +622,7 @@ static int wdm_flush(struct file *file, fl_owner_t id) struct wdm_device *desc = file->private_data; int rv; - rv = wait_event_timeout(desc->wait, + rv = wait_event_interruptible_timeout(desc->wait, /* * needs both flags. We cannot do with one * because resetting it would cause a race @@ -642,6 +642,8 @@ static int wdm_flush(struct file *file, fl_owner_t id) return -ENODEV; if (!rv) return -EIO; + if (rv < 0) + return -EINTR; spin_lock_irq(&desc->iuspin); rv = desc->werr;